Reply To: Substitute for OMC Shift O-ring #301877, Sierra 18-7100

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October 3, 2024 at 1:49 pm #291324
William Jatzek
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    LARRY CATON wrote:

    I’m going to try some of the Mercury O-RING 25-85594 and see how well they fit. They’re OEM for Mercury and the Sierra 18-7100 is supposed to cross. The size is given as 0.239″ x 0.174″. That would make it a little snug on the shift shaft, and 0.578″ OD vs 0.555 OD on the OMC o-ring. That’s an OD difference of 0.023″. Interestingly, the ones I ordered are orange.

    I like to experiment. Who knows, the Mercury might make a better seal.

    Mabbe the orange is that viton rubber that is alcohol resistant. Let us know how they work.