Jeep CJ 1945-1970 Repair Information

Timing Chain/Gear Cover and Oil Seal

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REMOVAL & INSTALLATION



4-134 Engines

See Figures 1 through 8



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Fig. Fig. 1: Remove the lower pulley retaining nut ...



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Fig. Fig. 2: ... and slide the pulley off of the crankshaft



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Fig. Fig. 3: Clean around the breather tube fitting ...



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Fig. Fig. 4: ... then remove the fitting from the front cover



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Fig. Fig. 5: Remove the front cover mounting bolts ...



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Fig. Fig. 6: ... then remove the oil pan-to-front cover bolts



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Fig. Fig. 7: Use a small prytool to separate the cover from the engine block ...



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Fig. Fig. 8: ... then pull the cover off of the engine block

  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. Replace in reverse order of the removal procedure. Replace the crankshaft oil seal. Use a new timing gear cover gasket.
  14.  

6-225 Engine

See Figure 9



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Fig. Fig. 9: Exploded view and identification of the front cover and timing chain system on the 6-225 engine

  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.
  10.  
  11. From the rear of the timing chain cover, coil new packing around the crankshaft hole in the cover so that the ends of the packing are at the top. Drive in the new packing with a punch. It will be necessary to ream out the hole to obtain clearance for the crankshaft vibration damper hub.
  12.  

6-226 Engine

Special tools are needed for this job.

  1. Drain the cooling system.
  2.  


CAUTION
When draining coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or 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 182 inch lbs. (20 Nm).
  16.  
  17. Install all other parts in reverse order of removal. Fill the cooling system.
  18.  

6-230 Engine

See Figures 10 and 11



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Fig. Fig. 10: Identification of the timing cover fasteners and related components used on the 6-230 engine



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Fig. Fig. 11: Make certain to tighten the timing cover retaining bolts in the proper sequence so that adequate sealing is maintained

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. Tighten the 5 / 16 in. bolts to 146-182 inch lbs. (16-20 Nm) and the 3 / 8 in. bolts to 15-20 ft. lbs. (20-27 Nm).
  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. Tighten the damper bolt to 100-130 ft. lbs. (136-177 Nm). If a damper lock is used, tighten the bolts to 40-50 ft. lbs. (54-68 Nm).
  30.  

 
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