GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2005 🢒 GMC C Sierra - 2WD 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, and 6.0L 🢒 Crankshaft Rear Oil Seal Replacement

Crankshaft Rear Oil Seal Replacement 4.8L, 5.3L, and 6.0L Engines

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: 

   • 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 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.

  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 the 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 the 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 the J 41479 .
  10. Install the engine flywheel. Refer to Engine Flywheel Replacement .

Crankshaft Rear Oil Seal Replacement 5.3L Engine w/RPO HP2

Tools Required

    • J 41479 Crankshaft Rear Oil Seal Installer
    • J 41479-2A Crankshaft Rear Oil Seal Installation Guide

Removal Procedure

    Object Number: 490692 Size: SH
  1. Remove the torque converter locator bushing. Refer to Torque Converter Locator Bushing Replacement .
  2. Remove the crankshaft rear oil seal (1) from the rear cover.

Installation Procedure

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 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.

  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: 1201554 Size: SH
  3. Install the J 41479-2A 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 J 41479-2A tapered cone (2) and push the seal to the rear cover bore.
  6. Thread the J 41479 threaded rod into the J 41479-2A tapered cone (2) until the tool (1) contacts the oil seal.
  7. Align the oil seal to the J 41479 (1).
  8. Rotate the handle of the J 41479 (1) clockwise until the seal enters the rear cover and bottoms into the cover bore.
  9. Remove the J 41479 andJ 41479-2A .
  10. Install the torque converter locator bushing. Refer to Torque Converter Locator Bushing Replacement .