YAMAHA BEARING 93315-317U2 REC93315-317U2

Function and technical context

This bearing is a critical component of the shaft lubrication and support system in outboard and marine engines. Its function is to reduce friction between the drive shaft and the engine structures, allowing smooth and efficient rotation of the propeller. It works under conditions of high pressure and constant exposure to salt water, supporting significant radial loads during navigation. The failure of this bearing generates accelerated wear of the shaft, loss of propeller alignment, water entry into critical areas of the engine and, in serious cases, total transmission failure.

When to replace this part?

Marine bearings show progressive wear evidenced by abnormal vibration of the propeller, metallic noises in the drive shaft, excessive lateral movement of the propeller or gradual loss of traction. It is recommended to inspect this component during each seasonal maintenance and replace it preventively every 2-3 years in boats with regular use, or after 500-800 hours of navigation depending on operating conditions. Preventative replacement before wear becomes severe avoids costly emergency repairs and maintains engine reliability throughout the entire sailing campaign.

Equivalent manufacturer part numbers