YAMAHA PROPELLER SPACER 688-45997-00

Function and technical context

The propeller spacer is a critical component in the marine drive system that interposes between the propeller and the engine coupling hub. Its function is to maintain the correct distance between the propeller and the engine body, guaranteeing the axial alignment of the propeller and avoiding misalignments that could cause excessive vibrations, friction with the engine structure or damage to the internal bearings. Once properly installed, it ensures that the propeller operates at the performance conditions for which it was designed, without transferring abnormal loads to the drive shaft or compromising the integrity of the engine.

When to replace this part?

The spacer should be checked if you notice abnormal vibrations in the propeller, friction noises in the coupling area or if it has been removed or displaced after repairs to the transmission system. Although it does not have a fixed maintenance interval like filters or impellers, it is advisable to inspect its condition during each seasonal maintenance, especially after navigation in shallow waters or after impacts with submerged objects that could have changed its position. Replacing it preventively when deformations, cracks or wear are observed ensures proper transmission alignment and avoids costly axle or motor repairs.

Equivalent manufacturer part numbers