PROPELLER SHAFT

Function and technical context

The propeller shaft is the transmission component that connects the outboard motor gearbox to the propeller, transmitting the rotational power necessary to propel the boat. It works within the propulsion system, supporting constant torsional forces, vibrations and hydraulic loads during navigation. Its structural integrity is essential to maintain displacement efficiency and avoid cavitation problems, abnormal vibrations or loss of thrust that would compromise the maneuverability of the vessel.

When to replace this part?

Symptoms of propeller shaft wear include unusual vibrations transmitted to the hull, metallic or friction noises coming from the propulsion area, and gradual loss of traction without visible changes in engine performance. It is recommended to check the condition of the shaft and its support bearings during each seasonal maintenance, especially after navigation in waters with sediment or impacts against submerged objects. Preventive replacement of the shaft avoids the risk of complete breakage while underway, which would result in immobilization of the vessel and costly emergency repairs.

Equivalent manufacturer part numbers