Cylinder Head Inspection

Cylinder Head Inspection

Valve and Cylinder Head Disassembly and Reassembly

Combustion Chamber

- Remove all carbon deposits from each combustion chamber.

NOTE:
Do not use any sharp-edged tools 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.

- Check cylinder head for cracks on intake and exhaust ports, combustion chambers, and head surface.

Cylinder Head Flatness

Use a straightedge (1) and feeler gauge (2) to check flatness of gasket surface at a total of 6 locations.

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 and over surface plate and rubbing gasket surface against paper to grind off high spots.

Replace cylinder head if it is impossible to correct cylinder head distortion.

NOTE:

Distorted mating surface of cylinder head and cylinder head gasket causes combustion gas and/or coolant to leak, which may result in overheating and reduced power output.

Distortion of mating surface of cylinder head and cylinder head gasket
Limit: 0.03 mm (0.0011 in.)









Manifold Seating Surface Flatness

Use straightedge (1) and feeler gauge (2) to check flatness of manifold seating surface.

Correct seating surface or replace cylinder head if measured value exceeds its limit.

Distortion of seating face of intake manifold and exhaust manifold on cylinder head
Limit: 0.05 mm (0.0019 in.)