Yanmar 129170-21001 Crankshaft Assembly

The Yanmar 129170-21001 crankshaft assembly is a genuine OEM component designed for Yanmar 3JH2 series marine diesel engines. This assembly includes the crankshaft main journals, connecting rod journals, counterweights, and associated bearing surfaces manufactured to OEM specifications. Engineered for marine propulsion applications, the crankshaft converts reciprocating piston motion into rotational torque for propeller drive. The component undergoes precision machining and heat treatment processes to withstand cyclic combustion loads and marine operating conditions including variable RPM ranges and saltwater exposure environments. Direct OEM replacement for Yanmar part number 129170-21001. Compatible with multiple 3JH2 series engine variants used in marine propulsion and auxiliary power applications.