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Home >> Pontiac >> 2007 >> Solstice GXP, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Mechanical - 2.4L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Cylinder Head Cleaning and Inspection >> Cylinder Head and Gasket Surface Cleaning and Inspection

Cylinder Head and Gasket Surface Cleaning and Inspection

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Spark Plugs
    GM1403898Courtesy of GENERAL MOTORS CORP.
  1. Remove the spark plugs.
  2. Inspect the cylinder head gasket and mating surfaces for leaks, corrosion and blow-by. If the gasket has failed, use the following faults to determine the cause:
    1. Improper installation
    2. Loose or warped cylinder head
    3. Missing, off location or not fully seated dowel pins
    4. Corrosion in the seal area around the coolant passages
    5. Chips or debris in the cylinder head bolt holes
    6. Bolt holes in the cylinder block not drilled or tapped deep enough
    3. Fig 2: Locating Combustion Chambers
    GM415011Courtesy of GENERAL MOTORS CORP.
  3. Inspect the cylinder head gasket surface.
    • Cylinder head may be reused if corrosion is found only outside a 4 mm (0.375 in) band around each combustion chamber (1).
    • Replace the cylinder head if the area between the valve seats is cracked (2).
    • Replace the cylinder head if corrosion has been found inside a 4 mm (0.375 in) band around each combustion chamber (3).
  4. Clean the cylinder head bolts.
    5. IMPORTANT: Do not use a wire brush on any gasket sealing surface.
  5. Clean the cylinder head. Remove all varnish, soot and carbon to the bare metal.
  6. Clean the valve guides.
  7. Clean the threaded holes. Use a nylon bristle brush.
  8. Clean the remains of the sealer from the plug holes.
  9. Inspect the cylinder head bolts for damaged threads or stretching and damaged heads caused by improper use of tools.
  10. Replace all suspect bolts.
  11. Inspect the cylinder head for cracks. Check between the valve seats and in the exhaust ports.
    12. IMPORTANT: Do not attempt to weld the cylinder head, replace it.
  12. Inspect the cylinder head deck for corrosion, sand inclusions and blow holes.
    13. Fig 3: Inspecting Cylinder Head Surfaces For Flatness
    GM63062Courtesy of GENERAL MOTORS CORP.
  13. Inspect the cylinder head deck surface for flatness. Refer to Engine Mechanical Specifications for 2.0L or Engine Mechanical Specifications  for 2.4L.

    If the cylinder head is out of specification, replace the cylinder head. Do not machine the cylinder head.

  14. Inspect all the threaded holes for damage. Threads may be reconditioned with thread inserts.
  15. Inspect the sealing surfaces.
    16. Fig 4: View Of Cylinder Head Plugs
    GM412478Courtesy of GENERAL MOTORS CORP.
  16. Inspect the cylinder head plugs.
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