Reply To: Lower Unit Drain Plug Washers

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January 24, 2020 at 4:57 pm #192973
jerry-ahrens
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    Sierra makes a fiber washer part number 18-2945. These are the old black fiber washers that Mercury used way back. They of course work on Mercury outboards and Mercruiser. I have used the Sierra 18-2945 on some 50s OMC gear cases when the nylon ones won’t seal. Note: the current Mercury washer is 12-19183 3. DO NOT use these on OMC motors. They are a ”one time use” only and once the drain/fill screw is loosened, then retightened, the washer will squash out. I keep some Sierra ones in stock, as they come in handy at times.