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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1019 (Engine Mechanical - 4.8L, 5.3L & 6.0L (Repair Instructions - 1 Of 3)) >> Repair Instructions (On-Vehicle & Off-Vehicle - Part 1) >> On-Vehicle Repair Instructions >> Crankshaft Front Oil Seal Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
  • Do not lubricate the oil seal sealing surface.
  • Do not reuse the crankshaft oil seal.
  1. Lubricate the outer edge of the oil seal (1) with clean engine oil.
    2. Fig 1: View Of Crankshaft Front Oil Seal
    GM490689Courtesy of GENERAL MOTORS CORP.
  2. Lubricate the front cover oil seal bore with clean engine oil.
  3. Install the crankshaft front oil seal onto the J 41478  guide.
  4. Install the J 41478  threaded rod (with nut, washer, guide, and oil seal) into the end of the crankshaft.
    5. Fig 2: Installing The Crankshaft Front Oil Seal Using J 41478
    GM63177Courtesy of GENERAL MOTORS CORP.
  5. Use the J 41478  in order to install the oil seal into the cover bore.
    1. Use a wrench and hold the hex on the installer bolt.
    2. Use a second wrench and rotate the installer nut clockwise until the seal bottoms in the cover bore.
    3. Remove the J 41478  .
    4. Inspect the oil seal for proper installation.

      The oil seal should be installed evenly and completely into the front cover bore.

  6. Install the crankshaft balancer. Refer to Crankshaft Balancer Replacement (4.8L, 5.3L, and 6.0L Engines)  or Crankshaft Balancer Replacement (5.3L Engine w/RPO HP2) .
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