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 TM 55-1905-219-14-8
4-7.10A. ENGINE - MAINTENANCE INSTRUCTIONS (Continued).
GENERAL MAINTENANCE (Cont)
a. Carbon Removal.
(1) If excessive carbon is noted on the spark plug, check the condition of the combustion chamber and
top of the piston as these, too, may be carbon fouled.
(2) Remove the cylinder heads and remove the carbon deposits with a wood or plastic scraper to avoid
cutting or scratching the aluminum heads and pistons.
(3) If carbon build-up is heavy on top of the piston, the rings are often stuck or about ready to stick in
the grooves.
(4) Use carbon removing compound, MIL-C-19853, (NSN 6850-00-702-8451) to clean carbon build-up
on rings and other engine components.
(5) Clean off the carbon removing compound before reinstalling cylinder heads.
(6) Apply lubricant to cylinder wall, then use the ring compressor (for 2-cylinder engines) and install the
cylinder heads over piston.
(7) Tighten nuts and cylinder heads to 16 lbft (21.7 Nm) torque. Always use a new cylinder head
gasket.
b. Cooling System.
Engines are cooled by a belt driven blower. Never operate your engine with missing or loose air shroud
covers. Keep air intake openings on pump and engine clean and unobstructed at all times to prevent
overheating. Proper belt tension must be maintained for proper cooling. Fan belt deflection is 5/32 inch.
Adjust by tightening the four screws on the priming pump mounting bracket and the two screws on the priming
pump stabilizer bracket
4-387
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