Jeep Wagoneer/Commando/Cherokee 1957-1983 Repair Information

Timing Cover and Seal

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REPLACEMENT4-134 Engine



On FC models, first drain the cooling system and remove the radiator.


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 drive belts and crankshaft pulley.
  2.  
  3. Remove the attaching bolts, nuts and lock washers that hold the timing gear cover to the engine.
  4.  
  5. Remove the timing gear cover.
  6.  
  7. Remove the timing pointer.
  8.  
  9. Remove the timing gear cover gasket.
  10.  
  11. Remove and discard the crankshaft oil seal from the timing gear cover.
  12.  
  13. Installation is the reverse of removal. Replace the crankshaft oil seal. Use a new timing gear cover gasket. Torque the bolts to 12-15 ft. lb.
  14.  

6-225 Engine

Special tools are needed for this job.

  1. Remove the water pump and crankshaft pulley.
  2.  
  3. Remove the two bolts that attach the oil pan to the timing chain cover.
  4.  
  5. Remove the five bolts that attach the timing chain cover to the engine block.
  6.  
  7. Remove the cover and gasket.
  8.  
  9. Remove the crankshaft front oil seal with a seal driver.
  10.  
  11. From the rear of the cover, coil new packing around the crankshaft opening so that the ends of the packing are at the top. Drive in a new shredder. Stake the shredder with at punch, at three places to secure it. Smooth the packing with a hammer handle or other round object to facilitate its sliding on the crankshaft.
  12.  


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. If the oil pump was not removed from the timing chain cover, the pump cover must now be removed and the cavity around the gears completely packed with petroleum jelly. There must be no air pockets left in the pump. Replace the cover screws and gasket and torque the screws evenly and alternately to 12 ft. lb.
  2.  
  3. Thoroughly clean the gasket surfaces of the timing cover and block.
  4.  
  5. Coat the block surface with gasket sealer and position a new gasket on the mating surface.
  6.  

Two different gaskets have been used in production. Make sure that you have the right one.

  1. Coat the mating surface of the timing cover with gasket sealer and position it on the block. Align it, using the seal driver as an aligning tool.
  2.  
  3. Dip the cover attaching bolts in clean engine oil. Make certain that the dowel pins engage their holes, and insert the attaching bolts.
  4.  
  5. Torque the bolts to 33 ft. lb.
  6.  

6-226 Engine

Special tools are needed for this job.

  1. Drain the cooling 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 radiator.
  2.  
  3. Remove the vibration damper and timing pointer.
  4.  
  5. Unbolt and remove the cover. Discard the gasket.
  6.  
  7. Brace the cover and drive out the old seal.
  8.  
  9. Drive the new seal into place, making sure that it is flush and not cocked. Lubricate the inner seal surface with clean engine oil.
  10.  
  11. Coat both sides of a new gasket with sealer and position it on the block.
  12.  
  13. Position the cover on the block, and if one is available, use an aligning tool to aid in positioning the cover.
  14.  
  15. Install the bolts and tighten them to 15 ft. lb.
  16.  
  17. Install all other parts in reverse order of removal. Fill the cooling system.
  18.  

6-230 Engine See Figures 1 and 2

Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the timing chain cover and its related components 6-230 engine



Click image to see an enlarged view

Fig. Fig. 2: Timing cover bolt torque sequence 6 cyl-230 engine

Special tools are needed for this job.

