01-05-2011, 09:48 PM
Join Date: Sep 2010
Location: Wahiawa, HI
Rear main seal replacement
Looking to replace the rear main seal on my '88 yj. Engine is a stock I6 4.2l. Looking for any help I can get. Have a Chiltons that I will be referencing but it looks unpleasant. Instructions in the Chiltons are as follows
This seal is a two piece neoprene type with a single lip.
1. Raise and support the vehicle on jackstands. (probably going to put it on a lift).
2. Remove the oil pan.
3. Remove the rear main bearing cap and discard the lower seal.
4. Using a center punch, carefully drive the upper half of the seal out of the block just far enough to grab with pliers and pull out.
5. Remove the oil pan front and rear seals and the side gaskets.
6. Clean all gasket surfaces.
7. Wipe clean the sealing surface of the crankshaft and coat it lightly with engine oil.
8. Coat the lip of the upper seal with engine oil and install it in the block. The lip faces forward.
9. Place the lower half of the seal into the bearing cap.
10. Coat the outer curved surface of the seal with liquid soap. Coat the seal lip with engine oil.
11. Install the lower seal into the cap, pressing firmly. Be sure the seal is flush with the cylinder block pan rail.
12. Apply loctite 515 or equivalent to the rear bearing cap. The bead should be 3.0mm thick.
Now I don't know how to remove the oil pan or rear main bearing cap. Guessing I have to drain it first then pull it. If anyone has done this and has any tips or anything that would help I would greatly appreciate it.