TAIL YAMAHA L 21.1 6D9-45300-14-8D

Function and technical context

The propeller shaft is part of the marine propulsion transmission system, being the component that connects the engine crankshaft with the propeller to transfer the power generated. This shaft has 15 splines that ensure a firm and slip-free coupling with the internal gears of the motor tail or foot. Its correct alignment and structural condition are critical to guarantee efficient transmission of the propulsion force and avoid abnormal vibrations during navigation, which could lead to loss of performance or damage to adjacent components.

When to replace this part?

Symptoms of shaft wear include excessive vibrations in the tail of the engine, abnormal noises during acceleration or deceleration, and loss of traction or difficulty transferring power to the propeller. It is recommended to inspect the condition of the shaft during each seasonal maintenance, especially after navigation in water with sediment or after hitting submerged objects. Preventively replacing this part when the first signs of wear are detected avoids serious damage to the transmission system and costly repairs at sea.

Equivalent manufacturer part numbers