Mark 28

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    Matthew Pieklik

    US Member - 2 Years
    Replies: 21
    Topics: 19
    #205802

    Question- Is there a gasket between the gear case and the mid section on a Mark 28? Looks like there should be but don’t see any mention of it in my paperwork. Thanks , Matt.

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    dave-bernard

    US Member - 2 Years
    Replies: 1165
    Topics: 14
    #205804

    No gasket.

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    billw

    US Member - 2 Years
    Replies: 1254
    Topics: 41
    #205808

    No gasket but there’s a good size o-ring just above the gear case split, and that’s what seals the water out of the upper and lower gear oil chambers. There is also a water passage between the two. I like to put a small amount of sealant around the outside of this passage. When the boat gets up on plane, that is a passage with negative pressure and is prone inducing air into the water flow.

    Long live American manufacturing!

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    dave-bernard

    US Member - 2 Years
    Replies: 1165
    Topics: 14
    #205809

    after the pump is primed the motor on plane the seam should be under water and no problem.

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    billw

    US Member - 2 Years
    Replies: 1254
    Topics: 41
    #205864

    I respectfully disagree about where that seam rides. I have roughly thirty auto-trans motors and look over the back of my little boat all the time. The seam might be in spray but it is not in solid water, at least not on 12 foot boats. Also, auto trans motors are such a pain to do a pump on properly, and the impellers are so susceptible to taking a bad set, that I feel anything I can do to make them last even a bit longer, is well worth it.

    Long live American manufacturing!

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