AMC Coupes/Sedans/Wagons 1975-1988 Repair Information

Camshaft

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REMOVAL & INSTALLATION



Caution must be taken when performing this procedure. Camshaft bearings are coated with babbit material, which can be damaged by scraping the cam lobes across the bearing.

4-121 Engine See Figure 1

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Fig. Fig. 1: Location of the camshaft bearings4-121 engine

  1. Remove the air cleaner assembly, and the distributor cap with the wires attached.
  2.  
  3. Remove the accessory belts, and the belt guard. Loosen and remove the camshaft drive belt.
  4.  
  5. Remove the distributor and housing assembly from the rear of the cylinder head.
  6.  
  7. Remove the cylinder head cover, and the camshaft pulley from the camshaft.
  8.  

Use a tool to prevent the sprocket from turning while removing the retaining bolt, and protect the head surface by wrapping a cloth around the end of the tool.

  1. Remove the bolts from number 5 camshaft bearing cap (rear cap), and them remove the retaining nuts from caps 1, 3, and 5. Next remove the nuts on bearing caps number 2 and 4, backing off each nut 1 / 4 turn at a time to relieve tension on the camshaft. Remove the oil pipe retainers from the bolts on bearing caps number 2 and 4.
  2.  
  3. Remove all the camshaft bearing caps from the cylinder head. Keep them in order.
  4.  
  5. Remove the camshaft from the cylinder head.
  6.  

The distributor drive fear should be removed from the camshaft with a puller. It can be replaced by driving the gear on the camshaft with the use of a block or wood and a hammer. Note the gear location before removal.

  1. The tappets may be removed for service by lifting them our of their bores in the cylinder head.
  2.  

To install:
  1. On installation, lubricate the camshaft lobes and bearing surfaces and install the shaft into the cylinder head. Install the camshaft bearing caps on their respective seats, and install the retaining nuts on cap numbers 2 and 4, tightening to 13 ft. lbs.
  2.  
  3. Torque numbers 3 and 5 retaining nuts to 13 ft. lbs. Install the bolts in bearing cap number 5 and torque to 7 ft. lbs.
  4.  
  5. Install a replacement seal on the camshaft and tighten the number 1 bearing cap to 13 ft. lbs. torque. Install the oil pipe and tighten the nuts to 13 ft. lbs.
  6.  
  7. Install the camshaft sprocket and torque the retaining bolt to 58 ft. lbs., while holding the sprocket to prevent its turning.
  8.  
  9. Temporarily install the cylinder head cover and position the camshaft pulley timing mark in line with the indicator on the cylinder head cover.
  10.  
  11. Install the distributor and housing on the rear of the cylinder head, setting the rotor to the number one cylinder position.
  12.  
  13. Install the distributor cap and wiring, attach the vacuum line, and connect the primary wire.
  14.  
  15. Rotate the crankshaft to the TDC mark. Install the camshaft drive belt and adjust. Refer to Belt Removal and Installation.
  16.  
  17. Reassemble the drive belt guard, replace the accessory belts and adjust.
  18.  
  19. Remove the cylinder head cover and adjust the tappet to camshaft clearance.
  20.  
  21. Install the cylinder head cover and complete the assembly. Start the engine and adjust the ignition timing.
  22.  

4-150 Engine See Figures 2, 3, 4 and 5

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Fig. Fig. 2: Use tool J-21884 or its equivalent to remove the lifters from the 4-150 engine



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Fig. Fig. 3: Check the face of the lifter for squareness and damage



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Fig. Fig. 4: Carefully remove the camshaft from the engine block4-150 engine



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Fig. Fig. 5: Typical camshaft lobe measurements


CAUTION
Please refer to General Information and Maintenance before discharging the compressor or disconnecting air conditioning lines. Damage to the air conditioning system or personal injury could result. Consult your local laws concerning refrigerant discharge and recycling. In many areas it may be illegal for anyone but a certified technician to service the A/C system. Always use an approved recovery station when discharging the air conditioning.

  1. Disconnect the battery ground.
  2.  
  3. Drain the cooling system.
  4.  


CAUTION
When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Remove the radiator, discharge the refrigerant system (refer to General Information and Maintenance ) and remove the condenser.
  2.  
  3. Remove the fuel pump.
  4.  
  5. Matchmark the distributor and engine for installation. Note the rotor position by marking it on the distributor body. Unbolt and remove the distributor and wires.
  6.  

  1. Remove the rocker arm cover.
  2.  
  3. Remove the rocker arm assemblies.
  4.  
  5. Remove the pushrods.
  6.  

Keep everything in order for installation.

  1. Using a tool J-21884 or its equivalent, remove the hydraulic lifters.
  2.  
  3. Remove the pulley, vibration damper and timing case cover. Remove the crankshaft oil slinger.
  4.  

If the camshaft sprocket appears to have been rubbing against the cover, check the oil pressure relief holes in the rear cam journal for debris.

  1. Remove the timing chain and sprockets.
  2.  
  3. Slide the camshaft from the engine.
  4.  

To install:

CAUTION
The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

  1. Inspect all parts for wear and damage. Lubricate all moving parts with engine oil supplement.
  2.  
  3. Slide the camshaft into the engine, carefully, to avoid damage to the bearing surfaces.
  4.  
  5. Install the timing chain and sprockets. Make sure that all camshaft timing marks align. Torque the camshaft sprocket bolt to 50 ft. lbs.
  6.  
  7. Install the timing case cover.
  8.  
  9. Using a tool J-21884 or its equivalent, install the hydraulic lifters.
  10.  
  11. Install the pushrods.
  12.  
  13. Install the rocker arm assemblies.
  14.  
  15. Install the rocker arm cover.
  16.  
  17. Install the distributor and wires. When installing the distributor, make sure that all matchmarks align. It may be necessary to rotate the oil pump drive tang with a long bladed screwdriver to facilitate installation of the distributor.
  18.  

If the distributor is not installed correctly, or removed later, the complete installation procedure must be done again.

  1. Install the fuel pump.
  2.  
  3. Install the radiator.
  4.  
  5. Install the condenser and evacuate and charge the refrigerant system. Refer to General Information and Maintenance for this procedure.
  6.  
  7. Fill the cooling system.
  8.  
  9. Connect the battery ground.
  10.  

4-151 Engine

  1. Remove the air cleaner.
  2.  
  3. Drain the cooling system.
  4.  


CAUTION
When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Remove the timing gear cover.
  2.  
  3. Disconnect the radiator hoses at the radiator. Remove the radiator.
  4.  
  5. Remove the two camshaft thrust plate screws through the holes in the camshaft gear.
  6.  
  7. Remove the tappets.
  8.  
  9. Remove the distributor, oil pump drive and fuel pump.
  10.  
  11. Remove the camshaft and gear assembly by pulling out through front of the block. Support the shaft carefully when removing it to prevent damaging the camshaft bearings.
  12.  

To install:
  1. Thoroughly coat the camshaft journals with a high quality engine oil supplement such as STP or its equivalent.
  2.  
  3. Install the camshaft assembly in engine block. Use care to prevent damaging the bearings or the camshaft.
  4.  
  5. Turn the crankshaft and camshaft so that the valve timing marks on the gear teeth are aligned. The engine is now in number four cylinder firing position. Install the camshaft thrust plate-to-block screws and tighten to 75 inch lbs.
  6.  
  7. Install the timing gear cover and gasket.
  8.  
  9. Line up the keyway in the hub with the key on crankshaft and slide the hub onto the shaft. Install the center bolt and tighten to 160 ft. lbs.
  10.  
  11. Install the valve tappets, pushrods, pushrod cover, oil pump shaft and gear assembly and the fuel pump. Install the distributor according to the following procedure:
    1. turn Turn the crankshaft 360° to the firing position of the number one cylinder (number one exhaust and intake valve tappets both on base circle [heel] of the camshaft and the timing notch on the vibration damper is indexed with the Top Dead Center mark [TDC] on the timing degree scale).
    2.  
    3. Install the distributor and align the shaft so that the rotor arm points toward the number one cylinder spark plug contact.
    4.  

  12.  
  13. Install the rocker arms and pivot balls over the pushrods. With the tappets on the base circle (heel) of camshaft, tighten the rocker arm capscrews to 20 ft. lbs. Do not overtighten.
  14.  
  15. Install the cylinder head cover.
  16.  
  17. Install the intake manifold.
  18.  
  19. Install the radiator and lower radiator hose.
  20.  
  21. Install the belt, fan and shroud. Tighten the fan bolts to 18 ft. lbs.
  22.  
  23. Install the upper radiator hose.
  24.  
  25. Tighten the belts.
  26.  

6-232 and 258 Engines See Figures 6 through 11

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Fig. Fig. 6: Use a dial indicator to check the camshaft for straightness



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Fig. Fig. 7: Cross-sectional view of a typical camshaft bearing removal and installation tool for OHV engines



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Fig. Fig. 8: Use a feeler gauge to check the cam-shaft end-play



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Fig. Fig. 9: A dial indicator may be used to check the camshaft end play



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Fig. Fig. 10: Use a dial indicator to check the camshaft gear backlash



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Fig. Fig. 11: Measure the camshaft gear run-out with a dial indicator

  1. Drain the cooling system and remove the radiator. With air conditioning, remove the condenser and receiver assembly as a unit, without disconnecting any lines or discharging the system.
  2.  


