Cummins n14 manual download. CUMMINS N14 Shop Manual

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

See the latest N14 parts publi- cation information. Install a dial indicator, Part No. Use the adapter, Part No. Page Jacobs Brake Engine Assembly Rocker Housing Covers – Installation Page Tighten the slave piston adjusting screw until the slave piston contacts the feeler gauge and creates a slight drag. Use the torque wrench adapter, Part No. ST, to tighten the lock nut. Install the ten capscrews and washers in each cover. Tighten the capscrews in each cover in the sequence shown.

Tighten the sensor. Use clean vegetable oil to lubricate the o-ring. Loosely install the lubricating oil transfer tube assembly with the lubricating oil pump mounting flange, new seal- ing ring, new gasket, and the mounting capscrews to the oil pan and lubricating oil pump. Make sure the gasket surfaces of the accessory drive and the air compressor are clean and not damaged. It is not necessary to time the air compressor on the NT engine.

Use a new gasket to install the fuel pump. Install the four fuel pump mounting capscrews. Inspect for paint or grease on the cooling plate. Install the sensor harness amp connector to the elec- tronic control module ECM. Tighten the connector cap- screws to the ECM.

Wire tie the harness to the fuel tubing at the rear of the engine. Install a new plastic wire tie, Part No. Fuel pressure sensing line – 9. Page Vibration Damper – Installation Engine Assembly Page Install the dial indicator on the gear cover as indicated to measure damper eccentricity.

Rotate the crankshaft, and record the indicator move- ment. Replace the vibration damper if the eccentricity exceeds 0. Page Water Pump – Installation Engine Assembly Water Pump – Installation Page Rotate the crankshaft degrees, maintaining the po- sition of the crankshaft either toward the front or the rear in relation to the block. Record the total indicator motion. Replace the damper if wobble exceeds 0. Pulley misalign- ment must not exceed 0.

Inspect and repair or replace the idler pulley or water pump if pulley misalignment exceeds 0. Apply a non-petroleum based lu- bricant such as soap or vegetable oil to the o-rings on each end of the tube and to the bores in the water pump housing and the thermostat housing cover. Install the coolant tube to the thermostat housing. Inspect, repair, or replace the fan hub or the fan hub support bracket if pulley misalignment exceeds 0. Remove the capscrews that hold the engine to the adapter plate.

Water Header Covers – Installation Install new water header cover gaskets and the covers. Install a new oil cooler support gasket over the guide studs. Tighten the mount- ing capscrews.

Special capscrews with spacers are required for the N14 exhaust manifold. Do not use short capscrews. Page Turbocharger – Installation Engine Assembly Turbocharger – Installation Page Tighten the capscrews in two steps in the sequence shown. Page Turbocharger – Installation Engine Assembly Page Install a new gasket, oil drain tube, and capscrews.

If installing a new turbocharger, install the male union elbow. Torque Value: 4. Open the valve after the run-in. Be sure the engine draincock and oil cooler draincock are closed.

ST Loctite Primer T Use to clean the counterbore area and the outside diameter of the repair sleeve. ST Pipe Sealant Use when installing pipe plugs on engines to stop leaks. Page Cylinder Block – General Information 2. Most of the capscrews used on the N14 engine are U. Drill a 3. Page Dowel Pin – Removal Cylinder Block – Disassembly Cylinder Block Page Remove the straight thread plug and pipe plug from the piston cooling oil passage on the exhaust side of the cylinder block.

Remove pipe plugs from the coolant passage on the exhaust side of the cylinder block. Remove the No. Page Cylinder Block – Cleaning and Inspection Cylinder Block Page Clean the following cylinder block areas: Cylinder liner counterbore ledge and press fit area. Cylinder liner packing ring bore. Cylinder head deck surface. Main bearing saddles and caps. All gasket surfaces. All component mounting surfaces. Clean all oil passages. Use a bottle brush with a long handle. Page Follow the instructions of the manufacturer of the clean- ing tank and the manufacturer of the cleaning solution.

Cover the block to prevent dirt from sticking to the oil. Camshaft Bore – Cleaning Use a fine emery cloth to remove burrs, and clean the bushing bores. ST [4. Put the rings in the No. Use clean 15W oil to lubricate the main bearing cap- screw threads and the flat washers.

Hit the cap with a rubber mallet to push it into the correct position. NOTE: The main bearing caps must not have any side clearance with the block. Page Cylinder Block – Cleaning and Inspection Cylinder Block Page Insert the bar through the centering rings while slowly rotating the bar.

The bar must turn easily. If the bar does not turn easily, check to make sure the main bearing caps are installed correctly.

Center the checking ring in the bore. Try to put the feeler gauge between the checking ring and the bore. Rotate the gauge in the bore at both sides of the checking ring. The inside diameter must be completely round within 0. Main Bearing Bore I. Capscrews Torqued to Specification Page Coolant Passage – Inspection NOTE: If the top surface of the block is machined, the ledge depth of the cylinder liner counterbore must be machined.

Page Cylinder Block – Machining Cylinder Block Page Closed end thread repair inserts can be used in conjunc- tion with upper counterbore sleeves 0. Cylinder blocks with vertical cracks that extend down over the counterbore ledge that can not be machined out using a 0.

The coolant passage repair inserts for the N14 cylinder block are available in packages of 50, tool Part No. NOTE: If the reamer extends too far down in the hole, it will hit the radius of the coolant jacket and deflect the drill side- ways, causing the hole to be out of round. Clean the threads with safety solvent, Part No.

Allow to dry. Clean the coolant passage insert with a safety solvent, Part No. Page Cylinder Block Cylinder Block – Machining Page Start the insert with your fingers, and install it approxi- mately half way. Liberally apply the sealing and retaining compound to the upper half of the thread, and finish installing with the installation tool.

Tool No. Description Insert Use a chip removing unit to remove reamer chips from the capscrew hole. Set the tap stop collar to the correct height, using the insert to be installed. Use a chip removing unit to clean the capscrew hole of shavings and debris, and allow to dry.

Loosen the jam nut. Remove the cylinder head capscrew and jam nut arrangement. Correct installation will provide 0. Bushing No. To use, mount the bearing on the driver. Place the align- ment pointer against the machined side of the block at the cam follower holes with the end of the rod at the top of the bearing. The rod must pass through the oil holes in the bushing and into the oil supply drillings in the cylinder block. Install new o-rings on the straight thread plugs.

The o-ring used by Cummins Engine Company, Inc. Lubricate the o-ring with clean 15W oil. Tighten the pipe plug. This will prevent dirt from being trapped in the engine. Abrasives can damage the finish and the pattern and can contaminate the liner. Warning: Wear eye protection. Make sure the wire brush is rated for the RPM being used if the brush is motor driven. Replace the liner if pitting or erosion is greater than one-half the width of the crevice seal groove. Visually inspect the outside diameter for excessive cor- rosion or pitting.

NOTE: Cracks can also be detected by using either mag- netic inspection or the dye method. Replace the liner if cracks are found in the flange area. Visually inspect the exterior of the liners. Hot steam can cause serious personal injury. Page Inspection If pistons are unacceptable for reuse, do not use the mating piston pins. Cummins recommends replacing pistons and pins in sets. Visually inspect the piston ring lands and ring grooves for wear. Piston Pin Bore Page Inspection Connecting Rod Assemblies – Cleaning and Inspection Cylinder Block Page Inspection Visually inspect the connecting rod and the cap for fret- ting damage on the mating surfaces.

The rod and the cap must be replaced as an assembly if any fretting damage is visible on either piece. Visually inspect under the capscrew heads for cracks. Measure the capscrew outside diameters. Connecting Rod Capscrew O. Connecting Rod Crankshaft Bore I. Use pliers or locking pliers to remove the damaged ring dowels. Move the dial holder to position the contact points of the indicators on the mandrel in the piston pin bore.

