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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 995 (Engine Mechanical - 8.1L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Valve Stem Oil Seal and Valve Spring Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the valve rocker arms and pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .
    IMPORTANT: Rotate the piston in the cylinder being serviced to the bottom of its stroke, to ensure that the engine does not rotate when the compressed air is applied.
  2. Rotate the crankshaft until both valves are closed before installing the compressed air into the cylinder.
  3. Remove the spark plug from the cylinder being serviced. Refer to Spark Plug Replacement in Engine Controls - 8.1L.
    4. Fig 1: View Of Valve Rocker Arms
    GM470899Courtesy of GENERAL MOTORS CORP.
  4. Remove the valve stem keys as followed:
    1. Install the J 22794  into the spark plug hole.
    2. Apply compressed air into the cylinder in order to hold the valves closed.
    3. Lightly tap the valve spring cap to loosen the valve stem keys.
    4. Install the J 5892-D  to the cylinder head.
    5. Install the valve rocker arm nut.
      IMPORTANT: Tighten the valve rocker arm nut enough to hold J 5892-D  in place.
    6. Using J 5892-D  compress the valve spring.
    5. Fig 2: Compressing Valve Spring Using J 5892-D
    GM1964Courtesy of GENERAL MOTORS CORP.
  5. Remove the valve stem keys (1).
    IMPORTANT: Do not release the compressed air from the cylinder being worked on. The valve will fall into the cylinder bore.
  6. Slowly release the J 5892-D  .
  7. Remove the J 5892-D  from the cylinder head.
  8. Remove the valve spring cap (2) and valve spring (3).
  9. Remove the valve stem oil seal (4).
    10. Fig 3: View Of Valve Stem & Components
    GM677779Courtesy of GENERAL MOTORS CORP.
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