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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 257 (Engine Mechanical - 4.0L (On-Vehicle)) >> Repair Instructions >> Secondary Camshaft Drive Chain Guide Replacement - Right >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the right secondary camshaft drive chain tensioner. Refer to Secondary Camshaft Drive Chain Tensioner Replacement - Right .
  2. Remove the right camshaft cover. Refer to Camshaft Cover Replacement - Right .
  3. Ensure both camshaft sprocket drive pins are at the top of their rotation.
    Fig 1: Identifying Sprocket Drive Pins At Top Rotation
    G01819398Courtesy of GENERAL MOTORS CORP.
    WARNING: The camshaft holding tools must be installed on the camshafts to prevent camshaft rotation. When performing service to the valve train and/or timing components, valve spring pressure can cause the camshafts to rotate unexpectedly and can cause personal injury
  4. Install the J 44212  over the camshafts.
    Fig 2: Installing J 44212
    G01819399Courtesy of GENERAL MOTORS CORP.
  5. Remove the mechanics wire (1) supporting the right secondary camshaft drive chain shoe (3).
  6. Remove the engine front cover bolt (2) from the front of the engine.
    Fig 3: Removing Mechanics Wire Around Right Secondary Camshaft Drive Chain Shoe & Front Cover Bolt
    G01819400Courtesy of GENERAL MOTORS CORP.
  7. Use an open end wrench on the hex cast into the camshaft in order to prevent the camshaft from rotating when removing the camshaft sprocket bolt.
    Fig 4: Using Open End Wrench On Hex Cast
    G01819401Courtesy of GENERAL MOTORS CORP.
  8. Remove the right intake camshaft sprocket bolt.
  9. Slide the right intake camshaft sprocket off of the camshaft and remove the right secondary drive chain from the camshaft sprocket teeth.
    Fig 5: Removing Right Intake Camshaft Sprocket
    G01819402Courtesy of GENERAL MOTORS CORP.
  10. Remove the right secondary camshaft drive chain guide access plug (2) located in the cylinder head. Ensure the O-ring seal remains attached to the access plug.
    Fig 6: Removing Right Secondary Camshaft Drive Chain Guide Access Plug
    G01819403Courtesy of GENERAL MOTORS CORP.
  11. Remove the upper right secondary camshaft drive chain guide bolt.
    Fig 7: Removing Upper Right Secondary Camshaft Drive Chain Guide Bolt
    G01819404Courtesy of GENERAL MOTORS CORP.
  12. Remove the lower right secondary camshaft drive chain guide bolt.
    Fig 8: Removing Lower Right Secondary Camshaft Drive Chain Guide Bolt
    G01819405Courtesy of GENERAL MOTORS CORP.
  13. Remove the right secondary camshaft drive chain guide.
    Fig 9: Removing Right Secondary Camshaft Drive Chain Guide
    G01819406Courtesy of GENERAL MOTORS CORP.
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