Rear Oil Seal (Early)
Crankshaft Rear Oil Seal Replacement (Early)^ Tools Required
- J 42841 Crankshaft Rear Oil Seal Remover
- J 42842 Crankshaft Rear Oil Seal Installer
Removal Procedure
1. Remove the flywheel.
2. Place the J42841 on to the crankshaft.
3. Install the J42841 retaining bolts.
4. Using a drill motor (variable speed preferred) with a socket adapter, install eight one-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 eight removal screws installed, remove the J42841 retaining bolts.
6. Install the center screw to the J42841.
7. Tighten the center screw on the J42841 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. Coat the outer diameter of the cylinder block crankshaft rear oil seal area (1) with clean engine oil GM P/N 12345501 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.
3. 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.
4. Lubricate the outer rubber surface of the crankshaft rear oil seal with clean engine oil GM P/N 12345501 or equivalent.
5. Loosen the center bolt of the J 42842 until the center hub protrudes approximately one-half inch beyond the outer plate. It is not necessary to completely unthread the center bolt and separate the two pieces of the J 42842.
6. Place the J 42842 on to the crankshaft.
7. Thread the 3 mounting bolts into the crankshaft flange.
8. Tighten the bolts until the J 42842 is firmly mounted on the crankshaft.
9. Install the crankshaft rear oil seal by tightening the center bolt until the J 42842 bottoms against the crankcase.
10. Loosen the center bolt to release pressure on the crankcase.
11. Loosen the 3 mounting bolts.
12. Remove the J 42842 from the crankshaft flange.
13. 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 42842 and repeat the installation procedures.
14. Install the flywheel.