WATER PUMP SEAL BODY 688-44341-01-94 REC688-44341-01

Function and technical context

The water pump seal body is the structural component that houses the sealing systems in Yamaha engines. This piece forms an integral part of the engine cooling circuit, hermetically sealing the water pump to prevent coolant leaks and the entry of seawater into areas where it should not circulate. Its correct function is essential to maintain the pressure of the cooling system and avoid contamination of the circuit. The deterioration of the seals causes progressive losses of coolant, which leads to overheating of the engine and, in serious cases, cavitation of the pump and irreversible damage to cylinders and gaskets.

When to replace this part?

The most common symptoms include moisture stains around the pump shaft, reduced coolant level without visible leaks in hoses, and presence of fresh or salt water in the engine crankcase. It is recommended to inspect the condition of the seal body during each seasonal inspection, especially if the engine has been operated in very cold water or with sediment; Preventive replacement avoids unexpected navigation stops and costly repairs that affect other components of the cooling system.

Equivalent manufacturer part numbers