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Cylinder Head and Gasket Surface Cleaning and Inspection

WARNING: This page is about a different car, the 2018 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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
  2. Inspect the fuel injector bores and clean, if required. Refer to Fuel Injector and Fuel Injector Bore Cleaning and Inspection .
  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. Ensure proper use of room temperature vulcanizing (RTV) sealant. Properly clean all RTV surfaces, Refer to Use of Room Temperature Vulcanizing (RTV) and Anaerobic Sealant .
    5. NOTE:

    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. Remove any old thread sealant, gasket material or sealant using EN-28410  remover.
  7. Clean all cylinder head surfaces with non-corrosive solvent.
  8. Blow out all the oil galleries using compressed air.
  9. Clean any debris or build-up from the lifter pockets.
  10. Clean the valve guides.
  11. Clean the threaded holes. Use a nylon bristle brush.
  12. Clean the remains of the sealer from the plug holes.
  13. Inspect the cylinder head for cracks. Check between the valve seats and in the exhaust ports.
    14. NOTE:

    Do not attempt to weld the cylinder head, replace it.

  14. Inspect the cylinder head deck for corrosion, sand inclusions and blow holes.
  15. Inspect all the threaded holes for damage. Threads may be reconditioned with thread inserts.
  16. Inspect the sealing surfaces.
  17. Inspect the cylinder head plugs and verify the oil orifice is clear and free of debris.
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