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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 257 (Engine Mechanical - 4.0L (On-Vehicle)) >> Repair Instructions >> Secondary Camshaft Drive Chain 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 camshaft position sensor. Refer to CAMSHAFT POSITION SENSOR .
  3. Remove the right camshaft cover. Refer to Camshaft Cover Replacement - Right .
  4. Ensure both camshaft sprocket drive pins are at the top of their rotation.
    Fig 1: Identifying Sprocket Drive Pins At Top Rotation
    G01819336Courtesy 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
  5. Install the J 44212  over the camshafts.
    Fig 2: Installing J 44212
    G01819337Courtesy of GENERAL MOTORS CORP.
  6. Remove the mechanics wire (1) supporting the right secondary camshaft drive chain shoe (3).
  7. Remove the engine front cover bolt (2) from the front of the engine.
    Fig 3: Removing Mechanics Front Cover Bolt & Wire Supporting Right Secondary Camshaft Drive Chain Shoe
    G01819338Courtesy of GENERAL MOTORS CORP.
  8. 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
    G01819339Courtesy of GENERAL MOTORS CORP.
  9. Remove the right exhaust camshaft sprocket bolt.
    10. Fig 5: Removing Right Exhaust Camshaft Sprocket Bolt
    G01819340Courtesy of GENERAL MOTORS CORP.
  10. Slide the right exhaust camshaft sprocket off of the camshaft and remove the right secondary camshaft drive chain from the camshaft sprocket teeth.
  11. Lift the right secondary camshaft drive chain from the camshaft intermediate drive shaft sprocket teeth.
  12. Remove the right secondary camshaft drive chain from the engine.
    Fig 6: Removing Right Secondary Camshaft Drive Chain
    G01819341Courtesy of GENERAL MOTORS CORP.
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