PIN KIT 1.83:1 12/22 43-803498T1

Function and technical context

This sprocket kit constitutes the core of the gear reduction system in 40 to 50 hp three-cylinder Mercury engines, responsible for transforming the crankshaft revolutions into the speed and power of the propeller. The 12 and 22 tooth gears, with a 1.83:1 reduction ratio, work in the marine gearbox, transmitting the engine's power to the propeller with the torque necessary for the efficient movement of the boat. The precision and condition of these sprockets is critical to maintain throttle response, avoid vibrations in the transmission and prevent propeller slippage during maximum load maneuvers.

When to replace this part?

Sprocket wear is manifested by abnormal metallic noises in the gearbox (squeaking or creaking, especially when changing gears), progressive loss of propulsion power, or difficulty engaging gears smoothly. Although marine gears are designed for high durability, it is advisable to inspect the condition of the pinions every 500-600 hours of operation or annually if use is intensive, especially in saltwater boating where corrosion accelerates wear. Preventive replacement of the kit before complete failure occurs prevents running out of propulsion in the water and protects other drivetrain components from cascading damage.

Mercury and MerCruiser Engine Compatibility

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers