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).
   Fig 1: Cleaning Crankshaft Rear Oil Seal Drain

   Courtesy of GENERAL MOTORS CORP.
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.
   Fig 2: Identifying Crankshaft Rear Oil Seal Lubrication Area

   Courtesy of GENERAL MOTORS CORP.
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.
   Fig 3: Installing J 42842

   Courtesy of GENERAL MOTORS CORP.
7. Thread the 3 mounting bolts into the crankshaft flange.
8. Tighten the bolts until the J 42842  is firmly mounted on the crankshaft.
   Fig 4: Tightening J 42842

   Courtesy of GENERAL MOTORS CORP.
9. Install the crankshaft rear oil seal by tightening the center bolt until the J 42842  bottoms against the crankcase.
Fig 5: Tightening J 42842 Center Bolt
Courtesy of GENERAL MOTORS CORP.
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. Refer to Engine Flywheel Replacement .