KEY 28-8M0032838 REC28-8M0032838

Function and technical context

The key is a critical precision component in the transmission systems of Mercury, Mariner and Mercruiser engines. Its main function is to ensure the transmission of engine torque from the input shaft to the gearbox gears, preventing any slipping or misalignment during operation. By acting as a mechanical locking element, it guarantees that the power generated by the engine is transferred in an integral and synchronized manner to the propulsion system. A worn or cracked key compromises gear shifting efficiency and can cause loss of control in critical maneuvers, especially in variable motor navigation or mooring operations.

When to replace this part?

The key should be checked periodically during seasonal maintenance, especially after sudden gear changes or if abnormal vibrations are detected in the transmission. Symptoms of deterioration include difficulty engaging gears, metallic noises coming from the gearbox or a sensation of slipping during acceleration. Although there is no fixed replacement interval, it is recommended to replace it preventively if any signs of corrosion, wear are observed or if the gearbox has recently been operated on. Changing the key preventatively is a minimal investment that avoids costly transmission repairs and ensures reliability in navigation.

Engine Compatibility

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers