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 SYSTEMS (Continued) 6. Mechanical System The mechanical system provides the entire drive train; it is the heart of the engine. Consisting of five major components, they are: Crankshaft assembly Connecting rod and piston assembly Cylinder and valves Camshafts Accessory drive subsystem ENGINE COMPONENTS The following engine components with a brief description of their functions are arranged in alphabetical order for ease of reference. Camshaft: The gear-driven shaft uses cam lobes (eccentrics) to operate the valves via the rocker arms. Left and right camshaft assemblies are mounted, one per engine bank, on the cylinders and operate the intake and exhaust valves. The camshafts are hollow to provide oil passages for pressure lubrication to the valve parts and to permit deflection when the cylinders fire. Tubular molded rubber hoses enclose the camshafts between cylinders. WP 0004 00-8