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This is a Lower Crankshaft, typically bought along with an Upper Crankshaft (NSN: 2815-011818463). The lower crankshaft and upper crankshaft work in unison in order to expel exhaust gases. The cranksh... This is a Lower Crankshaft, typically bought along with an Upper Crankshaft (NSN: 2815-011818463). The lower crankshaft and upper crankshaft work in unison in order to expel exhaust gases. The crankshafts are one of the largest and most important moving parts of a diesel engine. The crankshafts are essential in controlling the propulsion of the submarine.