MERCURY PIN KIT 43-881260A3

Function and technical context

This sprocket kit is part of the transmission and gearbox reduction system in Mercury and Mariner engines. The 29-tooth pinion acts as a critical element in the kinematic chain that transmits the engine's power to the propeller, ensuring the correct reduction and torque multiplication ratio. A worn or damaged pinion causes vibrations, abnormal noises in the transmission, loss of propulsion efficiency and even blocking of the reverse gear system, compromising the maneuverability and safety of the boat.

When to replace this part?

Symptoms of wear on sprockets include metallic noises or grinding noises in the gearbox, difficulty engaging gears, excessive vibration during acceleration and progressive loss of power in propulsion. Although there is no fixed replacement interval, it is recommended to inspect the condition of the sprockets at each annual inspection or every 100-200 hours of navigation, especially in boats that operate in salt water. Replacing this component preventively avoids costly breakdowns at sea and ensures the reliability of the propulsion system.

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers