PROPELLER SHAFT 66T-45611-00

Function and technical context

The propeller shaft is the power transmitting component that connects the engine to the propeller, allowing the transformation of the rotary movement of the crankshaft into the thrust necessary to propel the boat. In Yamaha outboard motors, this shaft works within the transmission and propulsion system, being responsible for supporting the torsional loads and dynamic efforts derived from navigation. Its integrity is critical: a worn, bent or cracked shaft compromises the transmission of engine torque, generating abnormal vibrations, loss of traction and possible entry of water into the gearbox.

When to replace this part?

Typical symptoms of propeller shaft deterioration include pronounced vibrations during acceleration, metallic noises coming from the tail of the engine, visual misalignment of the propeller, or loss of thrust power with no change in engine revolutions. It is recommended to inspect the shaft annually, especially after sailing in weedy waters or after impacts with submerged objects. Preventive replacement before the start of the sailing season avoids unforeseen breakdowns at sea and costly repairs in the workshop.

Equivalent manufacturer part numbers