TM 5-3825-229-14&P
6-15. ENGINE CRANKCASE (BLOCK) (cont)
b.
Inspection.
Measuring Cylinder Bore
(1) Inspect crankcase for cracks, dents and damage. Replace crankcase if cracked or damaged.
(2) Measure the cylinder bore diameter with an inside micrometer at two places within bore. Measure at 0.63 in. (16
mm) from top of cylinder and at 5.16 in. (131 mm) from top. Check cylinder from out-of-round and taper of bore.
(3) The measurements should be as follows:
(a)
Bore inside diameter - 3.5034 to 3.5044 in. (88.987-89.013 mm). Maximum allowable wear limit is 3.5064
in. (89.063 mm).
(b)
Cylinder bore out-of-round - 0.002 in. (0.04 mm).
(c)
Bore taper - 0.003 in. (0.08 mm).
(d)
If cylinder bores are worn beyond the above specifications, replace crankcase.
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