Tighten the bracket to hold the indicators in position. Connecting Rod Length Page Connecting Rod Bearings – Cleaning and Inspection Cylinder Block Page NOTE: If large areas of copper lining are visible in the bear- ings before the engine has accumulated , kilometers [, miles] or 3, hours, inspect the engine for con- tamination from fine dirt particles; Also, the wire brush must be rated for the RPM being used if the brush is motor driven.

Use an emery cloth or a steel wire brush. Outside Pilot Diameter Spun Steel Crankshaft Pulley I. Personal injury can result. ST, and solvent to clean all the oil drillings. Warning: When using a steam cleaner, wear protective clothing and safety glasses or a face shield. Visually inspect the crankshaft gear for cracks and broken or chipped teeth.

Where the front and the rear crankshaft seals contact the crankshaft, the maximum allowable wear is 0. Crankshaft Main Bearing Journal O. Crankshaft Thrust Face Width Install the puller jaw and the bridge assembly. Use engine oil to lubricate the puller jackscrew. Page Crankshaft Gear – Replacement Cylinder Block Page Visually inspect the crankshaft gear fit area for burrs or damage. Use a fine crocus cloth to remove the burrs.

Inspection Visually inspect the crankshaft gear for cracks and broken or chipped teeth. Visually inspect the gear and the keyway for nicks or burrs. Crankshaft Gear Fit Area O. Use Lubriplate No. Caution: The timing mark 1 and the part number 2 on the gear must be facing away from the crankshaft after the gear is installed. Bearing shells are identified by steel stamped characters on the back of the bearings to indicate either standard or the amount of oversize.

Page 40 oil before handling. Inspection Visually inspect the valve and injector lobes for damage. If the camshaft is damaged, it must be replaced. Camshaft Bushing Journal O. Measure the camshaft thrust washer. Camshaft Thrust Washer Thickness 2. If you use a heating torch, a new gear must be installed.

Push the shaft from the gear. NOTE: If the camshaft key is marked with an arrow, record the direction the arrow on the key is pointed toward or away from the camshaft for future reference. Camshaft Gear Bore I.

Flangeless Caution: If the area of fretting is longer than a 3. Remove the gear from the oven. Caution: The aluminum gasket surface can be easily damaged if caution is not used when removing gasket material. An oil leak will result. Use a gasket scraper to remove all gasket material. Accessory Drive Seal Bore I. Measure the crankshaft seal bore. Accessory Drive Bushing Bore I.

Use gear cover bushing mandrel, Part No. Use solvent to clean the rear cover. Dry with compressed air. Inspection Inspect the rear cover for cracks or other damage. Measure the rear cover crankshaft seal bore. ST Injector Sleeve Expander Roll and seal the upper portion of the injector sleeve in the cylinder head. Tool Description Tool Illustration Injector Sleeve Holding Tool Hold the injector sleeve in place when rolling the upper portion of the sleeve and testing the cylinder head.

Page Cylinder Head – General Information Cylinder Head Cylinder Head – General Information Page Cylinder Head – General Information The cylinder head group consists of the cylinder head, valves, valve guides, valve springs, stem seals, valve seat inserts, cylinder head capscrews, fuel crossover, collets, spring retainer, crossheads, and the injector sleeves.

The exhaust valves are manufactured from a material that is capable of operating at a higher temperature than the intake valves. Blow out all capscrew holes, fuel passages, and oil passages.

Inspection Visually inspect the fuel drillings and the water passages for restrictions or foreign material. Remove any obstructions. Visually inspect the valves and the valve springs for cracks, bent or broken valve stems, broken valve springs, or other damage.

Visually inspect the valves for indications of leakage or burning. Discard the valve collets. Slowly release the pressure on the valve spring. Remove the valve spring retainer.

Remove the valve spring s. Remove the valve stem seal. Remove the valves. Install the cylinder head and the parts in a tank of clean- ing solution. Remove the cylinder head and parts from the cleaning tank. Flatness Per Limit NOTE: Install the valve on the tool with the valve head contacting the tool as shown. If the valve head is even with, or extends beyond the end of the tool, the valve can be reground. Valve Seat Area Width 1. Page Grinding The Valve Seats Cylinder Head Cylinder Head – Rebuild Page Remove the injectors from the cylinder head and check the pattern of the blueing compound in the injector sleeve.

The blueing pattern in the injector seating area 1 must be visible degrees around the seating area. The injector bore seating width 2 must be a minimum of 1. Page Cylinder Head – Rebuild Cylinder Head Page Hold the drive unit in a vertical position, and use an up-and-down movement of Remove the grinder unit from the arbor. Install eccentrimeter gauge 4 , Part No.

Page Cylinder Head Cylinder Head – Rebuild Page If the valve protrusion is out of limits, replace the old valve A with a new valve B before replacing the valve seat. If the protrusion is within limits with the new valve, pro- ceed using the new valve with the old seat.

Page Cylinder Head – Rebuild Cylinder Head Page Remove the valve, and measure the valve seat width and the seat contact area as indicated by the broken lines. The pencil or Dykem marks will be worn away where the valve contacted the seat.

Page Cylinder Head Cylinder Head – Rebuild Page After grinding the valve seats, use a bristle brush to clean the inside diameter of the valve guides. Use solvent to clean the cylinder head. Dry with com- pressed air. Assembly Apply cup plug sealant, Part No. ST, or its equivalent refer to the Service Tools list to compress the valve springs. Install the new valve spring retainer collets. NOTE: Use new valve spring retainer collets when rebuilding the cylinder head. Page Cylinder Head Cylinder Head – Rebuild Page Visually inspect the cylinder head capscrews for dam- aged threads, corroded surfaces, or a reduced diameter due to capscrew stretching.

NOTE: Do not reuse a capscrew that has damaged threads or a reduced diameter from having been stretched. Page Cylinder Head Cylinder Head – Replacing the Valve Guides Page Immediately after cleaning and inspecting, apply a film of clean engine lubricating oil to capscrews that are to be used again.

Valve Guide O. The 0. Use a pliers or a locking pliers to remove the damaged ring dowel. NOTE: If cracks or damage are found, it is possible to repair the cylinder head by machining the insert bore for oversize valve seat inserts.

ST, and valve guide arbor set, Part No. ST, to grind the new valve seat inserts. NOTE: If the valve head is below the end of the tool, the valve must be replaced. ST, to remove the injector sleeves from the cylinder head. Install the puller in the injector sleeve with the legs of the bridge against the cylinder head.

ST; holder, Part No. ST; and cutting tool, Part No. ST, to machine the grooves steps in the bottom of the injector bore. ST, to expand the upper section of the injector sleeve. Adjust the expander roller edge 1 and the collar 2 to the clearance specified. Page Cylinder Head – Replacing the Injector Sleeves Cylinder Head Page Caution: Support the cylinder head to prevent damage to the injector tip that protrudes from the combustion face.

Apply a very light film of blueing compound to the outside diameter of the injector at the injector seat area. NOTE: If the injector protrusion is more than the maximum specified or if the injector sleeve blueing pattern does not meet the specifications given, the injector sleeve s must be ST, and a hydrostatic tester adapter plate, Part No.

Dry the cylinder head with compressed air. Assemble the cylinder head. Valve B. Valve Stem Seal C. Use compressed air regulated to kPa [30 psi] to remove excess powder from the area.

The powder will remain if there are any cracks and will appear as a white line. NOTE: The valves and the valve seats must be clean and dry when vacuum testing. Start timing when the needle on the gauge indicates mm-Hg [18 in. Stop timing when the needle on the gauge indicates mm Hg [8 in. The elapsed time for the needle to move between the specified gauge readings must be 10 seconds or more.

