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Old 09-29-2015, 03:41 PM
JimF JimF is offline
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Shaft coupling is a rusty lump, how to remove

My shaft coupler has no discernible bolt heads, and appears to be pretty well rusted onto the part it bolts onto(I don't know what to call that). I may have to cut it off the shaft and this no name part. It appears that the no-name part can't be removed without first removing the coupler, so that is out unles someone can tell me a way to do it. Transmission is direct drive (I think).

The boat goes on the hard this week so it is time to start, plan is to first cut off what left of the bolt heads and then try to drill the bolts out with left handed drill bits. followed by easy out bits to remove whats left out. I need to do this because the coupler is disintegrating and my Ranger 29 has so little room between the coupler and the stuffing box that I can't change the shaft packing without removing the coupler. Changing the packing is long overdue.

I am looking for advice I guess on how easy it is or isn't to replace this no-name piece that the shaft coupler bolts onto (3 bolts), if it turns out I need to do that, and also advice on drilling out bolts this rusty.



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Last edited by JimF; 09-30-2015 at 08:46 AM. Reason: picture added
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Old 09-29-2015, 04:47 PM
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JimF, if you have fair access and can run the engine against the dock lines try a wire brush. With the engine running in gear you can hold the wire brush against the rusty stuff and things will appear as the rust is removed, try forward and reverse. You can also just use more "Norwegian steam" and just wire brush by hand if you have the energy. Whatever feels comfortable to you.

Spray some penetrating oil into the rust as you are brushing/or holding the brush. You will be surprised how much will come off~then you can see what you are up against.

Do you have the MMI manual?

Dave Neptune
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Old 09-29-2015, 05:55 PM
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Eye protection!

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Old 09-29-2015, 06:24 PM
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I would get all dressed up with gloves, eye protection, hat and body protection. Then watch for fuel sources and go like hell with my Makita grinder. I love making sparks!!

Get back, everybody out of the way!!

Last edited by romantic comedy; 09-29-2015 at 06:57 PM.
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Old 09-29-2015, 07:55 PM
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Jim,
The 'no name' part is the output flange of the transmission. The part behind it is the shaft coupling, which has 3 bolts (direct drive) connecting it to the transmission.
To clean up the corrosion, I'd use an angle grinder with a wire wheel - one of the coarse ones where the wires are twisted into ropes. Gloves, long sleeve shirt, and safety glasses with side shields (or full face shield). You do NOT want that stuff in your eye - your PCP will send you right to an ophthalmic surgeon.
Depending on what's left after cleanup, you may be able to get the bolts started with a pair of vise grips. My next choice would be to cut a slot into what's left with a Dremel tool, and then use an impact screwdriver. Final option is left hand drills. I would advise against easy-outs - break off one of those suckers and you're in deep trouble.
But after you get the bolts out - then what? The coupling is probably corroded to the shaft, and it doesn't sound like you have much room to work. You can fight with it or just hit it with the checkbook - cut the shaft aft of the coupling, then replace the shaft and coupling. Don sells a split coupling that sounds perfect for your application.
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  #6   IP: 71.178.82.252
Old 09-29-2015, 09:26 PM
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Jim...we need some pics. They really help a lot. If you decide to grind on it first, Al's advice is good.

I fought a coupler/shaft issue several years ago...all these peeps helped me out quite a bit without resorting to drastic measures..simple, but methodical steps tackled it.
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Last edited by sastanley; 09-29-2015 at 09:34 PM.
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