SEAL 26-70080

Function and technical context

The 26-70080 seal is a critical sealing component installed on the propeller shaft of Mercury, Mariner and MerCruiser engines. Its main function is to prevent the entry of salt water and contaminants into the propulsion system, maintaining the seal between the rotating shaft and the engine casing. This seal works under extreme conditions of humidity, hydrodynamic pressure and continuous rotation, being essential to preserve the integrity of the lubrication system and avoid internal corrosion that would compromise the performance of the marine engine.

When to replace this part?

Typical symptoms of seal deterioration include visible loss of fresh water or oil in the propeller shaft area, salt deposits or corrosion on the engine base, and an abnormal increase in coolant consumption during navigation. It is recommended to inspect this component at each seasonal service and replace it preventively after 5-7 years of use or if any signs of leaks are detected, since a failure at sea can cause water entry into the engine casing and structural damage that is costly to repair.

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers