NUT 6G5-45384-00 REC6G5-45384-00

Function and technical context

This nut is one of the critical fastening elements in Yamaha engines, ensuring the stable union of structural and functional components of the engine block. Its mission is to ensure that the various subassemblies remain firmly coupled during operation, avoiding vibrations that could loosen other parts or cause misalignment. A poor screw connection or a worn nut compromises the mechanical integrity of the engine, and can cause water infiltration, loss of tightness in joints and, in severe cases, failures in distribution chains or cooling systems.

When to replace this part?

The engine mounting nuts must be inspected regularly during each maintenance or disassembly operation, as they may show deformation in the threads, oxidation or loss of pretension after heating and cooling cycles. If you notice abnormal vibration in the engine, metallic noises during operation or water leaks in areas where there are bolted connections, it is advisable to check the condition and tightness of all the block nuts. Preventatively replacing damaged or worn nuts during seasonal inspection prevents on-water emergency repairs and prolongs the life of attached systems.

Equivalent manufacturer part numbers