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Thread: prop puller

  1. #21

    Re: prop puller

    well I rearlly put the boat on plane , we ran back at 1250rpm 10.5kts and I'll only be useing it to go to the beach or cruies around Naples the water is getting cold now so I wont be useing as much maybe once per month and no more long distance stuff.
    CARL GUZMAN Worrying is interest on a problem that has not yet occurred
    2002 Endeavour Catamaran 44
    NAPLES, FLORIDA

  2. Re: prop puller

    Quote Originally Posted by Genesis
    Do not pull and replace wheels underwater EXCEPT in DIRE emergency.

    The reason is that you CANNOT properly lap a prop and shaft in the water. It is flatly impossible.
    Okay Pooh Bear,

    I'm going to show my ignorance. What are you referring to when you are talking about "lapping" a prop and shaft? I've done a couple of underwater prop changes, but they've been smaller props in freshwater. Never had any problems. Clue me (us) in, would ya?
    1974 58TC "Freebird", 1965 41DC "Nancy Cay", For Sale - Click HERE for info - sosectn@aol.com
    Randy Register - Kingston, Tennessee - aka Freeebird aka Sparky1
    www.forumlychallengedboaters.com

  3. Re: prop puller

    A morse taper joint (which is what a prop and shaft is) MUST be lapped together to fit right. Fit correctly, you actually do not need a key.

    Fit incorrectly, the prop will slip on the shaft, load the key, which will then initiate a crack in the shaft and we know what happens next, right?

    To lap the wheel and shaft you put some valve grinding compound on the shaft and then put the wheel on and rotate it (by hand) for "a while". It could be anywhere from a dozen turns to well north of a hundred, depending on how far out of true the shafts and bore are.

    You then clean that off and put some prussian blue on the bore and then rotate it and see how much contact you've got. 100% is perfect, but nothing under 80 should be tolerated.

    This insures that the wheel, when mounted, properly seats on the taper. Without intimate contact the taper will not properly take the load.

    This is one of those "do it right or spend $5,000+" things, because a busted shaft doesn't just cost you a shaft - it also almost always costs you the prop too, and sometimes does significant damage to a strut, rudder or the hull on the way out.
    http://www.denninger.net - Home page with blog links and more
    http://market-ticker.org - The Market Ticker

  4. #24

    Re: prop puller

    I told this to my mechanic about the lapping and he said because I used the props that where in the boat as back up they where already on the boat once and should lap fine , but he did say I should double check the nuts.

    I just got to looking at my files of pictures I have on the boat and realized the bolt patern is wrong small nut last I just hope who ever did it last time did it right???
    Attached Images
    Last edited by CARL GUZMAN; 10-13-2006 at 03:25 PM.
    CARL GUZMAN Worrying is interest on a problem that has not yet occurred
    2002 Endeavour Catamaran 44
    NAPLES, FLORIDA

  5. #25

    Re: prop puller

    Carl (and Karl), I lap the wheels on every time I pull them off. Is this unnecessary?
    Jim R

  6. Re: prop puller

    Quote Originally Posted by jim rosenthal
    Carl (and Karl), I lap the wheels on every time I pull them off. Is this unnecessary?
    Jim R
    No, its very necessary, and you are doing it right! Keep doing it!
    http://www.denninger.net - Home page with blog links and more
    http://market-ticker.org - The Market Ticker

  7. Re: prop puller

    Now you guys have me worried. I banged the props on FREEBIRD coming into a private channel at low tide, at night, off Anclote Key on the return from my "Maiden Voyage From Hell". I knew it was going to be close, but I'd had enough for the day and wasn't about to spend the night on the hook without a generator.

    There was a spare set of props on the boat that had previous damage. I had General Propeller in Bradenton repair both sets. The diver said he put back on the best of the two pairs. Unfortunately, I don't know which pair went back on. The ones I damaged, or the ones the PO damaged. Should I be worried? As was the case with Carl, both sets had been on the same shafts at some time or another.
    1974 58TC "Freebird", 1965 41DC "Nancy Cay", For Sale - Click HERE for info - sosectn@aol.com
    Randy Register - Kingston, Tennessee - aka Freeebird aka Sparky1
    www.forumlychallengedboaters.com

  8. Re: prop puller

    There is no way to know without checking them out of the water, and of course once you do that, you've got 'em off and can mount 'em right!

    Its a total crapshoot as to whether or not they're on the shafts with adequate "grip".
    http://www.denninger.net - Home page with blog links and more
    http://market-ticker.org - The Market Ticker

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