Onyva
regular
Reged: 14/02/2005
Posts: 43
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Have just had to CUT my very expensive Gori prop off my propshaft as neither I nor the yard could remove it the conventional way (after several attemts over several weeks).
So, I have dug out the original (still gleaming) fixed prop, that has never been used, and am planning to fit that whilst we check out OTHER folding props. BUT I can't see how the prop will stay on with just one nut ane one cone shaped anode on the end - even when they are loctited. Stupid question I know but we've had a folding prop for so long......
For those who are interested, the reason for removing the Goriprop was that Gori in Denmark refused to sell me any spares & insisted I remove it & send it back to Denmark for them to check it out - even after I told them it was impossible and that we woulmd have to cut it off if they didn't. Yes, I'm still crying! 
Here's to tall ships
Here's to small ships
Here's to all the ships on the sea
But the best ships are friendships
Here's to you & me
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bigwow
regular
Reged: 26/02/2006
Posts: 1397
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Split pin through the nut and shaft?
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highandry
regular
Reged: 17/02/2006
Posts: 359
Loc: South Coast UK
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Run a second nut onto the shaft so that the end of the shaft is flush with the face of the nut. Then use a good quality centre punch, put the tip on the "join" between the end of the steel prop shaft and the lock nut (looking at it from astern) and strike the punch with a hammer. Do this in 4 or 5 evenly spaced points round the junction of the nut and the shaft. It will stop the nut loosening. To get it off you will need a good socket and long bar for leverage.
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npf1
regular
Reged: 09/10/2004
Posts: 1112
Loc: SE
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I've seen arrangments with a grubscrew or allen bolt drilled & tapped into the nut.
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highandry
regular
Reged: 17/02/2006
Posts: 359
Loc: South Coast UK
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Yes, a much more professional method certainly. I was unsure wether onyva was just wanting something temporay until he's found a new fandangled feathering prop. 
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Tranona
regular
Reged: 10/11/2007
Posts: 1377
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How did you "cut it off"? Assume it is on a taper and keyway so I hope you have not cut anything off the shaft. The normal way of ensuring the prop does not come off is first to make sure that it is machined to the correct taper, slide it on the shaft until it bottoms on the taper and then put a lock nut on. Easiest way of ensure the lock nut does not come off is to use a castellated nut and drill the shaft for a locking split pin. Alternatives are to use a lock washer with one ear bent to the prop and the other to the nut, or drill and tap to take a socket headed grubscrew. You may find that you don't need a cone anode with a fixed prop if you have a hull anode close, or a shaft anode is easier to fit.
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CodStewart
regular
Reged: 11/01/2005
Posts: 790
Loc: Tashkent
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My prop wobbles. I tightened it when it was in the yard, took the boat out, used the engine, put the boat back on the hard, and noticed that the prop was wobbly again.
Does this mean that there's something wrong?
--------------------
www.ihaveaboat.blogspot.com "Only The Educated Is Free"
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Tranona
regular
Reged: 10/11/2007
Posts: 1377
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Yes. If the taper is machined correctly - both shaft and prop it should not move. Usually the difficulty is in actually shifting a prop rather than it falling off. When the prop is fully on there should still be thread showing so that the nut tightens against the prop. If the tapers are correct and the thread is too short, put additional washer(s) behind the nut.
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neutronstar
regular
Reged: 09/09/2003
Posts: 52
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I made a puller out of 25mm thick high carbon steel plates and 25mm stainless studs & nuts (like a bendix compressor) with facilities for twin & multi bladed props. "They come off with that !" Sometimes a bit heat is needed. In all cases you really need to use grinding paste to bed the new prop in. The grey marks left on shaft & prop indicate the fit and if necessary the prop needs to be spun quite a bit. When bedded on 100% it won't shift with a good key & castled nut.
That fit is all important, if the thing wobbles it will pop off in time.
www.johnhansen.co.uk
SAILING ! (there's worse things you can do with your life) <;-)
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Relax
regular
Reged: 18/04/2007
Posts: 161
Loc: ked out again!
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Ida thought that pinging out the key with a small chisel, lapping with coarse then fine grinding paste till it fits, then re-fit the key and prop with perhaps some Loctite Shaftloc or something similar would do the trick.
It should also be done up to the correct torque - which I think is usually F*****g tight.
I had the case of the shaft anode loosening - but I think that was because it was a cheap crappy anode without the steel insert to hold it in place properly.
--------------------
All men dream, but not equally.
Those who dream by night, in the dusty recesses of their minds,
wake in the day to find that it was vanity.
But the dreamers of the day are dangerous men,
for they may act their dreams with open eyes, to make it possible.
- T.E. Lawrence -
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