Seals and Gaskets: Service and Repair

Crankshaft Rear Oil Seal Replacement

^ Tools Required
- J 42841 Crankshaft Rear Oil Seal Remover
- J 45930 Crankshaft Rear Oil Seal Installer

Removal Procedure





1. Remove the flywheel.
2. Place the J 42841 on to the crankshaft.
3. Install the J 42841 retaining bolts.





4. Using a drill motor, variable speed preferred, with a socket adapter, install eight 25 mm (1.0 inch) self-drilling screws into the seal using the guide holes in the removal tool. When drilling, make sure you reduce the drill speed when the screw begins threading into the seal.





5. With all 8 removal screws installed, remove the J 42841 retaining bolts.





6. Install the center forcing screw.





7. Tighten the center screw on the removal too[ to pull the seal assembly off the end of the crankshaft.

Installation Procedure

Important: Make sure the drain is clear before installing the new crankshaft rear oil seal. Failure to clear the drain could cause the crankshaft rear oil seal to leak.





1. Clean any debris from the crankshaft rear oil seal drain (1) using wire or an unbound plastic tie-wrap (2).
2. Place a small amount of Gasket Maker, GM P/N 1052942 (Canadian P/N 10953466) or equivalent, at the crankcase split line across the end of the upper/lower crankcase seal.





3. Coat the outer diameter of the cylinder block crankshaft rear oil seal area with clean engine oil GM P/N 12345501 (Canadian P/N 992704) or equivalent.

Important: DO NOT allow any engine oil on the area where the crankshaft rear oil seal is to be pressed onto the crankshaft. The green coating pre-applied to the inner diameter of the crankshaft rear oil seal must not be contaminated.

4. Wipe the outer diameter of the flywheel flange clean with a lint-free cloth.

Important: DO NOT put any engine oil on the green coating pre-applied to the inner diameter of the crankshaft rear oil seal. This coating is a sealant that must not be contaminated.

5. Lubricate the outer rubber surface (1) of the crankshaft rear oil seal with clean engine oil GM P/N 12345501 (Canadian P/N 992704) or equivalent.





6. Loosen the center bolt of the J 45930 until the center hub protrudes approximately 13 mm (0.5 inch) beyond the outer plate. It is not necessary to completely unthread the center bolt and separate the 2 pieces of the J 45930.
7. Install the J 45930 to the rear of the crankshaft.





8. Thread the 3 mounting bolts into the crankshaft flange.
9. Tighten the bolts until the J 45930 is firmly mounted on the crankshaft.





10. Install the crankshaft rear oil seal by tightening the center bolt until the J 45930 bottoms against the crankcase.
11. Loosen the center bolt to release pressure on the crankcase.





12. Loosen the. 3 mounting bolts.
13. Remove the' J 45930 from the crankshaft flange.
14. Inspect to ensure the installation depth is equal around the crankshaft rear oil seal's circumference.
If the depth is not equal reinstall the J 45930 and repeat the installation procedures.
15. Install the flywheel.