WASHER 90206-22M19

Function and technical context

The 90206-22M19 washer is a critical fastening component on Yamaha, Mercury and Parsun outboard motors, where it acts as a load distribution element under the heads of heavy-duty screws and bolts. This piece works in the structural fixing system of the engine, ensuring that the clamping forces are transmitted uniformly and avoiding local collapse in softer materials or aluminum. Wear or corrosion on this washer can cause progressive loosening of critical joints, entry of salt water into sensitive areas, or vibrations that compromise the integrity of adjacent components.

When to replace this part?

Check the condition of the washers during each seasonal maintenance, especially if the engine has been exposed to a marine environment or salt water, as corrosion and oxidation weaken their holding capacity. If you notice recurrent loosening bolts, warped washers, or corrosion deposits around critical joints, replace the set of affected washers immediately. Preventive replacement during general inspection work avoids costly repairs due to water ingress or structural failures at sea.

Equivalent manufacturer part numbers