Toyota Supra 1990 Manual page 74

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ENGINE MECHANICAL - Cylinder Head

CLEAN COMBUSTION CHAMBER

Using a wire brush, remove all the carbon from the com-

bustion chambers.

Be careful not to scratch the head gasket con-

tact surface.

CLEAN VALVE GUIDE BUSHINGS

Using a valve guide brush and solvent, clean all the valve

guide bushings.

CLEAN CYLINDER HEAD

Using a soft brush and solvent, thoroughly clean the head.

INSPECT CYLINDER HEAD FOR FLATNESS

Using a precision straight edge and thickness gauge, meas-

ure the surface contacting the cylinder block and manifold

for warpage.

Maximum warpage:

0.10 mm (0.0039 in.)

If warpage is greater than maximum, replace the cylinder

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