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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 62 (Engine Mechanical) >> 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 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
    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 Sparkplug 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: Applying Compressed Air To J 22794
    GM310140Courtesy of GENERAL MOTORS CORP.
  6. Install J 22794  into the spark plug hole. See Special Tools .
  7. Attach an air hose to J 22794  . See Special Tools .
  8. Apply compressed air to J 22794  in order to hold the valves in place. See Special Tools .
    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. See Special Tools .
    10. Fig 5: View Of Cylinder Head Components
    GM1272854Courtesy of GENERAL MOTORS CORP.
  10. Remove the valve stem keys (225).
  11. Carefully release the valve spring tension.
  12. Remove the J 38606  . See Special Tools .
  13. Remove the valve spring cap (224).
  14. Remove the valve spring (223).
  15. Remove the valve stem oil seal and shim (222) assembly.
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