Cylinder Head Inspection

Cylinder Head Inspection

Valve and Cylinder Head Disassembly and Reassembly

Combustion Chamber

- Remove all carbon deposits from all combustion chambers.

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.

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

Cylinder Head Flatness

Using a straightedge (1) and thickness gauge (2), check flatness of gasket surface at a total of 6 locations.

If any measure value exceeds its limit, correct gasket surface with a surface plate and abrasive paper of about #400 (Waterproof silicon carbide abrasive paper): place abrasive paper on and over surface plate, and rub gasket surface against paper to grind off 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 leakage, 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

Using straightedge (1) and thickness gauge (2), check flatness of manifold seating surface.

If measured value exceeds its limit, correct seating surface or replace cylinder head.

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