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  1. #1
    Join Date
    Sep 2001
    Location
    Home - Sothampton, Boat - Gosport
    Posts
    10,660

    Default Refitting the prop - dumb question

    I took the prop off to clean it up and found it was barely tight on the taper, only prevented from slipping by the key and the nut held in place by the split pin. Putting it back, when everything's nice and tight, the holes in the nut don't align with the one in the shaft.

    OK, a different thickness of washer would sort it, or grinding away a bit off the bottom of the nut. but thin SS washers of a suitable size are hard to find and grinding the nut down risks a variation on a theme of the wonky table joke. Warming the prop isn't a serious option as the boat's a long way from an oven I could use and I haven't got an adequate blowlamp.

    Any other ideas, or do I just have to go with one of the above? Would a plastic washer help, as it's a bit squashable?
    Steve
    Never believe anything until it has been officially denied.

  2. #2
    Join Date
    Jun 2001
    Location
    Portsmouth Harbour
    Posts
    1,339

    Default Re: Refitting the prop - dumb question

    How about a washer made form a milk container, there is no movement so it should survive.
    Beneteau First 31.7 owners Site http://www.beneteaufirst317.webs.com/

  3. #3
    Join Date
    Jan 2004
    Location
    Bricks & mortar: Italy. Boat: Aegean
    Posts
    10,513

    Default Re: Refitting the prop - dumb question

    Quote Originally Posted by Stemar View Post
    I took the prop off to clean it up and found it was barely tight on the taper, only prevented from slipping by the key and the nut held in place by the split pin.
    If it's "barely tight" on the taper, something's wrong. Might be worth lapping it in with valve-grinding paste. The taper, not the key, should be taking the drive force.
    Equally, have you tried the prop without the key? You may find it's hanging up on the key, preventing it going fully home, in which case the key may need dressing down.
    All epigrams are false

  4. #4
    Join Date
    Jun 2005
    Location
    Mid Devon
    Posts
    6,506

    Default Re: Refitting the prop - dumb question

    Once you've done all that just re-drill the nut and shaft.

  5. #5
    Join Date
    Nov 2009
    Location
    Home UK Midlands / Boat Croatia
    Posts
    21,348

    Default Re: Refitting the prop - dumb question

    Is it not a castellated nut? You can usually turn these to the next castellation.

    If it's a nut drilled with two holes at right angles then you should still be able to make a turn of less than 90 degrees. A nut with one hole is more problematic as 180 degrees is a lot of extra torque so I would use a stainless shim or two.

    As said above, try it without the key and see what happens.

    Richard

  6. #6
    Join Date
    Feb 2003
    Posts
    15,768

    Default Re: Refitting the prop - dumb question

    Quote Originally Posted by Stemar View Post
    I took the prop off to clean it up and found it was barely tight on the taper, only prevented from slipping by the key and the nut held in place by the split pin. Putting it back, when everything's nice and tight, the holes in the nut don't align with the one in the shaft.

    OK, a different thickness of washer would sort it, or grinding away a bit off the bottom of the nut. but thin SS washers of a suitable size are hard to find and grinding the nut down risks a variation on a theme of the wonky table joke. Warming the prop isn't a serious option as the boat's a long way from an oven I could use and I haven't got an adequate blowlamp.

    Any other ideas, or do I just have to go with one of the above? Would a plastic washer help, as it's a bit squashable?
    Sounds like its riding on the key, have you inadvertently turned it around so that a longer edge is sitting up? As others have said, take the key out, slide the prop fully home and see if it grips the taper. If it does then file the key to suit so that their is a gap between the top and the prop so it doesnt ride on it. If you have a good taper grip with out the key, mark the propshaft where the edge of the prop is and then once the key is adjusted does the nut push the prop up to your mark! If it does, tighten securely and then only think about redrilling the shaft

  7. #7
    Join Date
    Feb 2010
    Location
    South UK
    Posts
    578

    Default Re: Refitting the prop - dumb question

    As Hekler says, Make sure its not riding on the key, if its not , my preference is to do away with the split pin and use a tab washer with one tab fitting into the key-way and three tabs bent over the flats on the nut.

    Plank
    Hang the Rich.

  8. #8
    Join Date
    Jun 2019
    Posts
    66

    Default Re: Refitting the prop - dumb question

    the correct way would be to fit a new nut drilled to line up with the shaft hole when everything is done up tight.. ie; tighten the nut correctly having mark the end of the shaft with the orientation of the split pin hole. Extend this line across the face of the nut and remove before drilling. Stainless is soft and is easy to work. Don't drill the hole with the nut in place because as you break into the hole in the shaft you'll break the drill !!

  9. #9
    Join Date
    Oct 2018
    Location
    A Member State of the European Union
    Posts
    7,527

    Default Re: Refitting the prop - dumb question

    I would just file down the mating face of the nut but then I am lucky in having been taught how to file flat.
    "Brexit: like watching a library being burned down by people who can't read"

  10. #10
    Join Date
    Nov 2001
    Location
    Medway
    Posts
    20,227

    Default Re: Refitting the prop - dumb question

    or you step into the 21st century....have you ever tried to drill stainless.
    Buy a stainless Nyloc type nut from any of the sterngear outfits, for the really careful, buy stainless tab lock washer at the same time.Torque it up exactly, no slightly to tight or too loose trying to line up that stone age split pin and you can pop on different prop with different sized boss in seconds.

    https://shop.tnorrismarine.co.uk/pag...opeller-shafts
    Last edited by oldgit; 10-11-19 at 20:50.

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