PUMP BODY 688-44311-01 REC688-44311-01

Function and technical context

The 688-44311-01 pump body is the main structural component of the pumping system in Yamaha outboard engines, housing the internal rotors and seats that drive coolant flow through the engine cooling circuit. This piece works integrated into the water circulation system, being responsible for maintaining the pressure and flow necessary to evacuate the heat generated during combustion and mechanical friction. A failure in the pump body directly compromises the cooling capacity of the engine, resulting in overheating, possible melting of gaskets, accelerated corrosion of internal components and, in severe cases, impeller blockage or catastrophic failure.

When to replace this part?

The pump body requires inspection and replacement when refrigerant leaks around the casing, progressive loss of circulation pressure are detected, or when cavitation and abnormal noise are evident from the pump housing. Although there is no fixed routine replacement interval for this component, inspection every sailing season is recommended, especially in waters with high mineral or sediment content that accelerates internal wear. Replacing the pump body preventively when the first signs of wear are detected avoids repairs at sea and guarantees the reliability of the cooling system under extremely demanding conditions.

Engine Compatibility

Equivalent manufacturer part numbers