GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 41479 Crankshaft Rear Oil Seal Installer

Removal Procedure


    Object Number: 490692  Size: SH
  1. Remove the engine flywheel. Refer to Engine Flywheel Replacement .
  2. Gently pry the crankshaft rear oil seal (1) from the rear cover.
  3. Clean and inspect the engine rear cover. Refer to Engine Rear Cover Cleaning and Inspection in Engine Mechanical - 5.7 L Unit Repair.

Installation Procedure

Important: 

   • Do not lubricate the oil seal inside diameter (ID) of the crankshaft surface.
   • Do not reuse the crankshaft rear oil seal.


    Object Number: 490692  Size: SH
  1. Lubricate the outside diameter (OD) of the oil seal (1) with clean engine oil.
  2. Do not allow oil or other lubricants to contact the seal surface.

  3. Lubricate the rear cover oil seal bore with clean engine oil.
  4. DO NOT allow oil or other lubricants to contact the crankshaft surface.


    Object Number: 63200  Size: SH
  5. Install the J 41479 cone (2) and bolts onto the rear of the crankshaft.
  6. Tighten the bolts until snug. Do not overtighten.
  7. Install the rear oil seal onto the tapered cone (2) and push the seal to the rear cover bore.
  8. Thread the J 41479 threaded rod into the tapered cone until the tool (1) contacts the oil seal.
  9. Align the oil seal onto the tool (1).
  10. Rotate the handle of the tool (1) clockwise until the seal enters the rear cover and bottoms out into the cover bore.
  11. Remove the J 41479 .
  12. Install the engine flywheel. Refer to Engine Flywheel Replacement .