WATER PUMP KIT 6E5-W0078-01-00

Function and technical context

This water pump kit constitutes the heart of the cooling system in Yamaha outboard engines, extracting water from the external circuit and pushing it through the internal passages of the engine block to dissipate the heat generated during combustion. The assembly houses the centrifugal impeller and its associated components, operating in a high salinity and corrosion environment where the structural integrity of each element is critical to maintaining temperatures within safe margins. Without efficient water circulation, the engine experiences accelerated overheating leading to irreversible damage to the cylinder, gaskets and internal elements; Worn impeller cavitation dramatically reduces the cooling capacity of the system.

When to replace this part?

The water pump exhibits clear signs of aging when there is a visible reduction in the flow of water expelled from the discharge inlet, loss of cooling pressure indicated on the temperature gauges, or leaks around the drive shaft. It is recommended to check the condition of the impeller and seals every 300 to 400 hours of operation or, at least, before each intensive navigation season; In warm or high-sediment waters, it is prudent to expedite this inspection. Replacing the kit preventively avoids emergency strandings at sea and costly engine repairs due to thermal damage that exponentially multiply the cost of a specific intervention.

Engine Compatibility Table

Equivalent manufacturer part numbers