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  1. #1

    Default Mercury 25HP prop won't turn

    I recently bought a boat with a Mercury 25HP. Last week when I tested it out the motor ran fine. Only thing I have done since is load it on a trailer. I was taking it out yesterday when I backed it in and cranked the motor. Motor runs fine but the prop will not turn when in gear and the engine revs up. When it is "off" the prop will turn by hand in neutral or in gear. I have a steering wheel and a friend mentioned without looking at it that it could be a broken link in the cable. Any suggestions?

  2. #2
    Join Date
    Apr 2016
    Location
    barnegat NJ
    Posts
    2,707

    Default Re: Mercury 25HP prop won't turn

    shift linkage needs to be looked at

  3. #3
    Join Date
    Dec 2015
    Location
    maplevalley WA
    Posts
    3,470

    Default Re: Mercury 25HP prop won't turn

    What is the serial number of the motor? With the motor not running in forward gear the prop should ratchet in one direction and lock in the other and in reverse it should lock in both directions. Do not turn the motor over using the prop you can damage the impeller.

  4. #4

    Default Re: Mercury 25HP prop won't turn

    Just had to replace my plastic socket on my 1988 25 hp. Located under cover on starboard side of the engine. Connects throttle linkage and shift linkage. Easy to fix if that's the problem.

  5. #5

    Default Re: Mercury 25HP prop won't turn

    Look behind the carb for the shifting linkage you may need to take the electric starter off to see it. Make sure that is moving correctly should move up and down when shifting. Also look on the side of the engine where the rods are and make sure they are connected with no broken balls or sockets.

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