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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 421 (Engine Mechanical - 4.8L, 5.3L, & 6.0L (On-Vehicle)) >> Repair Instructions >> Valve Stem Oil Seal and Valve Spring Replacement >> Removal Procedure

Removal Procedure

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    Fig 1: View Of Spark Plug Wire & Boot
    GM343699Courtesy of GENERAL MOTORS CORP.
  1. Remove the valve rocker arm. Refer to Valve Rocker Arm and Push Rod Replacement .
  2. Disconnect the spark plug wire at the spark plug.
    • Twist each plug wire boot 1/2 turn.
    • Pull only on the boot in order to remove the wire from the spark plug.
    3. Fig 2: View Of Spark Plug And Spark Plug Seat
    GM14824Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Remove the spark plugs from the cylinder head with the engine at room temperature.
  3. Loosen the spark plug 1 or 2 turns.
  4. Brush or air blast away any dirt or debris from around the spark plug.
  5. Remove the spark plug.
    6. Fig 3: J 22794 At Spark Plug Hole
    GM310140Courtesy of GENERAL MOTORS CORP.
  6. Install J 22794  into the spark plug hole.
  7. Attach an air hose to J 22794  .
  8. Apply compressed air to J 22794  in order to hold the valves in place.
    9. Fig 4: Compress The Valve Spring (Cylinder Head Installed) Using Special Tools
    GM218211Courtesy of GENERAL MOTORS CORP.
  9. Use J 38606 in order to compress the valve spring.
    10. Fig 5: Valve Components
    GM721939Courtesy of GENERAL MOTORS CORP.
  10. Remove the valve stem keys (3).
  11. Carefully release the valve spring tension.
  12. Remove the J 38606 .
  13. Remove the valve spring cap (4).
  14. Remove the valve spring (5).
    IMPORTANT: A second design valve stem oil seal and shim may be used on later engines.
    A separate spring shim is not required with the second design seal and shim.
  15. Remove the valve stem oil seal (6) (first design).
  16. Remove the valve spring shim (7) (first design).
  17. Remove the valve stem oil seal and shim (2) (second design)
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