LO 8-8 Identify causes of bending and torsional stress of crankshafts and describe the methods used to minimize crankshaft mechanical stress

1. Fundamentals of Crankshafts

Fundamentals of Crankshafts

Crankshafts convert the up-and-down or reciprocating movement of pistons to rotational movement. Engine power is transmitted through the crankshaft to the flywheel, where the powertrain connects to the engine. The higher cylinder pressures and rapid combustion phase of a diesel engine require unique and sophisticated crankshaft design, construction, and service procedures. The rugged sophistication of the crankshaft is reflected in manufacturing costs, which makes the component one of the most expensive production costs of an engine after the fuel system and turbocharger. Understanding the construction details of crankshafts will help a technician realize the importance of the skills related to the handling and servicing of a crankshaft and crankshaft bearings to ensure optimal engine reliability and longevity.