YAMAHA WATER PUMP KIT 6L2-W0078-00

Function and technical context

The water pump kit is the central component of the cooling system in Yamaha 4-stroke engines. This pump forces the circulation of seawater or fresh water through the internal galleries of the engine block, dissipating the heat generated by combustion and preventing overheating. The pump works synchronously with the engine cooling system, being essential to maintain operating temperatures within safe ranges. A failure in this component quickly leads to engine overheating, damage to gaskets, cylinders and internal components, and stoppage of the boat in the best of cases.

When to replace this part?

The water pump suffers from cavitation wear, marine corrosion and constant friction, especially on saltwater vessels. The main symptoms include loss of cooling capacity, water leaks around the pump shaft, abnormal noise in the cooling system or progressive increase in engine temperature even in normal navigation. It is recommended to check the condition of the pump during each seasonal maintenance and replace the kit preventively every 5-7 years or after 500-1000 hours of navigation, depending on use and type of water. Performing this replacement preventively is much cheaper than repairing an engine damaged by overheating.

Equivalent manufacturer part numbers