CRANKSHAFT BEARING YAMAHA 93310-835U8

Function and technical context

The crankshaft bearing is a critical component of the lubrication system that allows the crankshaft to rotate within the engine block with minimal friction. This precision part supports the alternating loads generated by combustion and transmits the engine's power to the propeller, maintaining a constant oil film between its surfaces. Its progressive wear reduces lubrication pressure, increases internal friction and can cause engine seizure, loss of power and even complete stoppage of the machine while sailing.

When to replace this part?

Symptoms of crankshaft bearing wear include metallic noises or knocking inside the engine, irregular drop in revolutions, abnormal hull vibration and visible increase in oil consumption. Although there is no universal fixed interval, it is recommended to check the condition of the bearings during each seasonal maintenance and replace them preventively if play is detected or if the engine has exceeded 1500-2000 hours of intense operation. Preventive replacement avoids costly emergency repairs at sea and ensures propulsion system reliability.

Equivalent manufacturer part numbers