Cylinder Head Inspection
Precautions: General safety (00)
•Remove all carbon deposits from combustion chambers.
•Check cylinder head for crack on intake and exhaust ports, combustion chambers and head surface.
NOTE:
Do not use any sharp-edged tool to scrape off carbon deposits. Be careful not to scuff or nick metal surfaces when removing carbon deposits. The same applies to valves and valve seats, too.
Cylinder Head Flatness
Use a straightedge and feeler gauge to check flatness of gasket surface at a total of 6 positions.
If any measured value exceeds its limit, correct gasket surface with a surface plate and abrasive paper #400 (waterproof silicon carbide abrasive paper) by placing abrasive paper on surface plate and rubbing gasket surface against paper to grind high spots.
If it is impossible to correct cylinder head distortion, replace cylinder head.
NOTE:
Distorted mating surface of cylinder head and cylinder head gasket causes combustion gas and/or coolant leakage, overheating and reduced power output.
Distortion of mating surface of cylinder head and cylinder head gasket
Limit: 0.03 mm (0.0012 in.)
Distortion of seating faces intake manifold and exhaust manifold on cylinder head
Limit: 0.05 mm (0.0020 in.)
| [A]: | Intake side | [B]: | Exhaust side |