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Shaft coupler won't go back on? |
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rfarkash 
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Joined: September-06-2011 Location: Plainville, MA Status: Offline Points: 116 |
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 Topic: Shaft coupler won't go back on?Posted: March-10-2012 at 5:45pm |
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What did I do wrong? Heated coupler to 475 deg in the oven for 1 hour +, shaft in cold garage around 35 deg. Put key in slot, coupler on shaft, then had wife smack the end of drive shaft (under boat). Used shims of wood between tranny and coupler, as well as on end of shaft for protection. Only got the coupler on about half way before it stalled out.
Will have to remove and try again, but want to know what I should do differently next time. Thanks Ron |
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eric lavine
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Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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Posted: March-10-2012 at 6:02pm |
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no burrs? you may have to heat additionally with propane or mapp gas torch
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"the things you own will start to own you"
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rfarkash
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Joined: September-06-2011 Location: Plainville, MA Status: Offline Points: 116 |
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Posted: March-10-2012 at 7:07pm |
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No burrs - cleaned Id prior to heating. Will putting that much heat on the coupler
Risk warping it? Thanks Ron |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: March-10-2012 at 7:11pm |
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You got it off so I would think you would be able to get it back on especially with the heat. What did the fit "mic" out too? I'd say off hand you didn't get it on quick enough. Time to start over! I've been there!
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rfarkash
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Posted: March-10-2012 at 7:44pm |
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Just under .001". Not sure how much faster I can do it. Brought coupler straight from the oven
Into the boat, and wife immediately started hammering. Probably 30 sec from oven to first hit. Stalled out after 2 minutes or so. Should I not have the key in the shaft? Thanks Ron |
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SNobsessed
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Posted: March-10-2012 at 8:22pm |
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Ron - You need the key there during assembly. I'd file the key down to a looser fit, that may be the problem. When I did this operation, the coupler slid on all the way without any tapping. I heated mine on the barbie, maybe I had it hotter. You might also want the shaft colder (put an ice bag on it, or even dry ice).
Next time, I am switching to a double taper shaft - this operation is kind of dangerous! |
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: March-10-2012 at 8:42pm |
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Ron,
Just under .001" is on the tight side but still doable but, as Chris mentioned you need to get ALL of the tolerances "dialed" in before you go for the shrink fit. Yes, the ARE double taper is a fantastic product and sure relieves us from some of our prop shaft install issues! |
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politicallycorrect
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Joined: May-19-2011 Location: vermont Status: Offline Points: 239 |
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Posted: March-10-2012 at 11:01pm |
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Anybody ever try liquid nitrogen on the prop shaft? I remember my dad using it to drop sleeves into a cummins 220 he rebuilt.
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Skin grows back...fiberglass doesn't!!
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eric lavine
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Posted: March-11-2012 at 11:25am |
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it would take alot for a mapp or propane to turn it purple, know the limitations, flash heat the whole thing up in the boat after the oven, personally Ive never had to hammer one on, and have done many, normally i will put a piece of tape on the shaft for a stopping point in order to not go on so far....i gettem hot
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"the things you own will start to own you"
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rfarkash
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Joined: September-06-2011 Location: Plainville, MA Status: Offline Points: 116 |
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Posted: March-11-2012 at 8:17pm |
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The key was the key! After getting the coupler off (once more cursing under my breath), took a good look at the shaft and coupler. Hit the Id with some 400 grit paper to make sure no remaining burrs, then realized the key was hanging up in the coupler slot ( free on the shaft side). Filed the key slot to remove rust/ crap in the slot, and some corner reliefs on the key. After that key slid nicely in the coupler.
2 hours at 500f in the oven, and it slid right on , easy as pie! No hammering needed. So for anyone tackling this job, my word of advice is check the key in both slots to make sure nothing is hanging up. Thanks all for the help and encouragement. Now onto the alignment... Ron |
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