Inspection Visually inspect the rocker lever contact pad for wear, cracks, or damage. Description Qty. The rocker levers contain replaceable bushings. Turn the adjusting screws counterclockwise until the rocker levers are loose. Light fretting is typically found on the underside of the shaft and is not harmful, provided it meets the dimen- sional specifications. Rocker Lever Bushing I.

Installed Install the adjusting screw and lock nut in each rocker lever. Do not tighten the lock nuts. Install the exhaust 1 , injector 2 , and intake 3 rocker levers onto the shaft. Adjust the valves and injectors. Rocker Lever Bushing – Replacement Page Rocker Lever Housing Assembly Rocker Lever Bushing – Replacement Page Use a grit, or finer, emery cloth to remove any rough edges or burrs from the bore of the rocker lever.

Use solvent to clean the rocker levers. Page Cleaning Remove the crankcase breather element, if used, and the oil filler cap. Steam clean the covers, and dry with compressed air. Dry with compressed air, and check for cuts or deformations in the silicone bead. Replace the gasket if there are any cuts, abrasions, or deformations in the silicone bead.

Page Visually inspect the o-ring plugs and water tubes for cracks, pitting, corrosion, or other damage. Replace if necessary. Page Page Visually inspect the pass through connectors for cracks, bent contacts, or other damage. On STC engines, remove the oil manifold. NOTE: When removing the oil manifold connector from the rocker lever housing, use a wide flat pry bar. Clean the oil manifold connector, external oil manifold, and internal oil tube.

Inspect the oil manifold connector for cracks, damage, or restrictions. Tighten the hexagon nut until snug. Installation Caution: Do not use a hammer or damage to the dowel will result.

Remove the capscrew. Cut and remove the plastic wire tie that holds the actuator harness to the pass through connector. Reference No. Page Cam Follower Assembly – General Information The cam follower group consists of the injector cam followers, valve cam followers, cam follower shafts, cam follower housing, and the valve and injector push rods.

The N14 uses the crowned roller design cam follower. This design has been used since November, Roller Side Clearance 0. NOTE: Each cam follower housing assembly consists of two shaft assemblies secured in a common center support with two locking screws.

Roller to Pin Clearance 0. Clean the cam follower shafts with solvent. Make sure the oil drillings are not restricted or plugged. Visually inspect the cam follower shafts for scoring or damage. Visually inspect the cam follower housings for cracks or damage.

Visually inspect the locking screw holes for damaged or distorted threads. NOTE: To prevent increased wear, install the cam follower levers and the shafts back in their original location in the housing. Caution: Use the largest feeler gauge that will fit be- tween the roller and the lever to prevent leg deflection when removing the roller pin. Valve Lever Roller Bore I. Inspect the new roller pin as shown to determine the oil feed pass 1 and the alignment hole 2 locations.

Page Cam Follower Lever – Roller Replacement Cam Follower Assembly Page Caution: The cam follower roller pin must be installed with the oil feed hole 1 positioned towards the top of the cam follower lever 2.

NOTE: Freezing the roller pin will simplify its installation. Use clean 15W oil to lubricate the roller pin. The N14 valve and injector cam follower socket has an identification groove around the outside diameter and two marks degrees apart on top of the socket. An old roller can be used to support the lever. Use a brass drift or a used push rod end 2. Use an arbor press. Page Cam Follower Assembly Push Rod – Cleaning and Inspection for Reuse Page Visually inspect the socket end of the push rod for uneven wear, scratches, or separation of the insert from the tube.

If a worn push rod is found, the mating adjusting screw must also be replaced. Visually inspect the front cover pilot to make sure the pilot is continuous without cracks or gaps. Use clean 15W oil to lubricate the tachometer drive gear. By using the CPL number stamped on the engine dataplate and this manual, parts within the engine can be identified.

Description Quantity Reference No. The injector top stop plunger travel and total travel must be adjusted with a top stop injector setting fixture before installing them into an engine.

Cleaning – STC Use a clean, lint-free cloth to clean the exterior of the injectors. Visually inspect the o-ring grooves for damage.

Visually inspect the injector body and cup retainer for cracks or other damage. Page Lubricating Oil System – General Information Lubricating Oil System Lubricating Oil System – General Information Page Lubricating Oil System – General Information The lubricating oil system group consists of the oil pan, the oil suction tube, the oil transfer tube assembly, the oil dipstick and oil gauge tube, the oil filter and cooler assembly, and the lubricating oil pump.

Service replacement dipsticks do not have the high and low level marks indicated on the dipstick. Warning: When using a steam cleaner, wear protec- tive clothing and safety glasses or a face shield. Inspection Visually inspect the tube and the flanges for cracks, cor- rosion, or other damage.

NOTE: Cut the new dipstick off approximately 38 mm [1. Visually inspect the gears for cracked or broken teeth. Visually inspect the bushings for excessive wear or dis- coloration due to overheating or seizure of the shafts. Remove and discard the cover gasket.

Remove the high oil pressure relief valve as follows: 1. Use solvent to clean the lubricating oil pump parts. Use an acetylene torch tip cleaner or its equivalent that is 1. Measure the inside diameter of the bushings in the oil pump body and cover. Bushing I. Page Lubricating Oil System Lubricating Oil Pump – Rebuild Page Measure the outside diameter of the drive and the driven shafts in the bushing contact area.

Shaft O. NOTE: Compress the spring to a height of Support the end of the drive shaft, and press the main drive gear onto the shaft. NOTE: At this stage of assembly, there must not be more than 0. Page Lubricating Oil Pump – Rebuild Lubricating Oil System Page Install the spring 4 , the washer 3 , the valve disc 2 , and the retainer plug 1 into the bore of the locating plate. NOTE: Make sure the prongs on the disc are down toward the washer and that the cup side of the retainer plug is up toward the mandrel.

Lubricate the o-rings with vegeta- ble oil. Install the plunger 4 , the spring 3 , the retainer plug 2 , and the capscrew 1. ST, to push the new bushings into the oil pump body and cover.

NOTE: The bushings must be installed level with or no more than 0. NOTE: Adjust the tool bit until the indicator is set to the same size as the setting standard.

NOTE: Do not push down on the drill motor. The feed mechanism in the boring tool will move the boring bar. NOTE: The tool bit must go through the slot in the guide bushing. Do not allow the tool bit to hit against the guide bushing. Stop the drill motor when the stop collar on the drive shaft is against the body of the boring tool. New Use spacer mandrel, Part No. ST, and an arbor press to push the drive gear onto the drive shaft. If the spacer mandrel is not available, install the gear onto the shaft to the following dimension as measured from the end of the shaft.

ST, to install the driven shaft into the oil pump body as follows: 1. Lubricate the large outside diameter of the driven shaft with clean 15W oil. Remove the oil cooler core from the oil cooler transfer connection housing by pulling the oil cooler water trans- fer tubes out of the o-ring adapters. Remove the four adapter plate capscrews and the o-ring adapters. Remove the retaining plug 1 , the plunger 2 , spring 3 , and the poppet valve 4 from the lubricating oil cooler transfer housing 5.

Remove the transfer housing support bracket. Cleaning Clean the gasket material from the oil cooler core, trans- fer housing, support, spacer plate and filter head. Page Lubricating Oil Cooler Assembly – Rebuild Lubricating Oil System Page Visually inspect the oil cooler support, housing, spacer plate, filter head, and support bracket for cracks or damage. Visually inspect the oil cooler bypass valve for damage. Any damage to the front face of the valve will allow oil to bypass the oil cooler.

Replace the o-ring if damaged. Inspect the teflon o-ring on the poppet valve for wear, cuts, or tears. Replace the complete poppet valve if there is any damage.

