Clean cylinder head assembly and related
components in hot soapy water solution. Allow
to air dry.
Polish valve stems using crocus cloth. Remark
valves for location in cylinder head.
Conduct general inspection of cylinder head
Inspect valve guides for scuffing or scoring.
Measure valve guide bore (dimension A). Bore
diameter shall not exceed 0.3157 in. (8.019
Inspect cylinder head surface for nicks, erosion,
or damage. Check for head distortion.
Variation within any 2 inch diameter area shall
not exceed 0.0004 in. (0.01 mm).
Inspect for abnormal wear on valve heads and
(dimension B). Diameter shall not exceed
0.3134 in. (7.960 mm).
Check valve seat angles for distortion. Intake
angle must be 30 degrees. Exhaust angle must
be 45 degrees.
Measure valve head rim thickness (dimension
C). Thickness shall nor exceed 0.031 in. (0.79