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 TM 55-1905-220-14-8
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 I
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 scuf-
fing, 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 dam-
age is noted.
4-394
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