Inspection After Removal

• Clean the cylinder head (1) with contact cleaner and a lint-free cloth. Be sure to remove all leftover gasket residue.

  Courtesy of NISSAN NORTH AMERICA, INC.

  WARNING: When using compressed air for cleaning, to avoid the risk of personal injury from flying debris and dirt:

  • Do not exceed 207 kPa (2.111 kg/cm ² , 30 psi).
  • Wear appropriate eye protection and protective clothing including gloves.
  CAUTION:

  • Do not use abrasive pads to clean the cylinder head. Only use pads that do not contain abrasive materials and thoroughly remove all debris after cleaning.
  • Do not use metal tools to clean the cylinder head. Metal tools can scratch the combustion face.
• Use a suitable tool to clean the valve guide bores, injector bores, and the glow plug bores.
• Clean the carbon from the injector seats with Tool and WD-40. Do not use solvent in place of WD-40.
  CAUTION: Do not use any solvents to clean the injector seats.

  Tool	:-- - (J-54428)

• Clean the carbon deposits from the valve seats.
• Clean the intake and exhaust ports and other surfaces and bores with a brass brush and WD-40.
• Clean the springs, valves, and valve guides.

Cylinder Head 

• Wash the cylinder head in a hot, soapy water solution.
• Rinse the cylinder head with clean water.
• Dry the cylinder head with compressed air. Be sure to blow out the valve guides and seats.
• Spray the valve guide seats with WD-40 to prevent rust.

• Inspect the cylinder head combustion decks for damage.
• If cracks are found, replace the cylinder head.
• Inspect the area within 3.175 mm (0.125 in) of the firing ring diameter and sealing locations.
  NOTE: Place the old cylinder head gasket onto the cylinder head to identify the sealing path for the gasket.
• Any wear that can be felt with a fingernail within the 3.175 mm (0.125 in) area is unacceptable and the cylinder head must be replaced.
• Wear beyond this 3.175 mm (0.125 in) area will have no effect on future combustion sealing and the usability of the cylinder head.

• Inspect the valve seat inserts for cracks or burnt spots.
• If the valve seat inserts are damaged, replace the cylinder head.
• Inspect the valves for damage. Inspect the valve collet grooves for wear.
• Inspect the valve guides for scuffing or scoring.
• Inspect the valve springs for damage or excessive wear. If a damaged spring is found, replace the spring.

• Inspect the valve retainers and valve collets for damage or worn areas.
• Inspect the camshaft bores and camshaft caps for signs of wear, nicks, or gouges. If the camshaft bore has corresponding damage on the camshaft, the cylinder head and camshaft must be replaced.
• Inspect the camshafts. If damage is found, replace the component as necessary.
• Inspect the cylinder block. If damage is found, replace the component as necessary.