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 TM 55-1905-219-14-4
3-25. CRANKSHAFT PULLEY AND VIBRATION DAMPER - MAINTENANCE INSTRUCTIONS.
a. The engine is equipped with either rigid or rubber mounted type pulleys. Rubber mounted pulleys have
a rubber insulator between the pulley and the pulley hub for vibration dampening.
b. The crankshaft pulley is keyed to the crankshaft and secured with a special washer and bolt.
c. A viscous type vibration damper is mounted on the front end of the crankshaft to reduce crankshaft
stresses to a safe value. The vibration damper is bolted to a hub which is on the front end of the crankshaft.
d. A viscous type vibration damper consists of an inertia mass (flywheel) enclosed in a fluid-tight outer
case but separated by a thin wall of viscous liquid not responsive to temperature changes. Any movement of
the inertia mass, is resisted by the friction of the fluid, which tends to dampen excessive torsional vibrations in
the crankshaft. The vibration damper must be removed whenever the crankshaft, crankshaft front oil seal, and
crankshaft front cover is removed.
3-643
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