CAUTION
When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Remove the valve cover and gasket, the rocker assemblies, pushrods, cylinder head and gasket and the lifters.
  2.  

The valve train components must be replaced in their original locations.

  1. Remove the drive belts, cooling fan, fan hub assembly, vibration damper and the timing chain cover.
  2.  
  3. Remove the fuel pump and distributor assembly, including the spark plug wires.
  4.  
  5. Rotate the crankshaft until the timing mark of the crankshaft sprocket is adjacent to, and on a center line with, the timing mark of the camshaft sprocket.
  6.  
  7. Remove the crankshaft sprocket, camshaft sprocket, and the timing chain as an assembly.
  8.  
  9. Remove the front bumper or grille as required and carefully slide out the camshaft.
  10.  

To install:
  1. Coat all parts with engine oil supplement.
  2.  
  3. Slide the camshaft into place.
  4.  
  5. Install the front bumper and/or grille.
  6.  
  7. Install the crankshaft sprocket, camshaft sprocket, and the timing chain as an assembly.
  8.  
  9. Rotate the crankshaft until the timing mark of the crankshaft sprocket is adjacent to, and on a center line with, the timing mark of the camshaft sprocket.
  10.  
  11. Install the fuel pump and distributor assembly, including the spark plug wires.
  12.  
  13. Install the drive belts.
  14.  
  15. Install the cooling fan and fan hub assembly.
  16.  
  17. Install the vibration damper.
  18.  
  19. Install the cylinder head and gasket and the lifters.
  20.  
  21. Install the rocker assemblies and pushrods.
  22.  
  23. Install the valve cover and gasket.
  24.  
  25. Install the the timing chain cover.
  26.  
  27. With air conditioning, install the condenser and receiver.
  28.  

The valve train components must be replaced in their original locations.

  1. Install the radiator and fill the cooling system.
  2.  

8-304, 360 and 401 Engines See Figure 12

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Fig. Fig. 12: Exploded view of a typical camshaft used on the 8-cylinder 304, 360 and 401 engines

  1. Disconnect the battery cables.
  2.  
  3. Drain the radiator and both banks of the block. Remove the lower hose at the radiator, the by-pass hose at the pump, the thermostat housing and the radiator. With air conditioning, remove the condenser and receiver assembly as a unit, without disconnecting any lines or discharging the system.
  4.  


CAUTION
When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Remove the distributor, all wires, and the coil from the manifold.
  2.  
  3. Remove the intake manifold as an assembly.
  4.  
  5. Remove the valve covers, rocker arms and pushrods.
  6.  
  7. Remove the lifters.
  8.  

The valve train components must be replaced in their original locations.

  1. Remove the cooling fan and hub assembly, fuel pump, and heater hose at the water pump.
  2.  
  3. Remove the alternator and bracket as an assembly. Just move it aside, do not disconnect the wiring.
  4.  
  5. Remove the crankshaft pulley and the damper. Remove the lower radiator hose at the water pump.
  6.  
  7. Remove the timing chain cover.
  8.  
  9. Remove the distributor/oil pump drive gear, fuel pump eccentric, sprockets and the timing chain.
  10.  
  11. Remove the grille.
  12.  
  13. Remove the camshaft carefully by sliding it forward out of the engine.
  14.  

To install:
  1. Coat all parts with engine oil supplement.
  2.  
  3. Slide the camshaft, carefully, into the engine.
  4.  
  5. Install the grille.
  6.  
  7. Install the distributor/oil pump drive gear, fuel pump eccentric, sprockets and the timing chain.
  8.  
  9. Install the timing chain cover.
  10.  
  11. Install the crankshaft pulley and the damper.
  12.  
  13. Install the lower radiator hose at the water pump.
  14.  
  15. Install the alternator and bracket as an assembly.
  16.  
  17. Install the cooling fan and hub assembly.
  18.  
  19. Install the fuel pump.
  20.  
  21. Install the heater hose at the water pump.
  22.  
  23. Install the lifters.
  24.  

The valve train components must be replaced in their original locations.

  1. Install the valve covers, rocker arms and pushrods.
  2.  
  3. Install the intake manifold as an assembly.
  4.  
  5. Install the distributor, all wires, and the coil on the manifold.
  6.  
  7. Install the radiator.
  8.  
  9. With air conditioning, install the condenser and receiver assembly.
  10.  
  11. Install the thermostat and housing.
  12.  
  13. Install the by-pass hose at the pump.
  14.  
  15. Install the lower hose at the radiator.
  16.  
  17. Fill the cooling system.
  18.  
  19. Connect the battery cables.
  20.  

 
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