Caution: Conduct this test with extreme caution. Pres- surization of the oil cooler assembly while submerged in a hot water bath poses a condition where one must exercise care to avoid burns and water splash.

Do not allow the valve or the thermometer to touch the sides or bottom of the container. Place the spacer plate and a new spacer gasket on the oil cooler support. Use two of the connection retainer capscrews to keep the gasket and plate loosely aligned on the support.

Page Lubricating Oil System Lubricating Oil Cooler Assembly – Rebuild Page Install the oil cooler core on the oil cooler transfer con- nection housing by inserting the transfer tubes into the o-ring adapters. NOTE: Make sure the o-ring adapters move freely when the transfer tubes are inserted as this will allow tubes to be centered in the adapters.

Install the retaining capscrew and washer. Page Cooling System – Service Tools Page Cooling System – Service Tools The following special tools are recommended to perform procedures in section 8. Tool Description Page The bearing is greased during assembly and a press-on cover and o-ring are used to seal the unit from dirt. The N14 water pump is different from past NT engine water pumps in that it incorporates an internal coolant return passage from the oil cooler. A small amount is normal, but rebuild or replace the pump if a large amount is caked around the weephole.

Remove the impeller with puller, Part No. Remove the retaining ring that holds the bearing assem- bly and shaft in the body. Push the shaft from the bearing. Discard the bearing. Cleaning Use a gasket scraper to remove the gasket material from the gasket sealing surfaces. Use Scotch-Brite , Part No. NOTE: If the part being inspected does not meet the spec- ification given or if it is damaged or no alternative is given, the part must be replaced.

Impeller Bore I. Visually inspect the pulley grooves and the oil seal wear sleeve for wear or damage. Point Discard damaged parts. Assembly Use clean 15W oil to lubricate the water pump shaft.

ST, to support a new outer bearing. Install the shaft and the spacer into the bearing. NOTE: Push the shaft through the bearing until the bearing is against the spacer. Page Cooling System Water Pump Assembly – Rebuild Page Install a new outside oil seal, using a mandrel to press the seal in flush with the housing.

Apply a thin film of pipe sealant, Part No. Apply a light film of Locktite , Part No. Support the water pump pulley in an arbor press. Turn the idler pulley by hand to inspect the shaft and the bearing for freedom of rotation. NOTE: If damaged parts are found or the idler assembly does not rotate freely, the idler assembly must be replaced or rebuilt.

Press the shaft out of the bearing. Cleaning Use solvent to clean the idler assembly parts. Inspection Visually inspect the idler pulley for cracks or damage.

Inspect the adjusting screw and the mounting nut threads for wear or distortion. Measure the outside diameter 1 of the bearing press fit area of the idler shaft. Use bearing installation tool, Part No.

ST, to press the bearing into the pulley until the bearing is against the bottom of the bearing bore. Use seal expander, Part No. Use a tube mandrel to press the seal in flush with the pulley. Page Cleaning Thermostat Housing – Cleaning and Inspection Cooling System Page Carefully remove the thermostat seal to avoid damaging the thermostat cover. Cleaning Use a gasket scraper to remove the gasket material from the mating surfaces of the housing and the cover.

Page Cooling System Thermostat Housing – Cleaning and Inspection Page Inspect the thermostat seal and the thermostat cover gasket surface for cracks, corrosion, or damage. Replace the thermostat cover if necessary. The thermostat seal can not be reused. The seal must be replaced if it is removed from the cover. Page Thermostat Housing – Cleaning and Inspection Cooling System Page Measure the inside diameter of the thermostat seal count- erbore in the thermostat housing.

Thermostat Seal Bore I. The cost of the rebuild will be reduced more than the cost of the additional inspection time. The assembly instructions have been written to reuse as many components and assemblies as possible. When it is necessary to replace a component or assembly, the procedure is based on the use of new Cummins or Cummins ReConW components. All of the repair services described in this manual are available from all Cummins Distributors and most Dealer locations.

Complete troubleshooting and repair instructions are available in the Troubleshooting and Repair Manual which can be ordered or purchased from a Cummins Authorized Repair Location. Refer to Section L, Literature, for ordering instructions. This list contains the general safety precautions that must be followed to provide personal safety. Special safety precautions are included in the procedures when they apply.

Be aware of hazardous conditions that can exist. Remove all jewelry when working. Disconnect the air starting motor if equipped to prevent accidental engine starting.

Do not attempt to rotate the engine by pulling or prying on the fan. This practice can cause serious personal injury, property damage, or damage to the fan blade s causing premature fan failure. Always use blocks or proper stands to support the product before performing any service work. Be alert for possible pressure when disconnecting any device from a system that utilizes pressure. Do not check for pressure leaks with your hand.

High pressure oil or fuel can cause personal injury. Make sure all lifting devices such as chains, hooks, or slings are in good condition and are of the correct capacity. Make sure hooks are positioned correctly. Always use a spreader bar when necessary. The lifting hooks must not be side-loaded. Do not get the substance in your eyes. Avoid prolonged or repeated contact with skin. Do not swallow internally. In case of contact, immediately wash skin with soap and water.

In case of contact, immediately flood eyes with large amounts of water for a minimum of 15 minutes. Make sure you understand how to use them before performing any service work. Do not use a fastener of lessor quality if replacements are necessary.

Symbols Used in this Manual The following group of symbols has been used in this manual to help communicate the intent of the instructions. When one of the symbols appears, it conveys the meaning defined below. CAUTION – Minor personal injury can result or a part, an assembly or the engine can be damaged if the caution instructions are not followed. CLEAN the part or assembly. Refer to another location in this manual or another publication for additional information.

The component weighs 23 kg [50 lb] or more. To avoid personal injury, use a hoist or get assistance to lift the component. El componente pesa 23 kg [50 lb] o mas. Para evitar dano corporal empleen una cabria u obtengan ayuda para elevar el componente. Le composant pese 23 kg [50 lb] ou davantage. Symbole In diesem Handbuch werden die folgenden Symbole verwendet, die wesentliche Funktionen hervorheben. Weitere Informationen an anderer Stelle bzw. Das teil weigt 23 kg [50 lb] oder mehr.

Zur vermeidung von koerperverletzung winde benutzen oder hilfe beim heben des teils in anspruch nehmen. Illustrations The illustrations used in this manual are intended to give an example of how to perform the action or the repair being described. Many of the illustrations are common and will not look exactly like the engine or the parts used in your application. Most of the illustrations contain symbols to indicate an action required or to indicate an acceptable OK or unacceptable not OK condition.

Air Fuel Control; a device in the PT fuel pump that limits the fuel delivery until there is sufficient intake manifold pressure to allow for complete combustion.

After Top Dead Center; refers to the position of the piston or the crankshaft rod journal. The piston is moving downward on the power stroke and intake stroke. Bottom Dead Center; refers to the position of the piston or the crankshaft rod journal. The piston is at its lowest position in the cylinder. Before Top Dead Center; refers to the position of the piston or the crankshaft rod journal. The piston is moving upward on the compression stroke and exhaust stroke. A measurement of the difference between the centers of either two or more parts or the bores in one part.

Control Parts List; this listing identifies the specific parts that must be installed on the engine to meet agency certification. This is a one part Room Temperature Vulcanizing RTV silicone rubber, adhesive and sealant material having high heat and oil resistance, and low compression set. A method used to check for cracks in a part by using a dye penetrant and a developer.

Use crack detection kit, Part No. The clearance in an assembly determined by pushing the shaft in an axial direction one way and then pushing the shaft the other way. A single component, anaerobic, polyester resin, liquid sealant compound that hardens between closely fitted metal surfaces producing a tough, hard bond with good characteristics. An equivalent product is Perma-Lok HL Some of the equivalent products are Loctite and Permabond HL A mineral oil base grease with calcium soap 2 percent to 6 percent , and zinc oxide 2 percent to 4 percent additives.

