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TM 10-4320-324-14
(13) Inspect valves for cracks and pits. Replace as
required. Reface valves if required and inspect
to the tolerances specified in Appendix F,
Table F-1.
(14) Inspect cylinder head for external damage or
cracks. Replace cylinder head if damaged or
cracked.
(15) Check cylinder head seating surface. It must
be flat and square. Slight damage to seating
surface can be removed by grinding cylinder
head on cylinder with fine abrasive paste.
(16) If cylinder head seating surface is more
severely damaged, recut with plate mill.
(17) After reworking, measure clearance between
cylinder head bottom and cylinder head seating
surface. The measured value may not be
lower than 0.23 in. (5.8 mm).
(18) Insert valve seat and measure distance from
crown of valve to cylinder head seating
surface. If distance exceeds specifications on
either valve (Table 6-1), seat must be
replaced.
(19) Check clearance of valve stems in guides of
both valves. If it exceeds 0.0016 in. (0.04
mm) inlet valve, or 0.0024 in. (0.06 mm)
exhaust valve, replace guides.
(20) Inspect cylinder liner as follows. If necessary,
replace complete with piston.
(a) Set dial gauge to 3.937 inches (100 mm).
(b) Measure cylinder bore at levels 1 to 4 of
engine center line "a" as well as crossline
"b".
(c) Compare readings with above dimensions.
If not within plus 0.0079 inch (0.2 mm),
replace parts concerned.
6-19
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