YAMAHA SEAL 93102-25008

Function and technical context

This seal is part of the Yamaha engine sealing system, sealing the area where the rotating shafts pass through the watertight casings of the engine block. Its function is to prevent the entry of water and the leakage of lubricant to the outside, maintaining the integrity of the cooling and lubrication circuit under navigation conditions. Failure or wear of the seal compromises the tightness of the engine, allowing salt water to enter critical areas that can cause internal corrosion, loss of power and catastrophic failure of the drive assembly.

When to replace this part?

A worn seal presents symptoms such as visible drips around the rotating shafts, presence of emulsion (water and oil mixture) in the crankcase, or gradual loss of power accompanied by abnormal vibrations. It is recommended to inspect the condition of the seal during each seasonal maintenance, especially on boats with intensive use or in salt water. Preventive replacement of the seal prevents emergency engine repairs and protects internal components of high economic value.

Equivalent manufacturer part numbers