A method of checking for cracks in either steel or iron parts. This method requires a Magnaflux machine, or an equivalent machine that imparts a magnetic field on the part being checked.

A hand tool consisting of a soft head, either wood, plastic, lead, brass, or rawhide, on a handle. Top Dead Center; refers to the position of the piston or the crankshaft rod journal. The piston is at its highest position in the cylinder. The rod journal is pointing straight up toward the piston. Total Indicator Runout; used when measuring the concentricity or the runout. The T. Some of the greases meeting this requirement are Aeroshell No.

Aeroshell No. Engine Identification The engine dataplate provides the model identification and other important information about the engine. Have the following engine data available when communicating with a Cummins Authorized Repair Location. The information on the dataplate is mandatory when sourcing service parts: 1. Engine Serial Number E. Model 4. Advertised Horsepower and RPM ap8plgi.

Engine Diagrams The following drawings contain information about engine components, filter locations, drain points, and access locations for instrumentation and engine controls. The information and configuration of components shown in these drawings are of a general nature. Some component locations will vary depending on applications and installations. General Cleaning Instructions Solvent and Acid Cleaning Several solvent and acid-type cleaners can be used to clean the engine parts.

Experience has shown that the best results can be obtained using a cleaner that can be heated to 90 to 95 degrees Celsius [ to degrees Fahrenheit]. A cleaning tank that provides a constant mixing and filtering of the cleaning solution will give the best results. Remove all the gasket material, o-rings, and the deposits of sludge, carbon, etc. Be careful not to damage any gasket surfaces.

When possible, steam clean the parts before putting them in the cleaning tank. Warning: The use of acid can be extremely dangerous to personnel, and can damage the machinery. Always provide a tank of strong soda water as a neutralizing agent. Rinse all of the parts in hot water after cleaning. Dry completely with compressed air. Blow the rinse water from all of the capscrew holes and the oil drillings. If the parts are not to be used immediately after cleaning, dip them in a suitable rustproofing compound.

The rustproofing compound must be removed from the parts before installation on the engine. Steam Cleaning Steam cleaning can be used to remove all types of dirt that can contaminate the cleaning tank.

It is the recommended way to clean the oil drillings. Warning: Wear protective clothing to prevent personal injury from the high pressure and extreme heat. Do not steam clean the following parts: 1. Electrical Components 2. Wiring 3. Injectors 4. Fuel Pump 5. Belts and Hoses 6. Glass or Plastic Bead Cleaning Glass or plastic bead cleaning can be used on many engine components to remove carbon deposits.

The cleaning process is controlled by the size of the glass or plastic beads, the operating pressure, and the cleaning time. Caution: Do not use glass or plastic bead cleaning on aluminum piston skirts. Do not use glass bead cleaning on aluminum ring grooves. Small particles of glass or plastic will embed in the aluminum and result in premature wear. Valves, turbocharger shafts, etc. Follow the cleaning directions listed in the procedures.

Do not use any bead blasting media on pin bores or aluminum skirts. Use U. Steam clean or wash the parts with solvent to remove all of the foreign material and glass or plastic beads after cleaning. Rinse with hot water. Dry with compressed air. C-Brake – Alternate Method Jacobs Brake Engine Brake – Installation Fan and Fan Spacer – Removal Lubricating Oil Transfer Tube – Installation The following special tools are recommended to perform procedures in section 1. The use of these tools is shown in the appropriate procedure.

These tools can be purchased from your local Cummins Authorized Repair Location. Use to drive the crankshaft oil seal into the rear cover. This tool also aligns the rear cover to the crankshaft. Use to pull or install the front crankshaft oil seal. Use with dial gauge attachment, Part No. ST, to measure flywheel and flywheel housing runout. Required to make consistent settings of the top stop injectors. Screwdriver socket, Part No.

ST, must be used with this tool. The differences between engine models due to the application, the optional equipment on an engine, and the year an engine was built are included in the instructions. Omit the steps that do not apply to the engine being rebuilt. A warning statement is included for any component or assembly that weighs more than 23 kg [50 lb]. To avoid personal injury, use a hoist or get assistance from more than one person when removing or installing these parts.

All capscrews used on the N14 engine are U. Disassembly The instructions in this procedure are organized in a logical sequence to disassemble an engine. This is not the only sequence to disassemble an engine. Certain parts must be removed in the sequence indicated.

Use this sequence until you become familiar with the engine. Discard all gaskets except rocker housing cover gaskets which are reusable , seals, hoses, filters, and o-rings. Keep these parts if they are needed for a failure analysis. Label, tag, or mark the parts for location as the parts are removed in order to easily find all of the parts that can be involved in a failure and to simplify the assembly procedure.

Label, tag, mark or photograph all special equipment prior to the removal from an engine. This engine assembly procedure does not include the installation of special optional equipment. Force must be used to remove certain parts. A mallet must be used when force is required. All of the fasteners must be removed before using force. Avoid as much dirt as possible during disassembly. The accumulation of additional dirt will make it more difficult to clean the components.

Assembly Make sure all the components and assemblies have been cleaned, replaced or rebuilt, and are ready to be installed on the engine before beginning the assembly process. Torque values are listed in each step. If a torque value is not specified, use the chart listed in Specifications, Group 18, to determine the correct torque value.

Many of the gaskets and the o-rings are manufactured from a material designed to absorb oil. These gaskets will enlarge and provide a tight seal after coming in contact with oil. Use ONLY a recommended contact adhesive or a vegetable-based oil to install these parts. Always use a capscrew of the same system metric or U. The use of a longer, shorter, different grade, or wrong thread capscrew than the capscrew that is listed can result in damage to the engine. Engine Disassembly Engine – Preparation for Cleaning Warning: The engine lifting equipment must be designed to safely lift the engine and the transmission as an assembly.

The dry weight of the standard engine with accessories is kg [ lbs]. Use a correctly rated hoist, and attach engine lifting fixture, Part No.

ST or Part No. NOTE: If the transmission is not removed, place a support under the transmission to prevent it from falling. Installations such as short and medium nose conventional chassis, the factory installed rear engine lifting brackets are usually removed due to space constraints. In this case, the service rear engine lifting bracket, Part No. Install the engine on two engine support stands, Part No. Label and remove all electrical wiring and controls.

Install caps or tape on the following openings to prevent moisture and dirt from entering the engine: 1. Both sides of the turbocharger. All oil, air, water, and fuel openings. Engine – Cleaning Warning: When using a steam cleaner, wear protective clothing and safety glasses or a face shield. Hot steam can cause serious personal injury. Use steam to clean the engine, and dry with compressed air. Remove the drain plug and the copper washer. Check the copper washer for wear. Drain the oil. If the drain plug is installed again, tighten the plug to the specified torque.

Coolant – Drainage Remove the plugs from the engine and open the cylinder block draincock and the oil cooler draincock. Use a suitable container to catch the coolant as it is drained. Crankcase Breather – Removal Loosen the hose clamp at the breather vent tube. Remove the tube support bracket capscrew and the bracket. Remove the tube and the hose from the engine.

Remove the four turbocharger mounting nuts. Remove the turbocharger and discard the gasket. NOTE: If the turbocharger mounting nuts do not loosen freely, split the nuts to avoid breaking a mounting stud. Remove two capscrews, and install two guide studs. Warning: Because this assembly weighs more than 23 kg [50 lbs], two people or a hoist will be required to lift the exhaust manifold assembly to avoid personal injury.

Remove the remaining ten capscrews, the exhaust manifold assembly, and the manifold gaskets. Starting Motor – Removal Warning: Because this part weighs more than 23 kg [50 lbs], two people or a hoist will be required to lift the starting motor to avoid personal injury.

