ALUMINUM PROPELLER 13.5X15 RIGHT 48-77342A45

Function and technical context

The propeller is the fundamental propulsion element in the power transmission chain of your Mercury outboard motor. This 13.5 x 15-inch model works directly coupled to the engine output shaft, transforming rotary energy into hydraulic thrust to move the boat. The right-turning design and its 15 splines ensure secure coupling and balanced load distribution during propulsion. The aluminum construction provides structural resistance to impacts and cavitation, while the 4 1/4-inch shell ensures hydrodynamic stability and minimizes vibrations transmitted to the hull, essential for maintaining speed and control in different navigation conditions.

When to replace this part?

You should consider changing the propeller when you observe abnormal vibrations during navigation, progressive loss of top speed without apparent cause in the engine, or visible damage such as deformations, cracks or erosion in the blades—typical symptoms of cavitation or impacts against submerged objects. It is recommended to check the condition of the propeller at the beginning of each sailing season and after any impact or grounding, since small deformations affect balance and can accelerate shaft wear. Preventive replacement of a damaged propeller avoids costly transmission system breakdowns and ensures maximum propulsion performance and safety.

Equivalent manufacturer part numbers