Tools Required

J 42842  Crankshaft Rear Oil Seal Installer

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 42842  install the crankshaft rear oil seal and engine flywheel with the engine properly supported on the floor or on a bench.

1. Clean any debris from the crankshaft rear oil seal drain (1) using wire or an unbound plastic tie-wrap (2).

   Important:  Ensure that 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 United States 1052942, GM P/N Canada 10953466, or equivalent, at the crankcase split line across the end of the upper/lower crankcase seal.
   Fig 1: Cleaning Crankshaft Rear Oil Seal Drain

   Courtesy of GENERAL MOTORS CORP.
3. Coat the outer diameter of the cylinder block crankshaft rear oil seal area with clean engine oil GM P/N United States 12345501, GM P/N Canada 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 United States 12345501, GM P/N Canada 992704, or equivalent.

   Important:  It is not necessary to completely unthread the center bolt and separate the two pieces of the J 42842. 

6. Loosen the center bolt of the J 42842  until the center hub protrudes approximately 13 mm (0.50 in) beyond the outer plate.
   Fig 2: Identifying Crankshaft Rear Oil Seal Lubrication Area

   Courtesy of GENERAL MOTORS CORP.
7. Install the J 42842  to the rear of the crankshaft.
   Fig 3: Installing J 42842

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

   Courtesy of GENERAL MOTORS CORP.
10. Install the crankshaft rear oil seal by tightening the center bolt until the J 42842  bottoms against the crankcase.
11. Loosen the center bolt to release pressure on the crankcase.
    Fig 5: Installing Crankshaft Rear Oil Seal

    Courtesy of GENERAL MOTORS CORP.
12. Loosen the three mounting bolts.
13. Remove the J 42842  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 42842  and repeat the installation procedures.
    Fig 6: Removing J 42842

    Courtesy of GENERAL MOTORS CORP.