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 TM 55-1905-219-14-8
4-7.10A. ENGINE - MAINTENANCE INSTRUCTIONS (Continued).
(2) As the piston moves upward in the cylinder it draws the fuel/air mixture into the crankcase through
the intake manifold while at the same time compressing fuel that has been forced into the combustion
chamber.
(3) As the piston nears top dead center the spark plug is fired and the compressed fuel/air mixture
burns and expands, thereby forcing the piston downward on a power stroke.
(4) As the downward stroke of the piston turns the crankshaft, it also starts to compress the fuel/air
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