ALUMINUM PROPELLER 13X19 RIGHT 48-77346A45

Function and technical context

The 13x19 aluminum propeller with 15 splines is the direct propulsion element of Mercury 2- and 4-stroke outboard engines, transmitting the engine's power to the water through its controlled rotation. This part works in the propulsion system, coupled directly to the engine output shaft, and its 4 1/4" nautical precision housing design ensures secure coupling and optimal hydrodynamic performance. The propeller geometry (19-inch pitch and 13-inch diameter) is calibrated for engines between 40 and 140 hp, allowing controlled accelerations and efficient cruising speeds. Progressive wear or damage to the blades significantly reduces available traction, increases fuel consumption and can cause vibrations that damage the drive shaft and engine bearings.

When to replace this part?

Aluminum propellers lose efficiency when they present deformations in the blades, visible cavitation (pinpoint erosion on the edges), or impacts due to contact with rocks and submerged objects, symptoms that generate loss of power, jerks or capsizes during navigation. It is recommended that the propeller be inspected at each seasonal maintenance and although aluminum is resistant to marine corrosion if properly maintained, preventive replacement after 5-7 years of heavy use or after impact prevents costly emergency repairs to the output shaft and engine gearbox.

Equivalent manufacturer part numbers