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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 198 (Engine Mechanical - 3.6L (LF4) - Repair Instructions (3 Of 4)) >> Repair Instructions >> Cylinder Head Overhaul >> Cleaning and Inspection Procedure - Required

Cleaning and Inspection Procedure - Required

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  1. Ensure proper use of room temperature vulcanizing (RTV) sealant. Use of Room Temperature Vulcanizing (RTV) and Anaerobic Sealant
  2. Remove any old thread sealant, gasket material or sealant using EN - 28410  Gasket Remover.
  3. Clean all cylinder head surfaces with non-corrosive solvent.
    4. WARNING:

    Refer to Safety Glasses Warning .

  4. Blow out all the oil galleries using compressed air.
  5. Remove any carbon deposits from the combustion chambers using the GE - 8358  Carbon Removal Brush.
  6. Clean any debris or build-up from the lifter pockets.
  7. GM1210905

    Inspect the cylinder head camshaft bearing surfaces for the following conditions:

    • Excessive scoring or pitting
    • Discoloration from overheating
    • Deformation from excessive wear
    • If the camshaft bearing journals appear to be scored or damaged, you must replace the cylinder head. DO NOT machine the camshaft bearing journals.
  8. If any of the above conditions exist on the camshaft bearing surfaces, replace the cylinder head.
  9. Inspect the cylinder head for the following:
    • Cracks, damage or pitting in the combustion chambers
    • 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 - Deck Flatness Inspection.
    • Burrs or any defects that would degrade the sealing of the NEW secondary camshaft drive chain tensioner gasket
    • 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 passages
    • Restrictions in the intake or exhaust passages
    • Restrictions in the cooling system passages
    • Rusted, damaged or leaking core plugs
  10. If the cylinder head is cracked or damaged, it must be replaced. No welding or patching of the cylinder head is recommended.
  11. GM1992487

    Inspect the fuel rail injector bores and clean with EN - 47909  Injector Bore and Sleeve Cleaning Kit, if required.

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