6 TEETH CAM 850307

Function and technical context

The 850307 6-Tooth Cam is a critical component of the timing and shift control system on Mercury, Mariner and MerCruiser engines. This part works in coordination with the gear shift mechanism, controlling the precise movement of the control levers to ensure smooth transitions between forward, neutral and reverse. Its correct operation is essential to maintain the response of the engine and the operational safety of the boat, since any wear on its tooth profile can cause imprecise shifting, slipping of gears or partial blockages of the propulsion system.

When to replace this part?

The cam should be replaced when sudden or inaccurate shifting, abnormal resistance is observed in the control lever, or when the tooth profile shows visible wear during maintenance inspections. Although there is no specific recommended range of hours, it is advisable to examine it every two seasons of intensive navigation or after 400-500 hours of operation. Preventive replacement of the cam during general inspections avoids costly repairs at sea and ensures safe control of propulsion throughout the season.

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers