WATER PUMP BODY 689-44311-01 REC689-44311-00

Function and technical context

The water pump body constitutes the central structural component of the cooling circuit in Yamaha marine engines. It houses the impeller and internal ducts that channel the flow of seawater through the engine block, allowing the evacuation of heat generated during combustion. Its integrity is essential to maintain the temperature within safe operating ranges; Any crack, blockage or cavitation erosion compromises coolant circulation and creates an immediate risk of overheating that can irreversibly damage cylinder heads, cylinder blocks and internal engine seals.

When to replace this part?

It should be checked when you notice water leaks in the pump area, abnormal loss of coolant without apparent cause, or if the engine shows symptoms of overheating even after inspecting the impeller and passages. Although there is no fixed replacement interval, annual seasonal inspections should include a visual assessment of the condition of the body; Microscopic cracks or internal cavitation erosion will progress rapidly on vessels operating in salt water. Replacing this part preventively before it causes a breakdown while sailing avoids costly emergency repairs and ensures the reliability of the cooling system on long voyages.

Equivalent manufacturer part numbers