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Home >> GMC >> 2011 >> Yukon Base, 5.3 3 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (Engine Mechanical - Hybrid (LZ1) - Repair Instructions - On Vehicle) >> Repair Instructions - On Vehicle >> Valve Stem Oil Seal and Valve Spring Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Spark Plug Wire And Boot
    GM343699Courtesy of GENERAL MOTORS CORP.
  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: Spark Plug And Spark Plug Seat
    GM14824Courtesy of GENERAL MOTORS CORP.
    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: Spark Plug Port Adapter
    GM310140Courtesy 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 4: Compressing Valve Spring
    GM218211Courtesy of GENERAL MOTORS CORP.
  9. Use the J 38606 in order to compress the valve spring.
    10. Fig 5: Valve, Stem Keys, Valve Spring Cap And Valve Spring
    GM1559870Courtesy of GENERAL MOTORS CORP.
  10. Remove the valve stem keys (225).
  11. Carefully release the valve spring tension.
  12. Remove the J 38606 .
  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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