YAMHA BEARING 93306-305U3 REC93306-305U3

Function and technical context

This bearing is part of the transmission and mechanical support system of Yamaha engines, allowing the smooth and controlled rotation of critical axles within the powertrain. Its mission is to reduce friction between moving surfaces by housing steel balls or rollers, ensuring that rotation forces are distributed evenly. A worn or damaged bearing compromises the alignment of the camshaft or crankshaft, causing abnormal vibration, loss of engine power and, in advanced cases, mechanical seizure that can render the propulsion equipment unusable.

When to replace this part?

Typical symptoms of an end-of-life bearing include rubbing or grinding noises during operation, unusual engine vibrations, and progressive loss of revolutions under load. Although there is no universal replacement interval for this type of component, it is recommended to inspect it during each seasonal inspection and replace it preventively if it presents looseness, roughness when turned manually or shows signs of corrosion. An early replacement avoids unplanned navigation stops and costly engine repairs resulting from sudden failure.

Equivalent manufacturer part numbers