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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1497 (Engine Mechanical - 4.2L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Camshaft Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the camshaft cover. Refer to CAMSHAFT COVER REPLACEMENT   .
  2. Remove the intake and the exhaust camshaft sprocket bolts.
  3. Install the J 44222  onto the cylinder head and adjust the horizontal bolts into the camshaft sprockets in order to maintain chain tension and keep from disturbing the timing chain components.
  4. Carefully move the sprockets with the timing chain, off of the camshafts.
  5. Remove the camshaft cap bolts.
    Fig 1: Installing Camshaft Sprocket Holding Tool Onto Cylinder Head
    G02128574Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Place the camshaft caps in a rack to ensure the caps are installed in the same location from which they were removed.
  6. Remove the camshaft caps and store.
    Fig 2: Removing Camshaft Caps
    G02128575Courtesy of GENERAL MOTORS CORP.
  7. Remove the camshafts.
    Fig 3: Removing Camshafts
    G02128576Courtesy of GENERAL MOTORS CORP.
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