Remove the three starting motor capscrews, the starting motor, and the spacer if used. It will drop as the fan is removed. Make sure to remove the fan and the fan hub spacer together. Remove the six capscrews and the fan. NOTE: Do not discard the fan spacers. The spacers provide the thickness needed to install the fan in the correct position. Alternator Belts – Removal Loosen the alternator to alternator support nut and capscrew.

Loosen the adjusting link capscrew and tensioning bolt, if applicable. Push the alternator toward the engine to release tension on the alternator belt, and remove the belt s. Alternator – Removal Remove the adjusting link capscrew and the adjusting link.

Remove the alternator to alternator support bracket, nut, washer, capscrew, and the alternator. Alternator Mounting Bracket – Removal Remove the three alternator mounting bracket capscrews and the mounting bracket.

Lubricating Oil Cooler Assembly Removal Remove the capscrew which holds the oil cooler support bracket to the cylinder block at the rear of the oil cooler. Remove one of the capscrews which holds the oil cooler support to the cylinder block. Install a guide stud in the hole. Engine Disassembly N14 Warning: Because this part weighs more than 23 kg [50 lbs], two people or a hoist will be required to lift the oil cooler assembly to avoid personal injury.

Remove the remaining five capscrews from the oil cooler support, and remove the cooler assembly. Coolant Inlet Transfer Connection Removal Loosen four mounting capscrews, and remove the coolant inlet transfer connection from the water pump. Piston Cooling Nozzles – Removal Remove the piston cooling nozzles. Locking pliers clamped to the piston cooling nozzle flange may be needed to prevent nozzle damage during removal. Remove and discard the o-rings.

Water Header Covers – Removal Remove the six capscrews from each of the two water header covers. Remove the covers, and discard the gaskets. Check the condition of the threads in the cylinder block before attempting to mount the engine on the engine stand. Clean the threads in the cylinder block, and repair any damaged threads. Engine Disassembly N14 Install the mounting plate adapter on the rear water header. Tighten the capscrews. Install the three adapter plate spacers over the capscrews.

Use a lifting fixture, Part No. ST or , to lift the engine. Align the exhaust side of the engine to the adapter plate of the rebuild stand. Installation such as short and medium nose conventional chassis, the factory installed rear engine lifting brackets are usually removed due to space contraints.

In this case, the portable rear engine lifting bracket, Part No. Align the mounting hole in the adapter plate 1 with the capscrew hole 2 in the mounting plate adapter. Use your fingers to tighten the capscrew. Engine Disassembly N14 Adjust the position of the engine so that the remaining mounting holes in the adapter plate 1 and 2 align with the capscrew holes in the cylinder block. Use your fingers to tighten the capscrews. Tighten all the adapter plate mounting capscrews in the sequence shown.

Remove the remaining four flywheel mounting capscrews. Warning: Because this part weighs more than 23 kg [50 lbs], two people or a hoist will be required to lift the flywheel to avoid personal injury. Tighten capscrews 1 and 2 in alternating sequence to loosen the flywheel.

Warning: Because this part weighs more than 23 kg [50 lbs], two people or a hoist will be required to lift the flywheel housing to avoid personal injury. Remove the remaining capscrews and the flywheel housing. NOTE: Use a mallet to loosen the housing from the dowels in the cylinder block if necessary. Remove the guide studs. Engine Disassembly N14 On wet-type flywheel housings, remove the o-ring from the rear cover and the 11 rectangular sealing rings from the flywheel housing. Rear Cover – Removal Remove the capscrews from the rear cover, and remove the cover from the crankshaft flange.

Fan Hub and Fan Hub Support Bracket – Removal Remove the four capscrews that attach the fan hub to the support bracket, and remove the fan hub assembly. Remove the four capscrews that attach the fan hub support 1 bracket to the cylinder block and the brace 2 , and remove the fan hub support bracket.

Remove the four capscrews that attach the front lifting bracket 3 to the rocker housing 4 , and remove the brace 2 and the lifting bracket 3. Water Pump Belt – Removal Loosen the idler pulley shaft lock nut. Turn the adjusting screw counterclockwise to release tension, and remove the water pump belt.

Thermostat Housing – Removal Disconnect the air compressor coolant return line from the thermostat housing. Air Compressor Coolant Inlet and Outlet Tubes – Removal Remove the coolant tubes to the air compressor, the cylinder block, and the water pump. Water Pump – Removal Remove the six mounting capscrews from the water pump.

NOTE: The water pump must be removed carefully to prevent damage to the impeller. Remove the water pump from the engine. Remove the water pump out and in a downward direction to clear the dowel pin. This dowel pin, used only on N14 cylinder blocks, prevents the installation of earlier model water pumps which do not incorporate an internal oil cooler coolant return passage.

Accessory Drive Pulley – Removal Remove the pulley retaining nut. Caution: The gear cover will be damaged if the puller capscrews extend beyond the rear face of the accessory drive pulley. Use a standard puller, Part No. ST, to remove the pulley. Vibration Damper – Removal Caution: Do not use a hammer or a screwdriver to remove a viscous damper. These tools can damage the viscous damper.

Remove one of the capscrews which holds the vibration damper and the pulley to the crankshaft, and install a guide stud in the hole. Remove the remaining five capscrews, the damper, and the pulley. Engine Support Bracket, Front Removal Remove the eight mounting capscrews and the front engine support bracket from the gear cover.

Plug the supply line to avoid dirt contamination. Caution: Hold the oil manifold fitting hex with a backup wrench while removing the supply line to avoid damaging the manifold. Remove the three external oil manifold hold down capscrews. Remove the three mounting clips, capscrews, and spacers.

Remove the external oil manifold from the connector. Remove the two oil manifold connector mounting capscrews. Remove the oil manifold connector from the rocker lever housing. NOTE: Use a wide, flat pry bar to pry at the center of the oil manifold connector. Remove the connector evenly from both pass through ports simultaneously to prevent damage to the connector or the rocker lever housing.

NOTE: If necessary, remove the intake air tube and elbow from the intake prior to removing the oil manifold connector.

Repeat this procedure for each rocker housing. Remove the following hoses from the STC oil control valve and the engine: 1. Fuel Rail Pressure Signal Hose 2.

Oil Supply Hose to Tappets 3. Crankcase Vent Hose 4. Oil Supply Hose from Oil Rifle. Engine Disassembly N14 Remove the clamp, check valve, and oil supply hose from the engine. Remove the valve. Remove the two capscrews attaching the mounting plate to the cylinder block and remove the mounting plate. Although the OEM harness is shown, this will be disconnected when the engine is out of chassis. Engine Disassembly N14 Disconnect the Deutsch three pin connector that contains the vehicle key switch, fan clutch, and engine brake control wires from the three pin connector which is wired directly into the Deutsch nine pin connector on the sensor harness.

Disconnect the actuator harness from each of the pass through connectors along the side of the rocker box housing. Cut and remove the plastic wire ties that hold the actuator harness to each of the pass through connectors.

Remove the clamp capscrew on the rear of No. Remove the retaining clamp of the sensor harness from the rear of the engine block. Disconnect the sensor harness from the intake air temperature sensor and the intake manifold pressure sensor. On engines equipped with engine brakes, disconnect the engine brake harness from the sensor wiring harness. These capscrews are metric. Remove the ECM from the cooling plate. Remove the sensor from the engine. Remove the sensor mounting capscrews. Remove the four cooling plate mounting capscrews.

Do not lose any of the heat resistant grommets. The heat resistant grommets are on both sides of the cooling plate. One of the mounting locations has heat resistant star washer grommets on both sides of the cooling plate. Remove the cooling plate. Remove the four capscrews and remove the fuel pump. Remove the spider coupling.

