RETAINER 26-69189

Function and technical context

The 26-69189 seal is a critical sealing component that acts at the interface between the crankshaft and engine casing, preventing the leakage of lubricating oil to the outside and preventing the entry of salt water into the system. This seal works under conditions of continuous rotation and dynamic pressure, supporting the vibrations and movements inherent to the operation of the crankshaft. Its degradation or wear compromises the integrity of the marine lubrication system, potentially generating progressive oil loss, accelerated internal corrosion and, in advanced cases, the entry of seawater into the combustion chamber with catastrophic consequences for the engine.

When to replace this part?

Crankshaft seals present typical symptoms of aging such as visible oil drips in the crankshaft area, lubricant stains under the boat after mooring or a characteristic smell of burning oil while driving. Although there is no fixed replacement interval, it is advisable to check the condition of the seal during each seasonal maintenance and, especially, if the boat remains inactive for long periods, since exposure to salt water and temperature changes accelerates its deterioration. Preventive replacement before it begins to fail avoids costly engine repairs in port or, worse still, breakdowns while underway.

Engine Compatibility Table

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers