YAMAHA BOLT 66T-11681-00 REC66T-11681-00

Function and technical context

This bolt is one of the critical fastening and structural elements in Yamaha engines, guaranteeing the mechanical integrity of vital components of the propulsion system. Its function is to permanently secure engine parts that withstand continuous vibrations and dynamic loads during navigation. A failure in the fixation of this bolt can compromise the stability of essential subsystems, causing misalignment, leaks or decoupling of adjacent components that lead to loss of power or breakdown at sea.

When to replace this part?

The retaining bolts can deteriorate due to marine corrosion, vibration fatigue or progressive loosening during prolonged engine use. It is recommended to check the condition and tightness of all fastening elements during each seasonal maintenance or after 100-150 hours of navigation, especially in saline environments where oxidation accelerates wear. Preventive replacement of this pin avoids costly emergency repairs and ensures the mechanical reliability of the propulsion system.

Equivalent manufacturer part numbers