Tools Required

J 45930  Crankshaft Rear Oil Seal Installer. See Special Tools .

Fig 1: Cleaning Debris From Crankshaft Rear Oil Seal Drain
Courtesy of GENERAL MOTORS CORP.
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  install the crankshaft rear oil seal and engine flywheel with the engine properly supported on the floor or on a bench. See Special Tools .
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.
Fig 2: Lubricating Crankshaft Rear Oil Seal
Courtesy of GENERAL MOTORS CORP.
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. Install the proper sized bolts into the J 45930  that match the threads in the crankshaft flange. See Special Tools .
IMPORTANT: It is not necessary to completely unthread the center bolt and separate the two pieces of the J 45930  . See Special Tools .
7. Adjust the center bolt of the J 45930  until the center hub protrudes approximately one-half inch beyond the outer plate. See Special Tools .
Fig 3: Installing J 45930
Courtesy of GENERAL MOTORS CORP.
8. Install the J 45930  to the rear of the crankshaft. See Special Tools .
Fig 4: Adjusting Mounting Bolts
Courtesy of GENERAL MOTORS CORP.
9. Thread the mounting bolts into the crankshaft flange.
10. Tighten the mounting bolts until the J 45930  is firmly mounted on the crankshaft. See Special Tools .
Fig 5: Installing Crankshaft Rear Oil Seal
Courtesy of GENERAL MOTORS CORP.
11. Install the crankshaft rear oil seal by tightening the center bolt until the J 45930  bottoms against the crankcase. See Special Tools .
12. Loosen the center bolt to release pressure on the crankcase.
Fig 6: Adjusting Mounting Bolts
Courtesy of GENERAL MOTORS CORP.
13. Loosen the mounting bolts.
14. Remove the J 45930  from the crankshaft flange. See Special Tools .
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  and repeat the installation procedures. See Special Tools .