Jeep Wrangler/YJ 1987-1995 Repair Guide

Rear Main Oil Seal

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REPLACEMENT



2.5L Engine

See Figure 1

  1. Remove the transmission.
  2.  
  3. Remove the flywheel.
  4.  
  5. Pry out the seal from around the crankshaft flange.
  6.  

To install:
  1. Coat the inner lip of the new seal with clean engine oil.
  2.  
  3. Gently tap the new seal into place, flush with the block, using a rubber or plastic mallet.
  4.  



Click image to see an enlarged view

Fig. Fig. 1: Crankshaft oil seal location-2.5L, 4.0L and 4.2L engines

  1. Install the flywheel.
  2.  

New bolts MUST be used when installing the flywheel or torque converter plate. Tighten the new bolts to 50 ft. lbs. (68 Nm).

  1. Install the transmission.
  2.  

4.0L and 4.2L Engines

See Figures 1, 2 and 3

This seal is a two piece neoprene type with a single lip.

  1. Raise and support the vehicle on jackstands.
  2.  
  3. Remove the transmission.
  4.  
  5. Remove the flywheel or converter drive plate.
  6.  
  7. Remove the oil pan.
  8.  
  9. Remove the rear main bearing cap and discard the lower seal.
  10.  
  11. Using a center punch, carefully drive the upper half of the seal out of the block just far enough to graph with a pliers and pull out.
  12.  



Click image to see an enlarged view

Fig. Fig. 2: Rear main bearing cap (two-piece) oil seal-4.0L and 4.2L engines



Click image to see an enlarged view

Fig. Fig. 3: Location of Loctite 515® or equivalent-4.0L and 4.2L engines

  1. Remove the oil pan front and rear seals and the side gaskets.
  2.  

To install:
  1. Clean all gasket surfaces.
  2.  
  3. Wipe clean the sealing surface of the crankshaft and coat it lightly with engine oil.
  4.  
  5. Coat the lip of the upper seal with engine oil and install it in the block. The lip faces forward.
  6.  
  7. Place the lower half of the seal into the bearing cap.
  8.  
  9. Coat the outer curved surface of the seal with liquid soap. Coat the seal lip with engine oil.
  10.  
  11. Install the lower seal into the cap, pressing firmly. Be sure the seal is flush with the cylinder block pan rail.
  12.  
  13. Apply Loctite 515®, or equivalent to the rear bearing cap as illustrated. The bead should be 0.125 in. (3.0mm) thick.
  14.  


WARNING
Do not apply Loctite 515® or equivalent to the lip of the seal!

  1. Install the rear main cap.
  2.  
  3. Tighten all main bearing cap bolts gradually to 80 ft. lbs. (108 Nm).
  4.  
  5. Replace the oil pan.
  6.  
  7. Install the flywheel or converter drive plate.
  8.  

 
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