SPACER 66T-45997-00

Function and technical context

The 66T-45997-00 spacer is a positioning and fixing component that is part of the engine coupling and assembly systems. This piece guarantees correct alignment between critical mechanical elements, avoiding misalignments that could affect power transmission or internal lubrication. Its function is essential in Yamaha and Mercury engines to maintain exact dimensional tolerance between mating components, preventing abnormal vibrations and premature wear of seals and bearings.

When to replace this part?

The spacer should be inspected during each seasonal maintenance, especially if you detect unusual engine vibrations, oil leaks at the gaskets near the mating area, or if you have performed disassembly work in that area of the propeller. It is recommended to preventively replace the spacer when major coupling repairs are carried out or when visible deformation is seen on its surface. Changing this part preventively during scheduled inspections avoids future complications that could leave the boat immobilized.

Equivalent manufacturer part numbers