PUMP COVER 688-44323-00 REC688-44323-00

Function and technical context

The 688-44323-00 pump cover is a closure and sealing component that integrates the cooling and water circulation system in Yamaha outboard engines. This piece acts as an access and sealing element in the water pump, allowing the controlled flow of coolant to the engine cooling system. Failure or wear of this cover compromises the tightness of the cooling circuit, causing water loss, sediment or air entry into the pump, which reduces cooling efficiency and increases the risk of overheating of the engine block.

When to replace this part?

The pump cover should be inspected regularly at each seasonal maintenance, especially if there are water leaks around the pump housing, rust deposits or mineral residue around the assembly, or if the engine shows symptoms of overheating without apparent cause in the thermostat or main circuit. It is recommended to preventively replace this part if it presents cracks, deformations in the closing seat or when deep maintenance is carried out on the cooling pump. Replacing the cap preventively avoids costly repairs resulting from secondary failures in the cooling system during the boating season.

Equivalent manufacturer part numbers