127. Crankshaft Rear Oil Seal Installation

Crankshaft Rear Oil Seal Installation

^ Tools Required
- J 45930-A Crankshaft Rear Oil Seal Installer





1. Important: Crankshaft rear oil seal and engine flywheel installation requires adequate space for installation. If the engine stand does not allow suitable space to use the J 45930-A install the crankshaft rear oil seal and engine flywheel with the engine properly supported on the floor or on a bench. Clean any debris from the crankshaft rear oil seal drain (1) using wire or an unbound plastic tie-wrap (2).

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.

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.

4. 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.

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





5. 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.

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. Install the proper sized bolts into the J 45930-A that match the threads in the crankshaft flange.

7. Important: It is not necessary to completely unthread the center bolt and separate the two pieces of the J 45930-A .

Adjust the center bolt of the J 45930-A until the center hub protrudes approximately one-half inch beyond the outer plate.





8. Install the J 45930-A to the rear of the crankshaft.





9. Thread the mounting bolts into the crankshaft flange.
10. Tighten the mounting bolts until the J 45930-A is firmly mounted on the crankshaft.





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





13. Loosen the mounting bolts.
14. Remove the J 45930-A from the crankshaft flange.
15. 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-A and repeat the installation procedures.