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Cleaning and Inspection

WARNING: This page is about a different variant/trim than selected.
    Fig 1: View Of Carbon Removal Using J 8089
    GM4957Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to Safety Glasses Caution .
    IMPORTANT:
    • When cleaning a cylinder head in a thermal type oven, do not exceed 204°C (400°F).
    • Be careful not to scuff the chamber.
  1. Clean the following components:
    • Use the J 8089  in order to remove the carbon from the combustion chambers. See Special Tools .
    • Gasket surfaces

      Refer to Replacing Engine Gaskets  .

    • Valve stems and heads on a buffing wheel
    • Bolt hole threads

      Remove all dirt, debris, or threadlocking material from the bolt holes.

  2. Inspect the cylinder head for the following conditions:
    1. Cracks in the exhaust ports and combustion chambers
    2. External cracks in the water chambers
    3. Gasket surfaces for excessive scratches or gouging

      Refer to Replacing Engine Gaskets  .

    4. Bolt hole threads for debris or damaged threads

      Refer to Thread Repair  or Thread Repair Specifications  .

    3. Fig 2: Inspecting Cylinder Head For Warpage
    GM1552456Courtesy of GENERAL MOTORS CORP.
  3. Inspect the cylinder head for warpage. Refer to Engine Mechanical Specifications .
    4. Fig 3: Measuring Valve Spring Tension
    GM4960Courtesy of GENERAL MOTORS CORP.
  4. Use the J 9666  in order to measure the valve spring tension. Refer to Engine Mechanical Specifications .
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