Clean Combustion Chambers; Clean Valve Guide Bushings; Clean Cylinder Head; Inspect Cylinder Head For Flatness - Toyota 22R-E Service Manual

EG1–22
ENGINE – ENGINE MECHANICAL

3. CLEAN COMBUSTION CHAMBERS

Using a wire brush, remove all the carbon from the
combustion chambers.
NOTICE: Be careful not to scratch the head gasket con–
tact surface.

4. CLEAN VALVE GUIDE BUSHINGS

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

5. CLEAN CYLINDER HEAD

Using a soft brush and solvent, clean the head.
NOTICE: Do not clean the head in a hot tank as this will
seriously damage it.

6. INSPECT CYLINDER HEAD FOR FLATNESS

Using a precision straight edge and thickness gauge,
measure the surface contacting the cylinder block and
manifold for warpage.
Maximum head surface warpage:
0.15 mm (0.0059 in.)
Maximum manifold surface warpage:
0.20 mm (0.0079 in.)
If warpage is greater than maximum, replace the cyl–
inder head.