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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 419 (Engine Mechanical - 3.5L (On-Vehicle)) >> Repair Instructions >> Camshaft 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 camshaft cover. Refer to Camshaft Cover Replacement - Left .

    Important:  You must install the J 42038 immediately after can cover removal. The J 42038 prevents unexpected camshaft rotation caused by valve spring pressure.

  2. Install the J 42038 on to the left camshafts. When installed properly the J 42038 will be fully seated on the camshaft ends with the camshaft flats parallel to the cam cover sealing surface.
  3. Remove the camshaft sprocket bolts.
    Fig 1: Identifying J 42038
    G01816858Courtesy of GENERAL MOTORS CORP.
  4. Install the J 42042 on to the left cylinder head.
  5. Evenly slide the secondary drive chain and camshaft sprockets off the camshafts on to the J 42042.
    Fig 2: Installing J 42042 On Left Cylinder Head
    G01816859Courtesy of GENERAL MOTORS CORP.
  6. Observe the markings on the bearing caps. Each bearing cap is marked in order to identify its location. The markings have the following meanings:
    • The raised feature must always be oriented toward the outboard of the engine.
    • The "l" indicates the intake camshaft.
    • The "E" indicates the exhaust camshaft.
    • The number indicates the journal position from the front of the engine.
    Fig 3: Identifying Bearing Cap Markings
    G01816860Courtesy of GENERAL MOTORS CORP.
  7. Remove the camshaft bearing cap retaining bolts.
  8. Remove the camshaft bearing caps. The cap closest to the front of the engine is the thrust cap and must not be installed in another location.
  9. Remove the J 42038 from the left camshafts. Allow the camshaft lobes to find a neutral position by rotating each camshaft, if necessary. DO NOT rotate the camshafts more than 10 degrees.
    Fig 4: Removing Camshaft Bearing Caps
    G01816861Courtesy of GENERAL MOTORS CORP.
  10. Lift the camshaft (1 or 2) out of the cylinder head.
  11. Clean and inspect the camshaft. Refer to CAMSHAFT CLEANING AND INSPECTION in Engine Mechanical-3.5L Unit Repair.
  12. Cover the camshaft with an oil soaked towel in order to prevent corrosion
    Fig 5: Removing Camshafts
    G01816862Courtesy of GENERAL MOTORS CORP.
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