YAMAHA PROPELLER NUT 90171-10M01

Function and technical context

The propeller nut is the critical fastener that secures the propeller to the drive shaft of the Yamaha engine. This piece works in the transmission system, supporting the rotational and traction forces generated during the propulsion of the boat. Correct tightening is essential to prevent the propeller from loosening during navigation, which would cause excessive vibration, loss of thrust and potential damage to the propeller shaft. Failure or weakening of this nut can lead to accidental disconnection of the propeller, completely compromising the maneuverability of the boat.

When to replace this part?

Although the propeller nut is a robust component, it should be inspected regularly at each seasonal maintenance for signs of corrosion, warping or loss of fit. Symptoms of failure include abnormal vibrations while driving, metallic noises coming from the propulsion area or visible movement of the propeller relative to the shaft. It is recommended to replace it preventively if it presents advanced corrosion or if it has been subjected to impacts (groundings, hits against submerged objects), since a compromised fixation can result in costly repairs and emergency situations in the water. Using Yamaha's exact specification ensures correct tightening torque and boating safety.

Equivalent manufacturer part numbers