TM 5-3805-281-24-2
Cylinder Head and Valves
MEASURE CYLINDER HEAD THICKNESS
Measure head thickness (A) from valve cover gasket
rail-to-combustion face.
Cylinder Head--Specification
Thickness................................................................... 155.45--155.71 mm
(6.120--6.130 in.)
Wear Limit ................................................................ 154.69 mm (6.09 in.)
Combustion Face Surface........................ 1.5--2.8 micrometers (60--110
Finish (Surface Mill Only to AA
micro-in.)
Finish)
Cylinder Head Thickness
Wave Depth............................................ 0.012 mm (0.0005 in.) maximum
If cylinder head thickness is less than wear limit, DO NOT
attempt to resurface. Install a new cylinder head.
IMPORTANT: After resurfacing, check flatness as
described earlier and check surface
finish on combustion face of head.
Check valve recess after grinding. (See
MEASUREMENT VALVE RECESS,
earlier in this group.) Valve face may be
ground to bring this characteristic
within specification.
NOTE: If necessary to resurface cylinder head, a
MAXIMUM of 0.762 mm (0.030 in.) can be ground
from new part dimension. Remove ONLY what is
necessary to restore flatness.
RG,RG34710,1087
1923OCT971/1