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 TM 55-1905-219-14-8
4-7.10A. ENGINE - MAINTENANCE INSTRUCTIONS (Continued).
ENGINE RECONDITIONING (Cont)
Observe no smoking regulations, Avoid prolonged contact with,
or inhalation of cleaning solvent. Avoid use near heat or open
flame and provide adequate ventilation.
(5) Cleaning.
After checking shaft, thoroughly clean assembly with general purpose cleaner. DO NOT use kerosene
as this leaves an oily film. Alcohol or lacquer thinner also must not be used as these, on the other hand, leave
parts too dry and may cause seizure during initial start up after reconditioning.
b. Crankcase.
Carefully inspect upper and lower halves of crankcase assembly. Check mating surfaces. Replacement of the
crankcase assembly may be required if surfaces are badly nicked or grooved.
Make sure that all screws,
threads, studs, etc., are clean and undamaged. Remove varnish, gum, etc., deposits from internal and external
surfaces by using carbon removing compound, MIL-C-19853, NSN 6850-00-702-8451.
c.
Cylinder head.
Make certain that cooling fins are unbroken and that threads for spark plug are clean and undamaged.
Also check gasket surface of head. Replace head if internal surface is scratched, nicked or distorted.
Clean out any carbon deposits from inside the combustion dome by using carbon removing compound MIL-C-
19853, (NSN 6850-00-702-8451) if badly varnished or if carbon deposits cannot be removed, use a new
cylinder head.
d. Cylinders
NOTE
Carefully observe cylinder bore for signs of scuffing, check
gasket surfaces for nicks or grooves which could prevent
proper sealing, check for badly chipped or broken fins. Also
make sure threads are not stripped. Use a new cylinder head if
damage is noted.
4-392
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