Air Compressor – Removal Disconnect the air supply line from the air compressor to the intake manifold. Accessory Drive – Removal Caution: If the accessory drive dowel pin has been incorrectly installed in the accessory drive shaft, the dowel pin must be removed before attempting to remove the accessory drive to prevent damage to the accessory drive bushing. Remove the five capscrews and the accessory drive assembly. Fuel Tubing – Removal Remove the retaining clamps and the fuel rail supply tube from the engine.

Remove the fuel return tube from the engine. Remove the fuel fittings from the rear of the cylinder head. Turn the EPS out of the cylinder block.

Use service tool, Part No. Lubricating Oil Transfer Tube Removal Remove the two capscrews from the flange at the oil pan and also the two capscrews from the flange at the lubricating oil pump. Remove the lubricating oil transfer tube. Engine Disassembly N14 Remove and discard the o-ring from the oil pan flange tube and the rectangular sealing ring from the lubricating oil pump mounting flange.

Lubricating Oil Pump – Removal Remove the five capscrews which hold the lubricating oil pump to the cylinder block. Caution: Do not pry on the lubricating oil pump mounting flange. Remove the lubricating oil pump from the cylinder block gear flange. Discard the gasket. Viscosity Sensor – Removal Remove the pressure signal line 1 , the oil supply line 2 , and drain line 3 from the viscosity sensor. Engine Disassembly N14 Remove the two mounting bracket capscrews from the pan rail.

Remove the entire assembly from the engine. Intake Manifold – Removal Remove the four capscrews that attach the intake air connector to the intake manifold.

Remove the nine capscrews, and remove the intake manifold. Rocker Housing Covers – Removal Remove the ten capscrews from each rocker lever cover. Remove the rocker lever covers.

The rocker housing cover gaskets can be used again if they are not damaged. Caution: Do not clean reusable gaskets with any solvent or steam. Solvent and steam will damage the gasket material. Clean only with soap and water. Remove the capscrews from each C-Brake housing. Remove the C-Brake housing. Remove the C-Brake housing gasket. Rocker Lever Shaft Assemblies Removal Loosen the valve and injector adjusting screw lock nuts on each rocker lever.

Turn the adjusting screws counterclockwise until the rocker levers are loose. Caution: Do not attempt to remove or install the rocker lever shaft assemblies without first loosening the levers.

Remove the rocker lever shaft capscrews and the rocker lever shaft assemblies. NOTE: To prevent increased wear, mark each rocker lever as it is removed so it can be installed back in its original location. NOTE: Hold the shaft at both ends so that the rocker levers do not slide off. Valve Crossheads – Removal Remove the crossheads. Be sure to mark them appropriately so they can be installed in the same location and orientation during the installation procedure.

NOTE: Excessive crosshead wear can result if the crossheads are not installed in their original locations. The larger hole on the underside of the crosshead must be oriented toward the exhaust side of the engine. Push Tubes – Removal Remove the push tubes. NOTE: To prevent increased wear, mark each push tube as it is removed so it can be installed back in its original location. Remove the injector hold down clamp capscrew.

Remove the injector and the hold down clamp. Use injector puller, Part No. Insert the pin of the tool into the hole provided in the body of the injector.

The hole faces the exhaust side of the engine. Caution: Do not catch the injector puller into the top stop spring cage. Damage to the injector will occur. STC Engines Remove the injector hold down clamp capscrew and the clamp. Insert the threaded end of the puller into the tapped hole in the STC oil feed lock nut. Rocker Lever Housing – Removal Remove the water manifold tube clamps.

For example, the tube between housing No. The tube between housing No. Remove the rocker housing mounting capscrews. NOTE: To prevent increased wear, mark each rocker lever housing as it is removed so it can be installed back in its original location. If the rocker housing assemblies are to be installed after rebuild with their original parts, mark each rocker lever housing as it is removed so it can be installed back in its original location thus taking advantage of worn-in mating parts.

Engine Disassembly N14 Remove the rocker lever housings. Remove the gaskets. Do not subject the pass through connectors to impact forces and do not rest the housing on the face with the pass through connectors.

Fuel Crossovers – Removal Remove the four capscrews from each of the two fuel crossovers, and remove the fuel crossovers. Remove and discard the four o-rings. Cylinder Heads – Removal Remove the 12 capscrews and washers from each cylinder head.

Warning: Because this part weighs more than 23 kg [50 lbs], two people or a hoist will be required to lift the cylinder heads to avoid personal injury. Lift the cylinder heads from the block, and remove the cylinder head gaskets. Caution: To prevent damage to the head gasket surface, put the cylinder heads on wooden blocks when they are removed. Cam Follower Assemblies – Removal Remove the cam follower housing assemblies as follows: 1.

Remove the six capscrews and studs from each cam follower housing. NOTE: Record the position of the studs prior to removal. Remove the cam follower housings and gaskets. NOTE: To prevent increased wear, mark the cam follower housing assemblies as they are removed so they can be installed back in their original location on the block.

Camshaft Bearing Support – Removal Remove the three capscrews from the support. Use a rubber or plastic mallet to rotate the bearing support approximately 60 degrees.

Use a suitable pry bar to remove the bearing support from the gear cover. NOTE: Be careful not to damage the bearing support surfaces. Remove the remaining gear cover capscrews, and remove the gear cover. Accessory Drive Seal – Removal Remove the accessory drive seal. Camshaft – Removal Install four camshaft pilots, Part No.

Use a rubber band to hold the installation pilots in place. The rubber band must straddle the valve lobe. Engine Disassembly N14 Use one hand to slowly rotate and pull the camshaft from the cylinder block and the other hand to balance the camshaft as it is removed. Remove the camshaft thrust washer from the camshaft. Piston and Connecting Rod Assemblies – Removal Caution: Piston cooling nozzles must be removed prior to the removal of the piston and connecting rod assemblies.

Plug the overhead oil rifle, push tube cavities, and coolant passages in the block; and use a rotary wire brush to remove the carbon ring from the top of the cylinder liner.

Use a scraper that has an aluminum blade if a rotary wire brush is not available. Use lint-free paper to remove all the broken wire bristles and loose carbon from the cylinders.

Rotate the crankshaft to position two of the connecting rods at bottom dead center BDC. Loosen the connecting rod capscrews. NOTE: Do not remove the capscrews. Hit the connecting rod capscrews with a rubber hammer to loosen the rod caps from the dowels.

Remove the connecting rod capscrews and the rod caps. NOTE: Push the rod away from the crankshaft, over the crankshaft rod journal, and push the rod until the piston rings are outside of the top of the cylinder liner. Remove the piston and rod assembly. NOTE: The piston and connecting rod assemblies must be installed in the same cylinder number from which they were removed to make sure correct fit of worn mating surfaces if parts are to be used again.

Use a tag to mark the cylinder number from which each piston and rod assembly was removed. NOTE: The pistons must have the cylinder numbers stamped on the piston top toward the camshaft side of the engine. Caution: The rod cap alpha-numeric characters must match the alpha-numeric characters on the connecting rod and must be installed with the characters aligned to prevent damage to the connecting rods and the crankshaft.

Engine Disassembly N14 Remove the upper rod bearing. Caution: Do not over expand the piston rings. Maximum gap at assembly is 1. Use the piston ring expander, Part No. Put a tag on the rings, and record the cylinder number of the piston on the tag for future reference if required. Use internal snap ring pliers to remove the snap rings from both sides of the piston.

Caution: Do not use a hammer to remove the piston pins. The piston can distort and cause the piston to seize in the liner. Use a blunt tool to push the piston pin from the piston and rod assembly. Cylinder Liners – Removal Caution: The liner puller must be installed and used as described to avoid damage to the cylinder block.

