YAMAHA WATER PUMP KIT 6BG-W0078-00 REC6BG-W0078-00

Function and technical context

The water pump kit for Yamaha outboard engines constitutes the complete engine circulation and cooling assembly, responsible for extracting and distributing seawater through the cylinder block and cylinder head to dissipate the heat generated by combustion. This piece works within the salt water cooling circuit, being essential to maintain operating temperatures within safe ranges. A failure in the pump or its components causes immediate overheating, entry of water into the cylinders, accelerated internal corrosion and, in serious cases, complete seizure of the engine while sailing.

When to replace this part?

Symptoms of wear of the pump kit include loss of cooling water flow (detectable at the overflow outlet), abnormal noises from the pump area, progressive increase in engine temperature and presence of debris or bacteria in the circuit. It is recommended to check the condition of the impeller and seals at each seasonal maintenance, especially after prolonged operation in waters with high sediment content. Preventively replacing this assembly avoids forced stops in the middle of the sea and high-cost repairs resulting from overheating.

Equivalent manufacturer part numbers