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An Awkward Nut
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peter scott



Joined: 18 Dec 2007
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Location: Edinburgh

PostPosted: Thu Apr 11, 2019 12:47 pm    Post subject: An Awkward Nut Reply with quote

The rear casing on my gearbox has a crack in it that I have been living with for many years but I do have a spare gearbox so I thought I might swap its casing onto the box in my car.

Unfortunately I'm really struggling to even start the job because I can't get the nut off the drive flange on my spare gearbox.

There was part of a pin punch lodged in the split-pin hole so some previous owner has clearly attempted removal but having removed the pin punch I thought there was still the remnants of the split-pin head end lodged in the hole. I was unable to punch it out so I tried grinding it off with a small Dremel type disc.

It now looks virtually clear of the castellations but even after applying heat and using a very large spider it appears immovable. I suspect that if I had access to oxy-acetylene heat I could move it but unfortunately I don't have.

Any suggestions?

Peter




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Rootes75



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PostPosted: Thu Apr 11, 2019 1:05 pm    Post subject: Reply with quote

That does look difficult, did the heat allow it to move at all?
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peter scott



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PostPosted: Thu Apr 11, 2019 1:33 pm    Post subject: Reply with quote

Unfortunately my heat didn't give me the slightest movement. Neither slackening nor tightening.

Peter Sad
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Rick
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PostPosted: Thu Apr 11, 2019 1:48 pm    Post subject: Reply with quote

As there's no room for a nut splitter, would a small sharp chisel get the nut off, or at least split enough to break its grip on the thread?

RJ
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peter scott



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PostPosted: Thu Apr 11, 2019 2:12 pm    Post subject: Reply with quote

I probably could split the nut although I'm not sure how easy it would be to find a replacement so I'm kind of putting that suggestion into the desperation category for the time being.

I'm currently making enquiries for someone who would let me use their oxy-acetylene to get some proper heat on the nut.

Thanks,

Peter
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Minxy



Joined: 22 Sep 2010
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PostPosted: Thu Apr 11, 2019 3:31 pm    Post subject: Reply with quote

The obvious thing would be to pop it to your local garage or tyre fitters ( they will have a commercial size gun) and use an impact wrench to ‘rattle it off’ -probably only cost you a fiver.
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peter scott



Joined: 18 Dec 2007
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PostPosted: Thu Apr 11, 2019 4:00 pm    Post subject: Reply with quote

The disadvantage of tyre fitters is the lack Whitworth sockets and although I do have a socket I'm not sure I would trust a multi-angle socket as against my spider whose sockets are simple hex. The nut is not very thick.

Thanks,

Peter
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Last edited by peter scott on Thu Apr 11, 2019 4:03 pm; edited 1 time in total
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ukdave2002



Joined: 23 Nov 2007
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PostPosted: Thu Apr 11, 2019 4:02 pm    Post subject: Reply with quote

Namrick stock slotted nuts in must imperial dimensions, if you know what the thread is, and they stock them, then I'd split the nut either with a splitter or simply drilling straight down between the castles.

Dave
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peter scott



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PostPosted: Thu Apr 11, 2019 4:12 pm    Post subject: Reply with quote

Thanks Dave. It's 3/4" BSF castle and they do stock them although they don't quote the thickness which in my case is 1/2" (perhaps rather thin).

I guess I could turn a Namrick nut down if need be.

Peter
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badhuis



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PostPosted: Thu Apr 11, 2019 4:20 pm    Post subject: Reply with quote

There seem to be enough room to use a dremel with a small cutting disk. You should be able to grind away one side of the nut up to the thread.
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Kenham



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PostPosted: Thu Apr 11, 2019 5:18 pm    Post subject: Reply with quote

A 3/4 drive socket and a long bar and a large hammer, don't worry about whit or AF or metric as when you get to that size most things fit anything. A torque multiplier would help if you know a friendly plant fitter and you can hold the flange tightly enough. Or as has been said split the nut, or with a oxy torch just heat one flat of the nut to expand it , looks like that big flame is heating the shaft as well as the nut.
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peter scott



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PostPosted: Thu Apr 11, 2019 5:19 pm    Post subject: Reply with quote

It'a a difficult compromise between small enough disc diameter to get in without grinding the flange and large enough for the shaft to avoid fouling the flange. I suspect my choices would be Rick's chisel or Dave's drill.

Thanks,

Peter.
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Kenham



Joined: 12 Mar 2012
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PostPosted: Thu Apr 11, 2019 5:19 pm    Post subject: Reply with quote

A 3/4 drive socket and a long bar and a large hammer, don't worry about whit or AF or metric as when you get to that size most things fit anything. A torque multiplier would help if you know a friendly plant fitter and you can hold the flange tightly enough. Or as has been said split the nut, or with a oxy torch just heat one flat of the nut to expand it , looks like that big flame is heating the shaft as well as the nut.
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peter scott



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PostPosted: Thu Apr 11, 2019 6:00 pm    Post subject: Reply with quote

Yes, my big propane torch is pretty useless for this sort of thing. I've never failed with a nice concentrated oxy flame. I have a few possible friends for this.

Thanks,

Peter.
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Phil - Nottingham



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PostPosted: Thu Apr 11, 2019 6:30 pm    Post subject: Reply with quote

OxyA will shift it if it is heated to red. However, a small sharp cold chisel in the slot will split that easily
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