Yanmar 129659-42040 Water Pump Assembly

The Yanmar 129659-42040 water pump assembly is a precision-engineered cooling system component designed for the Yanmar 4TNV88 four-cylinder diesel engine. This centrifugal pump assembly maintains optimal engine operating temperature by circulating coolant through the engine block, cylinder head, and radiator. The unit includes the pump housing, impeller, shaft, bearing, seal, and mounting gasket for direct installation. Constructed from cast iron housing with a stainless steel impeller and ceramic-carbon mechanical seal, the assembly withstands continuous operation at engine speeds up to 3000 RPM. The gear-driven design ensures positive coolant flow proportional to engine speed. This assembly serves as a direct OEM replacement for Yanmar compact tractors including the EF453 and EF453T models, as well as other equipment powered by the 4TNV88 engine platform.