NUT 664-45384-00 REC664-45384-00

Function and technical context

This nut is part of the structural fastening and fastening systems of outboard motors, guaranteeing the mechanical integrity of critical components in the engine block and attached accessories. Correct tightening is essential to maintain the tightness of the joints, especially in areas exposed to contact with salt water and continuous vibrations during operation. Inadequate tightening or a worn nut can compromise the working pressure in cooling and lubrication systems, leading to losses of vital fluids and accelerated deterioration of adjacent parts.

When to replace this part?

Locking nuts should be inspected regularly during each seasonal maintenance, especially after operations in high saline waters where corrosion accelerates deterioration. If you detect abnormal vibrations in the engine block, coolant or oil leaks at connection points, or if the nut shows advanced surface corrosion or thread loss, replacement is immediate. Performing a preventive check and changing worn nuts before the intensive sailing season avoids costly repairs at sea and ensures the reliability of the propulsion system.

Equivalent manufacturer part numbers