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Propeller nut almost off

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  • Propeller nut almost off

    Propeller nut almost off then propeller started spinning free. 90HP Mercury 4 stroke 2007 EFI. How do I keep shaft from spinning to finish removing nut?

  • #2
    Propeller nut almost off then propeller started spinning free. 90HP Mercury 4 stroke 2007 EFI. How do I keep shaft from spinning to finish removing nut?

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    • #3
      Wedge a block of wood between the prop and the anti ventilation plate. It’s wood, it won’t damage either one. There are several videos on YouTube to show how to remove a prop. Is the prop spinning on the prop shaft?
      1990 Wellcraft Eclipse 196
      Mercruiser Vortec 4.3 0M322285
      Alpha gen 1

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      • #4
        The prop is spinning on the prop shaft. That’s how I got it almost all the way off with the wood. I didn’t know if there was a good way to hold the aft adapter or something else I’m missing

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        • #5
          The prop is splined to the prop shaft. If it (blades and all) is spinning on the shaft, the interface between the brass splined core (that contacts the shaft) and the propeller casting (which includes the blades) has been damaged. On a replaceable prop-hub the core is plastic and brass and apparently has sheared. On non replaceable hubs the interface is a pressure fitted rubber insert that is designed to slip when hitting an obstruction and reseat once the operator cuts the throttle to idle and then powers back up resuming whatever condition existed prior. The rubber inserts usually reseat and essentially "heal". The plastic shears and you are dead.

          iboats sells plastic/brass inserts to fit your prop-engine shaft. Prop shops can replace the rubber boot. If you are talking about an alum prop on a 100 hp engine (for a number) they sell them on here for about a hundred bucks brand new.....wink! You get all new parts.

          When installing whatever you decide upon, nut torque is on the order of 55# at the 100 hp level.
          If you are new to boating or have a new boat, a knowledgeable friend could show you how to operate your boat and save you a lot of grief, maybe some money, and maybe your life.

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          • #6

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            • #7

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              • #8
                Try putting it in gear.
                1980 Sylvan Aluminum 18' Sportster I/O - Mercruiser 140, Honda 7.5 Kicker, Bennett M120 Tabs
                1974 Glastron V-179, Mercruiser 140
                1984 16.5ft. Alumarine Sealark side console with 82 Merc 50
                Manitoba, Canada

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                • #9
                  I tried it in gear and it’s not strong enough to hold it. I’m using channel locks on the adapter to hold while in gear but they keep slipping off because they’re at an angle on the adapter from the hub recess

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                  • #10
                    I took a Dremel tool with a little cutoff wheel and split the nut to get it off

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                    • #11
                      Sign up today
                      Sometimes that's what it takes.
                      Glad you got it off.
                      1980 Sylvan Aluminum 18' Sportster I/O - Mercruiser 140, Honda 7.5 Kicker, Bennett M120 Tabs
                      1974 Glastron V-179, Mercruiser 140
                      1984 16.5ft. Alumarine Sealark side console with 82 Merc 50
                      Manitoba, Canada

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