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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 77 (Engine Mechanical - 4.6L - 3 Of 4) >> Off-Vehicle Repair Instructions (2 Of 3) >> Cylinder Head Cleaning and Inspection >> Visual Inspection Procedure

Visual Inspection Procedure

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect the cylinder head for the following:
    • Cracks, damage or pitting in the combustion chambers.
      • IMPORTANT: DO NOT machine the camshaft bearing journals.
    • Scoring of the camshaft bearings and/or the journals. If the camshaft bearing journals appear to be scored or damaged, you must replace the cylinder head.
    • Debris in the oil galleries. Continue to clean the galleries until all debris is removed.
    • Coolant leaks or damage to the deck face sealing surface. If coolant leaks are present, measure the surface warpage as described under Cylinder Head Measurement.
    • Damage to any gasket surfaces
    • Damage to any threaded bolt holes
    • Burnt or eroded areas in the combustion chamber
    • Cracks in the exhaust ports and combustion chambers
    • External cracks in the water chamber
    • Restrictions in the intake or exhaust passages
    • Restrictions in the cooling system passages
    • Rusted, damaged, or leaking core plugs
  2. If the cylinder head is cracked or damaged, it must be replaced. No welding or patching of the cylinder head is recommended.
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