Tools Required

J 41479  Crankshaft Rear Oil Seal Installer. See Special Tools .

IMPORTANT:
• The flywheel spacer, if applicable, must be removed prior to oil seal installation.
• Do not lubricate the oil seal inside diameter (ID) or the crankshaft surface.
• Do not use the crankshaft rear oil seal again.
Fig 1: View Of Crankshaft Rear Oil Seal
Courtesy of GENERAL MOTORS CORP.
1. Lubricate the outside diameter (OD) of the oil seal (141) with clean engine oil.

   DO NOT allow oil or other lubricants to contact the seal surface.

2. Lubricate the rear cover oil seal bore with clean engine oil.

   DO NOT allow oil or other lubricants to contact the crankshaft surface.

3. Install the J 41479  cone (2) and bolts onto the rear of the crankshaft. See Special Tools .
4. Tighten the bolts until snug. Do not overtighten.
5. Install the rear oil seal onto the tapered cone (2) and push the seal to the rear housing bore.
   Fig 2: Installing Crankshaft Rear Oil Seal Using J 41479

   Courtesy of GENERAL MOTORS CORP.
6. Thread the J 41479  threaded rod into the tapered cone until the tool (1) contacts the oil seal. See Special Tools .
7. Align the oil seal onto the tool (1).
8. Rotate the handle of the tool (1) clockwise until the seal enters the rear housing and bottoms into the housing bore.
9. Remove the tool.