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Home >> Cadillac >> 2006 >> STS Base, 3.6 7, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Engine Mechanical - 4.6L (LH2) - 3 Of 5) >> Off-Vehicle Repair Instructions (Part 2) >> Cylinder Head Cleaning and Inspection - Off Vehicle >> Visual Inspection Procedure

Visual Inspection Procedure

WARNING: This page is about a different variant/trim than selected.
  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.
    3. Fig 1: Locating Left Pressed-In Restrictor
    GM1254496Courtesy of GENERAL MOTORS CORP.
  3. The oil passage from the left cylinder head deck face that feeds the stationary hydraulic lifters (SHLAs) and the camshafts has a pressed-in restrictor. The orifice within the restrictor is 3 mm (0.1181 in). DO NOT remove the restrictor. Ensure the restrictor and oil passage are clean and free of any debris.
    4. Fig 2: Insuring Proper Cylinder Head Oil Gallery Restrictor Installation Depth
    GM1254499Courtesy of GENERAL MOTORS CORP.
  4. Ensure the left cylinder head oil gallery restrictor is installed to the proper depth of 1.5-5.5 mm (0.059-0.216 in).
    5. Fig 3: Locating Right Pressed-In Restrictor
    GM1254498Courtesy of GENERAL MOTORS CORP.
  5. The oil passage from the right cylinder head deck face that feeds the stationary hydraulic lifters (SHLAs) and the camshafts has a pressed-in restrictor. The orifice within the restrictor is 3 mm (0.1181 in). DO NOT remove the restrictor. Ensure the restrictor and oil passage are clean and free of any debris.
    6. Fig 4: Insuring Proper Cylinder Head Oil Gallery Restrictor Installation Depth
    GM1254499Courtesy of GENERAL MOTORS CORP.
  6. Ensure the right cylinder head oil gallery restrictor is installed to the proper depth of 1.5-5.5 mm (0.059-0.216 in).
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