  1. Remove the fan, hub and drive pulley.
  2.  
  3. Remove the water pump.
  4.  
  5. Remove the oil pump.
  6.  
  7. Remove the distributor.
  8.  
  9. Remove the thermostat and housing.
  10.  
  11. Remove the bolt and pilot washer that attach the vibration damper to the crankshaft. Later model engines have a lock plate on the damper.
  12.  
  13. Using a puller, remove the damper from the crankshaft.
  14.  
  15. Using seal remover W-286, pull the front seal from the case.
  16.  
  17. Remove the hose from the water port of the cover.
  18.  
  19. Unbolt and remove the cover from the front plate.
  20.  
  21. Make sure that the mating surfaces of the cover and block are clean.
  22.  
  23. Coat both sides of the new gaskets with sealer and position them on the block.
  24.  
  25. Place the cover on the block and install and tighten the bolts. Torque the 5 / 16 in. bolts to 12-15 ft. lb. and the 3 / 8 in. bolts to 15-20 ft. lb.
  26.  
  27. Using a seal driver, install a new front seal. Apply sealer to the outer rim of the seal and clean engine oil to the seal lips prior to installation.
  28.  
  29. Install all other parts in reverse order of removal. The vibration damper may be pressed on by reversing the removal tool. Torque the damper bolt to 100-130 ft. lb. If a damper lock is used, torque the bolts to 40-50 ft. lb.
  30.  

6-232 and 258 Engines See Figure 3

Click image to see an enlarged view

Fig. Fig. 3: Exploded view of the timing cover and seal 6 cyl-232 and 258 engines


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. Remove the drive belts, engine fan and hub assembly, the accessory pulley and vibration damper.
  2.  
  3. Remove the oil pan to timing chain cover screws and the screws that attach the cover to the block.
  4.  
  5. Raise the timing chain cover just high enough to detach the retaining nibs of the oil pan neoprene seal from the bottom side of the cover. This must be done to prevent pulling the seal end tabs away from the tongues of the oil pan gaskets, which would cause a leak.
  6.  
  7. Remove the timing chain cover and gasket from the engine.
  8.  
  9. Use a razor blade to cut off the oil pan seal end tabs flush with the front face of the cylinder block and remove the seal. Clean the timing chain cover, oil pan, and cylinder block surfaces.
  10.  
  11. Remove the crankshaft oil seal from the timing chain cover.
  12.  
  13. Install in reverse order of the above procedure. It will be necessary to cut the same amount from the end tabs of a new oil pan seal as was cut from the original seal, before installing the new gasket.
  14.  

8-304, 360 and 401 Engines See Figure 4

Click image to see an enlarged view

Fig. Fig. 4: Timing case, cover and seal 8 cyl-304, 360 and 401 engines. The unit shown is for models through 1976. Most 1977-83 models are identical except for seal location

  1. Remove the negative battery cable.
  2.  
  3. Drain the cooling system and disconnect the radiator hoses and bypass hose.
  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 all of the drive belts.
  2.  
  3. Remove the alternator and the front portion of the alternator bracket as an assembly.
  4.  
  5. Disconnect the heater hose.
  6.  
  7. Remove the power steering pump, and/or the air pump, and the mounting bracket as an assembly. Do not disconnect the power steering hoses.
  8.  
  9. Remove the distributor cap and note the position of the rotor. Remove the distributor. (See the Engine Electrical Section.)
  10.  
  11. Remove the fuel pump.
  12.  
  13. Remove the vibration damper and pulley.
  14.  
  15. Remove the two front oil pan bolts and the bolts which secure the timing chain cover to the engine block.
  16.  
  17. Remove the cover by pulling forward until it is free of the locating dowel pins.
  18.  
  19. Clean the gasket surface of the cover and the engine block.
  20.  
  21. Pry out the original seal from inside the timing chain cover and clean the seal bore.
  22.  
  23. Drive the new seal into place with a punch until it contacts the outer flange of the cover.
  24.  
  25. Apply a light film of motor oil to the lips of the new seal.
  26.  
  27. Install the timing chain cover in reverse order of removal. Refer to the Engine Electrical section for the distributor installation procedure.
  28.  

8-327 Engine

Special tools are needed for this job.

