YAMAHA WASHER 92990-18200 REC92990-18200

Function and technical context

The 92990-18200 washer is a critical fastening component on Yamaha, Mercury and Mariner outboard motors, responsible for evenly distributing the load on fastening points of the sealing system and engine assembly. It works in conjunction with screws and nuts in areas of high vibration and salt exposure, preventing the loosening of structural joints and the entry of water into internal cavities. Its deterioration or corrosion generates pressure loss in critical seals, which can compromise the tightness of the engine and facilitate the penetration of seawater into lubrication and cooling circuits.

When to replace this part?

Washers show signs of wear when visible corrosion, material deformation is observed, or when the screws to which they secure show recurring loosening after engine operation. It is recommended to check the condition of these parts during each seasonal maintenance, especially in boats operated in salt water where corrosion accelerates their degradation. Replacing them preventively during major maintenance tasks avoids costly sealing problems and emergency repairs in navigation.

Equivalent manufacturer part numbers