YAMAHA NUT 90179-08M06 REC90179-08M06

Function and technical context

This nut is part of the engine's structural fixing systems, ensuring the union of critical components in power transmission and the mechanical stability of the engine block. Its correct tightening is essential to maintain the integrity of the internal assemblies and avoid vibrations that would compromise the performance of the propeller. A deteriorated or poorly threaded nut can cause progressive loosening of components, leading to loss of power, abnormal noises in the engine and, in extreme cases, major damage to the lubrication and cooling systems.

When to replace this part?

It should be replaced when advanced corrosion, thread deformation, or loss of tightening capacity is detected after multiple disassembly cycles. It is recommended to check the condition of all lock nuts during seasonal maintenance, especially on boats operating in salt water where corrosion accelerates wear. Preventive replacement avoids costly emergency repairs in navigation and ensures the structural safety of the propeller.

Equivalent manufacturer part numbers