When using cylinder liner puller, Part No. NOTE: The liner puller must be centered on the top of the cylinder block. The feet on the extension arms must be extended below the bottom of the liner. Engine Disassembly N14 Turn the puller jackscrew clockwise. Use both hands to remove the liners.

Remove and discard the o-rings and the crevice seals. NOTE: Do not discard the sealing rings which are located under the cylinder liner flange. Sealing rings can be used again. Use a liquid metal marker to mark the cylinder number on each liner. If the sealing rings were removed, do the following: 1. Use a tag to mark the cylinder number.

Measure in several places and record the thickness of the sealing rings used in each cylinder. The thickness of the sealing ring is one factor in determining liner protrusion. This information must be known when the liners are installed in the engine. Caution: The liner puller must be installed and used as described to avoid damage to the cylinder block.

Caution: The puller plate must not overlap the liner outside diameter. NOTE: The puller plate must be parallel to the main bearing saddles. Turn the puller jackscrew clockwise. Use both hands to remove the liner.

Remove and discard the crevice seals and the o-rings. NOTE: Do not discard the sealing rings which are located under the liner flange. Engine Disassembly N14 Use a liquid metal marker to mark the cylinder number on each liner. Crankshaft – Removal Caution: The main bearing caps must be marked for position and cylinder block identification.

The position number 1 of the cap is stamped on the camshaft side and the block identification number 2 is stamped on the exhaust side of the cap. The cylinder block identification number is stamped on the front and the rear of the oil pan flange on the camshaft side of the engine.

Check and mark all caps that are not marked before removing them from the cylinder block. Remove the main bearing capscrews and the washers. ST, to remove the caps. The service tool must be centered on the main bearing cap. NOTE: Use a pencil or scribe to mark the bearing shells with the journal number from which they were removed if they are to be used again or if failure analysis is required.

Mark the bearing on the back side or in the locating tang. Remove the lower main bearing shell from the crankshaft journal. Remove the dowel ring. Remove the thrust bearings from the No. Mark these bearings as the front and the rear thrust bearings. Caution: Do not damage the crankshaft when removing the thrust bearings. Use a blunt tool to remove the upper thrust bearings. Mark these bearings in the notched area as the front and the rear thrust bearings.

NOTE: If necessary, slide the crankshaft to the front or to the rear to allow the thrust bearings to be removed. Engine Assembly N14 Warning: Because this part weighs more than 23 kg [50 lbs], two people or a hoist will be required to lift the crankshaft to avoid personal injury. Use a hoist and a lifting sling to remove the crankshaft. Push the upper main bearing on the end that does not have the dowel ring groove. NOTE: Mark the bearing shells with the journal number from which they were removed if they are to be used again or if failure analysis is required.

Remove the capscrews and the cylinder block from the rebuild stand. Refer to Cylinder Block, Group 01, for cleaning and inspection purposes. Install the mounting plate adapter on the rear water header if removed during the cleaning or inspection procedure. Use a nylon lifting sling, Part No. Put the oil cooler side of the cylinder block to the adapter plate of the rebuild stand.

Engine Assembly N14 Adjust the position of the cylinder block so that the remaining mounting holes in the adapter plate 2 and 3 align with the capscrew holes in the cylinder block. Crankshaft – Installation The main bearing shells are three different widths.

The narrow main bearing shells fit locations Nos. The wide main bearing shells fit locations Nos. The widest main bearing shell fits the No. Engine Assembly N14 Caution: The upper main bearing shells have a groove and an oil hole to provide crankshaft lubrication. The lower main bearing shells do not. Both bearings are marked on the back to indicate the location and either standard std. The amount of OS is stamped on the back in U. The groove for the No.

The wider part of the No. NOTE: If used bearing shells are to be installed, each must be installed in its original location in the engine. The bearing journal numbers must have been marked on the bearing during disassembly.

Caution: Do not lubricate the back of the bearing. Use a lint free cloth to clean the bearing and the mounting surface. Engine Assembly N14 Align the ring dowel groove in the bearings with the counterbore in the cylinder block, and install the bearings.

Both ends of the bearing will be approximately 1. Caution: Prevent dirt from mixing with the lubricant. Dirty lubricant will cause low mileage failures. Use clean LubriplateT or its equivalent to lubricate the upper bearing shells.

Warning: Because this part weighs more than 23 kg [50 lbs], two people or a hoist will be required to lift the part to avoid personal injury. Caution: Use a lifting strap that will not damage the crankshaft. Do not drop the crankshaft on the bearings. The end of the crankshaft with the smallest diameter must point toward the front of the block. Install the crankshaft. Engine Assembly N14 Use a lint free cloth to clean the thrust bearings, the main bearing shells, and the main bearing caps.

NOTE: If used thrust bearings are to be installed, each must be installed in its original location in the engine. Use clean LubriplateT or its equivalent to lubricate the upper thrust bearings. Caution: The grooves must be toward the crankshaft. Install the upper thrust bearings in the No. NOTE: Push the crankshaft toward the front of the engine to install the front bearing and to the rear of the engine to install the rear bearing.

The end of the thrust bearings must be even with the main bearing cap mounting surface. Caution: Do not intermix the main bearing dowel ring and the main bearing capscrew washers. The hardened main bearing capscrew washer 1 is approximately 0. Intermixing the capscrew washers and dowel rings will result in main bearing failure.

Engine Assembly N14 Install the dowel ring in the dowel ring counterbore of the cylinder block. Install the lower main bearing shells as follows: Use clean LubriplateT or its equivalent to lubricate the bearing shell to the crankshaft journal mating surface.

Engine Assembly N14 The end of the lower main bearing shell opposite the dowel ring must be engaged between the crankshaft and the cylinder block and be seated against the end of the upper bearing shell. NOTE: If installed correctly, the ends of the bearing shells 1 will meet approximately 1. Use clean LubriplateT or its equivalent to lubricate the lower thrust bearings. Put the lower thrust bearings around the No. NOTE: The notch 1 on the outside diameter of the lower thrust bearings must align with the locating pins in the No.

Use clean 15W oil to lubricate the capscrew threads and the flat washers. Caution: Drain the excess oil from the capscrews before installing them in the cylinder block to prevent hydraulic lock and possible damage to the cylinder block during the capscrew torquing operation.

Engine Assembly N14 Caution: The main bearing caps are marked for position 1 on the camshaft side and the cylinder block identification 2 on the exhaust side. The cylinder block identification number 3 is stamped on the pan rail on the camshaft side of the block.

Install the caps in the correct position with the position number to the camshaft side and its part number toward the rear of the engine. Install the main bearing caps. Align the capscrew holes in the cap with the holes in the cylinder block.

Make sure the dowel ring and the lower bearing shell are in position. Install the capscrews and the washers through the cap and into the cylinder block.

 
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CUMMINS N14 ENGINE SERVICE REPAIR MANUAL- PDF DOWNLOAD by heydownloads – Issuu – Related products

 
Oct 14,  · Foreword This manual contains complete rebuild specifications and information for the N14 model engines, and all associated components manufactured by Cummins Engine Company, Inc. Related Manuals for Cummins N14 Engine CUMMINS NH Shop Manual 83 pages Engine CUMMINS NTAL4 Maintenance And Operator’s Manual pages. Cummins M11 Series Engines (STC, CELECT, CELECT PLUS Models) Service Repair Manual. Cummins ISB and QSB (Common Rail Fuel System) Engines Service Repair Manual. Cummins ISB CM & CM Engines Service Repair Manual. Cummins ISB, ISBe2, ISBe3, ISBe4, QSB, QSB, QSB, ISC, QSC, ISL, ISLe3, ISLe4, and QSL9, CM Electronic Control.

 
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