Cylinder Head

CLEANING
Clean all surfaces of cylinder block and cylinder heads.
Clean cylinder block front and rear gasket surface using a suitable solvent.

INSPECTION
Inspect all surfaces with a straightedge if there i, any reason to suspect leakage. If out-of-flatness, exceeds 0.00075 mm (0.0001 in.) times the span length in any direction, either replace head or lightly machine the head surface.

FOR EXAMPLE: -A 305 mm (12 in.) span is 0.102 mm (0.004 in.) out-of-flat. The allowable out-of-flat is 305 x 0.00075 (12 x 0.00075) equals 0.23 mm (0.009 in.). This amount of out-of-flat is acceptable.
The cylinder head surface finish should be 1.78 - 3.00 microns (70 - 125 microinches).
Inspect push rods. Replace worn or bent rods.