CRANKSHAFT BEARING YAMAHA 93306-305U8

Function and technical context

This crankshaft bearing is a critical component of the Yamaha engine lubrication and support system. It acts as a radial support element that allows the fluid rotation of the crankshaft, transmitting combustion forces to the transmission and reducing friction between moving metal surfaces. Its deterioration generates abnormal vibrations, increased fuel consumption and, in advanced states, complete seizure of the crankshaft with the risk of engine stoppage while sailing.

When to replace this part?

Symptoms of wear include abnormal metallic noise coming from the crankcase, noticeable vibrations at idle that increase with revolutions, and progressive loss of power with dirty oil or visible metal particles. It is recommended to inspect the condition of the bearing during each seasonal maintenance and replace it preventively if axial play, looseness or discoloration due to excessive friction is detected. An early change prevents catastrophic crankshaft failure and complete engine repairs at sea.

Equivalent manufacturer part numbers