WATER PUMP KIT 692-W0078-00

Function and technical context

This water pump kit forms an essential component of the Yamaha marine engine cooling system, responsible for driving coolant fluid through the internal galleries of the engine to maintain optimal operating temperatures. The pump draws seawater through the water intake and distributes it under pressure to the engine block, ensuring that all combustion chambers and critical areas receive continuous cooling. Poor operation of this pump causes heat retention, engine overheating, progressive loss of power and, in extreme cases, crankshaft seizure or irreversible damage to the cylinder head and pistons.

When to replace this part?

Symptoms of wear in pump kits include decreased water flow in the discharge nozzle, visible leaks in the mechanical seals, presence of lime deposits or corrosion in the connections, and high and abnormal readings of the engine temperature gauge even when sailing at normal speed. It is recommended to check the water pump every 300-400 hours of operation and replace it preventively every 500-600 hours or as directed in the Yamaha service manual. Preventive replacement is significantly cheaper than having to repair the engine after serious overheating.

Compatible Yamaha engines

Equivalent manufacturer part numbers