THICK t:1.4mm 61N-45587-00-14

Function and technical context

This shim disc is a critical component in the transmission system of Yamaha outboard motors, specifically F25 models. This is an axial play regulation piece that ensures the correct operation of the gearbox and propeller gears. Its thickness of 1.4 mm allows it to maintain the precise tolerances necessary to avoid vibrations, abnormal noises and premature wear of adjacent components. Incorrect alignment due to deterioration of this disc causes loss of power, increased fuel consumption and, in extreme cases, partial blocking of the transmission.

When to replace this part?

The supplementary discs require inspection when abnormal vibrations are detected in the stern area, sudden gear changes or increased play in the gear lever. Although they do not have a fixed replacement interval, it is advisable to inspect this component every two sailing seasons, especially if the boat has been used intensively or in salt water. Preventive replacement during general maintenance avoids costly offshore repairs and ensures operational safety of the propulsion system.

Equivalent manufacturer part numbers