WASHER 90201-31M00 REC90201-31M00

Function and technical context

The 90201-31M00 washer is a fastening and sealing component that works in the fastening systems of critical elements in Yamaha and Mercury marine engines. This piece acts as a load distributor and prevents the entry of salt water into the assembly areas, protecting threads and contact surfaces. Its correct operation is essential to maintain the structural integrity of the engine and avoid infiltrations that compromise reliability in navigation.

When to replace this part?

Washers require inspection during every seasonal maintenance, especially on engines operating in salt water, where corrosion and seal degradation are more rapid. If you notice water leaks, visible rust around fixing points, or loosening of mounting screws, it is a sign that the washer has lost its waterproof function. Replacing it preventively at each comprehensive inspection avoids costly secondary damage to adjacent components.

Equivalent manufacturer part numbers