TM-9-2815-220-24 Maintenance Manual for AVDS-1790-2CA AVDS-1790-DA and AVDS-1790-2DR Engines Download
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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