YAMAHA WATER PUMP KIT 6J8-W0078-A1

Function and technical context

The water pump is the heart of the cooling system in Yamaha outboard engines, responsible for propelling the cooling fluid through the cylinder block, cylinder head and radiator through the action of the crankshaft. In a marine environment, it maintains a constant circulation of seawater or fresh water to dissipate the intense heat generated during combustion and the mechanical work of the propellant. Wear or failure of this component causes progressive overheating, loss of engine power, accelerated degradation of gaskets and seals, and in critical situations, total seizure of the cylinder block with emergency stalling.

When to replace this part?

Symptoms of deterioration include abnormal readings on the instrument panel temperature gauge, water leaks around the pump housing, characteristic noises such as whistling or mechanical vibrations in the engine, and unexplained overheating of the sensors. It is recommended to inspect the condition of the impeller and seals at each oil change or seasonal maintenance service, especially if the engine has been operated in salt water; Carrying out the replacement preventively every 500 to 700 hours of navigation avoids costly repairs and emergency situations on the water.

Equivalent manufacturer part numbers