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TM 10-3930-659-34
4-6.
CYLINDER HEAD ASSEMBLY REPAIR (Con’t).
3.
Using machinist’s steel rule and thickness gage,
check cylinder head (4) for flatness in several
places.
Out-of-flat
measurement
must
not
exceed 0.005 in. (0.127 mm) for entire length or
width of cylinder head, or 0.001 in. (0.025 mm)
for every 5.90 in. (14.99 cm) of length or width of
cylinder head. If any measurement exceeds
specification, replace cylinder head.
4.
Using outside caliper micrometer, measure
cylinder head (4) thickness. If thickness is less
than 4.104 in. (10.424 cm), replace cylinder
head.
5.
Using inside caliper micrometer, measure valve
guides
(9)
for
wear.
Maximum
allowable
clearance
is
0.006
in.
(0.152
mm).
If
measurement is not within specification, replace
cylinder head (4).
4-22
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