BOARD 12-86645 REC12-86645

Function and technical context

The 12-86645 gasket is a precision sealing component designed to ensure air tightness in the critical marine propulsion systems of Mercury, Mariner and Mercruiser engines. This washer acts as a closing element in highly demanding areas where absolute tightness is required to prevent fluid leaks, water entry or pressure loss in the internal circuits of the engine. Its correct installation is essential to maintain the structural integrity of the propulsion system and prevent secondary damage from corrosion or salt water infiltration.

When to replace this part?

The gasket must be replaced whenever the area where it is installed is dismantled, since sealing materials lose their compression capacity after being subjected to pressure. If you notice leaks of coolant, fuel or other fluids in areas close to joint points, or detect moisture in crankcases after periods of storage, it is a sign that the gaskets have lost effectiveness. Preventative replacement during annual maintenance checks avoids costly offshore repairs and significantly extends engine life.

Engine Compatibility Table

Compatible MerCruiser and Mercury Mariner Engines

Equivalent manufacturer part numbers