VERTICAL SHAFT 66T-45501-11

Function and technical context

The vertical shaft is a fundamental structural component in the power transmission of Yamaha outboard engines, connecting the engine block to the tail unit and allowing the transfer of rotary motion to the propeller. This shaft works within the transmission system, supporting continuous mechanical stress and vibrations typical of operation at different revolutions. Its correct condition is essential to maintain the alignment of the propulsion assembly, avoid excessive vibrations that compromise the structure of the boat and guarantee efficient transmission of engine power to the propulsion.

When to replace this part?

A worn or damaged vertical shaft can manifest itself through abnormal vibrations during navigation, metallic noises coming from the transmission area or a noticeable loss of alignment that affects the handling and behavior of the boat. It is recommended that the shaft and its attachment points be inspected at each seasonal maintenance, especially after sailing in shallow water or floating debris that may have impacted it. Preventive replacement of this part prevents secondary damage to the gearbox, bearings and bearings, which would result in significantly more expensive repairs.

Equivalent manufacturer part numbers