YAMAHA TAIL 69K-45300-21-8D

Function and technical context

The propeller tail or sleeve is a critical structural component that surrounds and protects the drive shaft and steering mechanisms of the propulsion unit. This piece works in the marine propulsion system, continually exposed to the most adverse conditions: salt water, currents, sediments and temperature variations. Its integrity is essential to maintain the tightness of the engine, prevent water from entering the internal cavities and guarantee the efficient transmission of engine power to the propeller. A deterioration or breakage of the tail compromises the protection of the transmission system and can allow water infiltration, which would cause serious damage to internal components.

When to replace this part?

Cracks, visible breaks, material detachments or deformations in the glue are obvious signs that it requires immediate replacement. Although the tail does not have a fixed preventive maintenance interval like other components, it is advisable to inspect it at each seasonal inspection, especially after impacts, groundings or navigation in shallow waters with a rocky or coral bottom. Replacing the tail as soon as damage is detected avoids the risk of water leaks into the engine and costly repairs to the propulsion system while you are sailing.

Equivalent manufacturer part numbers