GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 TrailBlazer - 2WD 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L 🢒 Crankshaft Rear Oil Seal Replacement

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. Remove the crankshaft rear oil seal (1) from the rear cover.

Installation Procedure

Important: 

   • Remove the flywheel spacer, if applicable, prior to oil seal installation.
   • Do not lubricate the oil seal inside diameter or the crankshaft surface.
   • Do not reuse the crankshaft rear oil seal.


    Object Number: 490692 Size: SH
  1. Lubricate the outside diameter of the oil seal (1) with clean engine oil.

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

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

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


    Object Number: 63200 Size: SH
  3. Install J 41479 tapered cone (2) and bolts onto the rear of the crankshaft.
  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 cover bore.
  6. Thread J 41479 threaded rod into the tapered cone until the tool (1) contacts the oil seal.
  7. Align the oil seal into the tool (1).
  8. Rotate the handle of the tool (1) clockwise until the seal enters the rear cover and bottoms into the cover bore.
  9. Remove J 41479 .
  10. Install the engine flywheel. Refer to Engine Flywheel Replacement.