YAMAHA BOLT 663-11633-00 REC663-11633-00

Function and technical context

This bolt is one of the critical fastening elements in Yamaha engines, responsible for securing structural components of the engine block or transmission system. Its correct fixation is essential to maintain the mechanical integrity of the propeller and avoid unwanted movements that could cause excessive vibrations, misalignments or water entry into sensitive areas. A damaged or loose bolt compromises the sealing and alignment of the engine, which can lead to cascading failures of other adjacent components.

When to replace this part?

The bolts should be checked periodically during each seasonal maintenance, especially after hours of intensive navigation or in high vibration conditions. If you detect water leaks in the area where this element is housed, visible corrosion on the head of the bolt, or if the engine presents abnormal vibrations during operation, it is a sign that the bolt requires immediate replacement. Preventive replacement of this component during maintenance checks avoids costly repairs and ensures engine reliability in the next boating season.

Equivalent manufacturer part numbers