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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 487 (Engine Mechanical - 5.3L, 6.0L, 6.2L - Repair Instructions - On Vehicle) >> Repair Instructions - On Vehicle >> 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 COMPANY
  1. Remove the 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 COMPANY
    NOTE:

    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 COMPANY
  6. Install the J 22794  spark plug port adapter into the spark plug hole.
  7. Attach an air hose to the J 22794  spark plug port adapter.
  8. Apply compressed air to the J 22794  spark plug port adapter in order to hold the valves in place.
    9. Fig 4: Compress Valve Spring (Cylinder Head Installed) Using Special Tools
    GM218211Courtesy of GENERAL MOTORS COMPANY
  9. Use the J 38606  valve spring compressor in order to compress the valve spring.
    10. Fig 5: Valve Stem Keys, Valve Spring Cap & Valve Spring
    GM1559870Courtesy of GENERAL MOTORS COMPANY
  10. Remove the valve stem keys (225).
  11. Carefully release the valve spring tension.
  12. Remove the J 38606  valve spring compressor.
  13. Remove the valve spring cap (224).
  14. Remove the valve spring (223).
  15. Remove the valve stem oil seal (222).
  16. Remove the valve (228).
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