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Shaft coupler issues
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ultrarunner View Drop Down
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    Posted: June-04-2013 at 10:33pm
A friend is working on checking shaft alignment and he said the shaft coupler comes right of. Some sort of key-way, set screw setup. But the set screws don't line up, as the dimples are 90 degrees to the keyway and the set screws 45 degrees. My friend was given a spare shaft with the boat with the dimples at the proper position. Would this be the proper shaft?

This is on an older Martinique BR. See pics...
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ultrarunner View Drop Down
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Points: 1846 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ultrarunner Quote  Post ReplyReply Direct Link To This Post Posted: June-04-2013 at 10:52pm
Even though these couplers are press-fit into place, are they all still setup with the keyway? I have a new boat but have never had the coupler off the shaft. Intel on here indicates these couples down't come off easily ;-)
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baitkiller View Drop Down
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That shaft looks worked.
A good machinist can knurl it(coupling end of shaft) if its within a certain wear ratio and regain the heat shrink fit. You can also go with a split coupling bored and mill-matched.
What cannot happen is to re-install a loos coupling and rely upon the grub screws and key stock.

It is all coming out and going to the Dr.s office. >> pull it.
Jesus was a bare-footer.............
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I don't think knurling will provide the same solid connection as a correct size. You end up messing with it soon if you just knurl it.
“Beer is proof that God loves us and wants us to be happy.”

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baitkiller View Drop Down
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Originally posted by SNobsessed SNobsessed wrote:

I don't think knurling will provide the same solid connection as a correct size. You end up messing with it soon if you just knurl it.


That is a matter of degree and the vernier calipers have not yet spoken..
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Originally posted by SNobsessed SNobsessed wrote:

I don't think knurling will provide the same solid connection as a correct size. You end up messing with it soon if you just knurl it.

I totally agree. The coupling is fretted from misalignment. Knurling is a poor way to repair a bad fit.

If the shaft is still good, a new coupling half is needed bored to match the shaft.

The dial indicator on the front of the shaft isn't going to tell much since you will get too much movement without any support. I'd get it out of the boat and set up in V blocks to check it.


54 Atom

77 Tique

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Keep it original, Pete
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eric lavine View Drop Down
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did you guy's forget about split type couplings?
"the things you own will start to own you"
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8122pbrainard View Drop Down
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Originally posted by eric lavine eric lavine wrote:

did you guy's forget about split type couplings?

I haven't! However, I always worry about how concentric the run as well as the imbalance they may cause.

My ARE just came today for my Tique. Eric you maybe missed it but my son trashed the Tique last fall. New prop, shaft and strut> The strut was pretty bad. In the press, the old one showed a crack when I was trying to straighten it.


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77 Tique

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Keep it original, Pete
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Bones71 View Drop Down
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Pete, I also received my ARE shaft today. I'm very excited to install it. Are you planning on using the nylock nut that came on it? Also I'm putting a brand new prop on it..... Lapping the new prop on a brand new shaft should be a cake walk right? Not that it's that hard but it will be a new procedure for me. Thanks, Tony.
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8122pbrainard View Drop Down
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Tony,
Yes, I do plan on using the brass nylock nut. I haven't removed it from the shaft yet to see if there is a cross drilled hole for a cotter but I have a feeling there isn't one. Don't forget, the nut is there to seat the prop on the taper and really doesn't hold the prop onto a properly lapped taper. I have commented before that I have seen boats without any nuts!!

Lapping is VERY important on a new prop and shaft. Tapers can be off and the lapping matches the taper.


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77 Tique

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Bones71 View Drop Down
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Thanks Pete.
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Gary S View Drop Down
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I have commented before that I have seen boats without any nuts!!

That's it! my new signature line
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cphase View Drop Down
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Reckon boats are the only thing around Pete' house with "NO NUTS"!
Thanks,

Jeff
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8122pbrainard View Drop Down
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Originally posted by Gary S Gary S wrote:

I have commented before that I have seen boats without any nuts!!

That's it! my new signature line

I knew it as soon as I posted it that someone would have to comment! CQ and HW must not be on site!!


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77 Tique

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Keep it original, Pete
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baitkiller View Drop Down
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Originally posted by eric lavine eric lavine wrote:

did you guy's forget about split type couplings?


Four posts above yours.
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