YAMAHA WATER PUMP KIT 6CE-W0078-01

Function and technical context

The water pump is the vital component of the cooling system in high performance Yamaha marine engines. Its function is to drive the flow of seawater through the engine passages, extracting the heat generated by combustion and keeping it within safe operating ranges. This piece works continuously throughout navigation, circulating cold water from the outside to the combustion chambers, cylinder heads and engine blocks. Without a water pump in perfect condition, the engine suffers progressive overheating that deteriorates seals, degrades the lubricating oil and can cause crankshaft seizure or deformation of critical internal components.

When to replace this part?

The most common symptoms of a worn water pump kit include visible water leaks around the pump area, progressive loss of cooling flow and, in advanced cases, engine overheating indicated by thermal alarms or a red thermometer needle. In engines used for intensive navigation or in water with sediment, it is recommended to inspect the condition of the impeller and seals each navigation season, and replace preventively every 5-7 years or after 800-1000 hours of operation, whichever is earlier. Performing this replacement preventively in workshop maintenance is significantly more economical than repairing the serious breakdowns that result from a catastrophic failure at sea.

Equivalent manufacturer part numbers