WATER PUMP BODY 61N-44311-00

Function and technical context

The 61N-44311-00 water pump body constitutes the central element of the forced circulation cooling system in Yamaha four-stroke engines. This component houses the impeller rotor and the internal passages that channel the cooling fluid through the engine block, continuously dissipating the heat generated in combustion. Its structural integrity is critical to maintaining the optimal operating temperature: any deterioration, internal corrosion or leak in the coupling areas causes a decrease in circulating flow, progressive overheating of the engine and acceleration of wear in cylinders, head gaskets and internal components sensitive to high temperatures.

When to replace this part?

Indicators of failure in the pump body include visible coolant leaks at the connection points, progressive loss of pressure detected by a pressure gauge, and engine overheating even during normal navigation. Although it does not have a fixed replacement interval in hours of operation, it is recommended to inspect this part annually at the beginning of each boating season, especially if the engine has been exposed to salt water or sediment that accelerates internal corrosion. Preventive replacement at the first signs of wear avoids emergency stops in navigation and prevents costly secondary damage to the engine block.

Equivalent manufacturer part numbers