  1. Drain the cooling 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. Loosen all drive belts and remove them.
  2.  
  3. Remove the radiator.
  4.  
  5. Remove the bolt, lockwasher, fly washer and the cork washer attaching the vibration damper to the crankshaft. Use a puller to remove the vibration damper from the crankshaft. A standard gear puller will do.
  6.  
  7. After the vibration damper is removed, the timing chain cover oil seal can be removed and a new one installed without removing the timing chain cover, by using a timing chain cover oil seal removal and installation tool (Jeep Tool Number J-9233). To remove the seal using the tool, turn the heavy threads into the oil seal until the seal is tightly engaged, then turn down the puller screw against the crankshaft to pull the seal out of the cover.
  8.  
  9. Install the seal with a timing chain cover oil seal installer (Jeep Tool Number J-9163). First, apply sealer lightly to the outer diameter of the seal and lubricate the inner diameter with clean engine oil. If the special tools are not available, it is possible that the seal can be removed by prying it out with the tip of a screwdriver or another similar tool. The new seal can be installed with sealer applied to the outside and lubricant to the inside, by gently tapping it evenly in place with a hammer and a block of wood.
  10.  

The only other way to replace the oil seal is to remove the entire timing chain cover from the engine and replace the seal with the cover on a workbench. Follow the procedure given below for removing the timing chain cover.

  1. Drain the cooling system and remove the radiator, vibration damper, water pump and the fuel pump. Remove the alternator and power steering pump, if necessary.
  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 water outlet manifold by removing the 4 capscrews and lockwashers holding the manifold to the engine. Remove the manifold, manifold gaskets, and the timing chain cover O-ring. Discard the O-ring.
  2.  
  3. Remove the two nuts and lockwashers from the studs at the bottom of the timing case cover and the nut and lockwasher from the stud below the water intake.
  4.  
  5. Remove the remaining capscrews of the timing case cover. Insert a screwdriver between the block and the timing case cover and lightly pry the cover from the block gasket.
  6.  
  7. Once the timing case cover is removed, the removal and installation of the oil seal is obvious. Replace the timing case cover in the reverse order of removal.
  8.  

Do not tighten the timing case cover attaching bolts until the vibration damper is installed. This will assure that the cover and the damper are properly aligned.

8-350 Engine See Figure 5

Click image to see an enlarged view

Fig. Fig. 5: View of the timing chain cover removal and installation Buick-built V8 engines

  1. Drain the cooling system and remove the radiator, shroud, fan, pulleys and drive belts.
  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 crankshaft pulley, fuel pump and distributor.
  2.  
  3. Remove the alternator and the power steering pump, if necessary.
  4.  
  5. Loosen and slide rearward the front clamp on the thermostat bypass hose.
  6.  
  7. Remove the vibration damper.
  8.  
  9. Remove the bolts attaching the timing chain cover to the cylinder block and oil pan. Remove the timing chain cover assembly and gasket.
  10.  
  11. Use a punch to drive the oil seal out of the cover. Drive the seal from the front toward the rear of the timing chain cover.
  12.  
  13. Tap the new seal into place from the rear of the timing case cover. If a rope seal is used, position the join of the two ends at the top, then drive in a new shedder with a suitable punch. Stake the shedder in at least 3 places to secure it in position. Size the packing by rotating a hammer handle or similar smooth tool around the inside of the seal to obtain clearance for the crankshaft hub.
  14.  
  15. If the oil pump has not been removed from the timing chain cover, remove the attaching screws, oil pump cover and gasket from the timing chain cover.
  16.  
  17. Completely pack the space around the oil pump gears with petroleum jelly. There must be no air space left inside the pump. Secure the oil pump cover and a new gasket to the timing chain cover with the 5 slotted attaching screws. Torque the screws alternately and evenly to 8-12 ft. lb.
  18.  

Unless the oil pump gears are packed with petroleum jelly, the pump may not prime itself when the engine is started, thus oil will not be pumped throughout the engine for lubrication.

  1. The gasket surfaces of the cylinder block and the timing chain cover must be smooth and clean before positioning the gasket in place on the engine. Use sealer on the engine and timing chain cover mating surfaces.
  2.  
  3. Position the timing chain cover to the engine block. Be sure that the dowel pins on the engine engage the holes in the cover before installing the bolts.
  4.  
  5. Install the attaching bolts and tighten them evenly to 30 ft. lb.
  6.  

 
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