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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 165 (Engine Mechanical - 4.0L (On-Vehicle)) >> Repair Instructions >> Secondary Camshaft Drive Chain Guide Replacement - Left >> 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 left secondary camshaft drive chain tensioner. Refer to Secondary Camshaft Drive Chain Tensioner Replacement - Left .
  2. Remove the left camshaft cover. Refer to Camshaft Cover Replacement - Left .
  3. Ensure both camshaft sprocket drive pins are at the top of their rotation.
    Fig 1: Identifying Sprocket Drive Pins At Top Rotation
    G01819382Courtesy 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
    G01819383Courtesy of GENERAL MOTORS CORP.
  5. 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 3: Using Open End Wrench On Hex Cast
    G01819384Courtesy of GENERAL MOTORS CORP.
  6. Remove the left exhaust camshaft sprocket bolt.
  7. Slide the left exhaust camshaft sprocket off of the camshaft and remove the left secondary drive chain from the camshaft sprocket teeth.
    Fig 4: Removing Left Exhaust Camshaft Sprocket
    G01819385Courtesy of GENERAL MOTORS CORP.
  8. Remove the left secondary camshaft drive chain guide access plug (4) located in the cylinder head. Ensure the O-ring seal remains attached to the access plug.
    Fig 5: Removing Left Secondary Camshaft Drive Chain Guide Access Plug
    G01819386Courtesy of GENERAL MOTORS CORP.
  9. Remove the upper left secondary camshaft drive chain guide bolt.
    Fig 6: Removing Upper Left Secondary Camshaft Drive Chain Guide Bolt
    G01819387Courtesy of GENERAL MOTORS CORP.
  10. Remove the lower left secondary camshaft drive chain guide bolt.
    Fig 7: Removing Lower Left Secondary Camshaft Drive Chain Guide Bolt
    G01819388Courtesy of GENERAL MOTORS CORP.
  11. Remove the left secondary camshaft drive chain guide.
    Fig 8: Remove Left Secondary Camshaft Drive Chain Guide
    G01819389Courtesy of GENERAL MOTORS CORP.
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