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Mercury outboard problem

Something seems to be slipping in the lower unit

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If you have a spare prop try it. The prophub of your current prop may have a bad Rubber bushing. There are some OMC units which have a 2 piece design that still has the Rubber bushing but the prop is a separate piece and the inner hub is sold separately.

Most Mercs have the Rubber hub as part of the prop. The Rubber hub in any case is taking the place of a shearpin. The Rubber starts to slip or crumble and then you can't go anymore. Sometimes the damage is visible but only sometimes.

For the 1 piece system the Hub needs to have a new Rubber bushing installed at a Prop shop. With luck, the prop is your only problem.

Posted on Aug 04, 2010

  • lighthousefa Aug 04, 2010

    already tried a prop .. that was my first thought also, I also readjusted linkage as I just replaced water pump ...... I am a machinist with lots of mechanical back ground.
    I see in a manual the gear set on prop shaft and a shifting dog and pin.
    Not having been inside on of these LU not sure exactly how this works or
    if there is something typically wears and allows it to slip.
    Just bought this boat "used" have tried it after each attempt of fixing so far and
    each time it work fine for 10 to 20 min. then slips with half throttle or more

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