GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 Sierra Classic - 4WD 🢒 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: 1272844 Size: SH
  1. Remove the engine flywheel. Refer to Engine Flywheel Replacement .
  2. Remove the crankshaft rear oil seal (141) from the rear housing.

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. Install a NEW oil seal.


    Object Number: 1699207 Size: SH

    Important: Note the installation direction of the oil seal. The new design oil seal is a reverse lip type seal. For proper orientation, THIS SIDE OUT has been marked on the seal.

  1. Lubricate the outside diameter (OD) of the oil seal with clean engine oil.
  2. Inspect the seal and identify the THIS SIDE OUT markings for proper orientation.
  3. Lubricate the rear housing oil seal bore with clean engine oil.

    4. Object Number: 63200 Size: SH
  4. Install the J 41479 tapered cone (2) and bolts onto the rear of the crankshaft.
  5. Tighten the bolts until snug. Do not overtighten.
  6. Install the rear oil seal onto the tapered cone (2) and push the seal to the rear cover bore. Install the oil seal with the markings THIS SIDE OUT facing away from the engine.
  7. Thread the J 41479 threaded rod into the tapered cone until the tool (1) contacts the oil seal.
  8. Align the oil seal into the tool (1).
  9. Rotate the handle of the tool (1) clockwise until the seal enters the rear cover and bottoms into the cover bore.
  10. Remove the J 41479 .
  11. 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: 1272844 Size: SH
  1. Remove the torque converter locator bushing. Refer to Torque Converter Locator Bushing Replacement .
  2. Remove the crankshaft rear oil seal (141) 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. Install a NEW oil seal.


    Object Number: 1699207 Size: SH

    Important: Note the installation direction of the oil seal. The new design oil seal is a reverse lip type seal. For proper orientation, THIS SIDE OUT has been marked on the seal.

  1. Lubricate the outside diameter (OD) of the oil seal with clean engine oil.
  2. Inspect the seal and identify the THIS SIDE OUT markings for proper orientation.
  3. Lubricate the rear housing oil seal bore with clean engine oil.

    4. Object Number: 63200 Size: SH
  4. Install the J 41479 tapered cone (2) and bolts onto the rear of the crankshaft.
  5. Tighten the bolts until snug. Do not overtighten.
  6. Install the rear oil seal onto the tapered cone (2) and push the seal to the rear cover bore. Install the oil seal with the markings THIS SIDE OUT facing away from the engine.
  7. Thread the J 41479 threaded rod into the tapered cone until the tool (1) contacts the oil seal.
  8. Align the oil seal into the tool (1).
  9. Rotate the handle of the tool (1) clockwise until the seal enters the rear cover and bottoms into the cover bore.
  10. Remove the J 41479 .
  11. Install the torque converter locator bushing. Refer to Torque Converter Locator Bushing Replacement .