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  1. #1
    Member
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    Jun 2004
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    Water Valley, MS
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    972

    Prop Nut Question (250 Pro XS)

    Why is there no washer with bend down tabs on my 2008 250 Pro XS. Every motor I have ever owned has had one. I bought the boat in May and decided to change the lower unit oil. The nut and washers were so black that I never noticed that it didn't have one. I also noticed that the threads on the prop shaft were bent a little on the end and little shavings of brass came off the nut when I removed it. Do you think it would be wise to try and get a new nut? I tightened it as much as I could with my plastic prop wrench. Is it possible to get it tight enough with this wrench?

  2. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
    Join Date
    Apr 2008
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    Greenville, SC (US)
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    98,135
    #2

    Re: Prop Nut Question (JRBjr)

    Your engine has a Torquemaster Gearcase, and utilizes a "Solid, Fat-Shaft" High Performance Hub.

    No tab washer is utilized with this hub. A beveled washer is utilized to help maintain constant torque (one of the three washers behind the nut has a slight "dish" to it).

    Probably not achieving proper torque with the plastic wrench.... the torque spec on this hub is 55 ft. lbs.

    As far as your prop nut is concerned, I'm of the "if in doubt, throw it out" mentality on that subject.



    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
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  3. Member
    Join Date
    Jun 2004
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    #3

    Re: Prop Nut Question (EuropeanAM)

    Thanks Don,

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