GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2006 🢒 Yukon Denali 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, and 6.0L 🢒 Crankshaft Rear Oil Seal Installation

Tools Required

J 41479 Crankshaft Rear Oil Seal Installer


    Object Number: 1272844 Size: SH

    Important: 

       • Do not lubricate the oil seal inside diameter (ID) or the crankshaft surface.
       • Do not use the crankshaft rear oil seal again.

  1. Lubricate the outside diameter (OD) of the oil seal (141) with clean engine oil.

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

  2. Lubricate the rear housing 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 the J 41479 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 housing bore.
  6. Thread the J 41479 threaded rod into the tapered cone until the tool (1) contacts the oil seal.
  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.