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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1063 (Engine Mechanical - 4.3L) >> Repair Instructions - On Vehicle >> Crankshaft Rear Oil Seal Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2008 GMC Sierra and 2008 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Installing Crankshaft Rear Oil Seal Using J 35621-B
    GM334550Courtesy of GENERAL MOTORS CORP.
  1. Apply 2 to 3 drops of clean engine oil to the bore of the housing.
  2. Apply 2 to 3 drops of clean engine oil to the outside diameter of the engine flywheel pilot flange.
  3. Apply 1 drop of clean engine oil to the outside diameter of the flywheel locator pin.
  4. Apply 2 to 3 drops of clean engine oil to the crankshaft seal surface.
    5. Fig 2: Identifying Crankshaft Rear Oil Seal
    GM1700105Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Notice the direction of the rear oil seal. The new design seal is a reverse style as opposed to what has been used in the past. THIS SIDE OUT has been stamped into the seal as shown in the graphic.
  5. Inspect the J 35621-B  flange for imperfections that may damage the NEW seal. See Special Tools .

    Minor imperfections may be removed with a fine grade emery cloth.

    6. IMPORTANT: DO NOT allow oil or any other lubricants to contact the seal lip surface of the seal.
  6. Remove the sleeve from the seal.
  7. Apply 2 to 3 drops of clean engine oil to the outside diameter of the seal.
  8. Install the seal onto the J 35621-B  . See Special Tools .
  9. Install the J 35621-B  onto the rear of the crankshaft and hand tighten the tool bolts until snug. See Special Tools .
    10. NOTE: Proper alignment of the crankshaft rear oil seal is critical. Install the crankshaft rear oil seal near to flush and square to the crankshaft rear oil seal housing. Failing to do so may cause the crankshaft rear oil seal or the crankshaft rear oil seal installation tool to fail.
  10. Install the seal onto the crankshaft and into the housing:
    1. Turn the J 35621-B  wing nut clockwise until the seal is installed close to flush and square to the housing. See Special Tools .

      Increased resistance will be felt when the seal has reached the bottom of the housing bore.

    2. Turn the J 35621-B  wing nut counterclockwise to release the J 35621-B  from the seal. See Special Tools .
  11. Remove the J 35621-B  . See Special Tools .
  12. Wipe off any excess engine oil with a clean rag.
  13. Install the engine flywheel. Refer to Engine Flywheel Replacement .
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