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 TM 9-2815-220-24
THEORY OF OPERATION
0004 00
ENGINE COMPONENTS (Continued)
Crankshaft, Flywheel, and Damper:
The crankshaft is the main shaft of the engine
which, when turned by connecting rods,
changes the reciprocating motion of the
pistons to rotary motion of the power train.
The crankshaft assembly is a nitrided steel
forging with seven main bearing journals and
six crankpins (connecting rod journals).
Each crankpin accommodates two opposing
connecting rod assemblies. Flanges are
provided on the crankshaft for mounting the
flywheel on the rear and a torsional vibration
damper on the front end.
The flywheel is attached to one end of the crankshaft and
provides inertia so the crankshaft will complete the rotation
resulting from each compression-induced firing to the next.
It helps smooth the operation of the engine.
The torsional vibration damper is attached to
the opposite end of the crankshaft. It is a
precision viscous type and is replaceable
only as an assembly. It augments the
function of the flywheel.
WP 0004 00-15
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