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Home >> Chevrolet >> 2004 >> Avalanche 2500 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Mechanical (Repair Instructions -- 1 Of 3) -- 4.8L, 5.3L & 6.0L) >> Repair Instructions (On-Vehicle & Off-Vehicle - Part 1) >> On-Vehicle Repair Instructions >> Valve Stem Oil Seal and Valve Spring Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
  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 1: View Of Spark Plug Wire & Boot
    GM343699Courtesy 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 2: View Of Spark Plug And Sparkplug Seat
    GM14824Courtesy of GENERAL MOTORS CORP.
  6. Install the J 22794  into the spark plug hole.
  7. Attach an air hose to the J 22794  .
  8. Apply compressed air to the J 22794  in order to hold the valves in place.
    9. Fig 3: Installing J 22794 Into Spark Plug Hole
    GM310140Courtesy of GENERAL MOTORS CORP.
  9. Use the J 38606  in order to compress the valve spring.
    10. Fig 4: Compress The Valve Spring (Cylinder Head Installed) Using Special Tools
    GM218211Courtesy of GENERAL MOTORS CORP.
  10. Remove the valve stem keys (2).
  11. Carefully release the valve spring tension.
  12. Remove the J 38606  .
  13. Remove the valve spring cap (3).
  14. Remove the valve spring (4).
  15. Remove the valve stem oil seal and shim (1, 5)
    16. Fig 5: View Of Valve Stem & Valve Spring Components
    GM832259Courtesy of GENERAL MOTORS CORP.
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