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peter scott
Joined: 18 Dec 2007 Posts: 7118 Location: Edinburgh
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Posted: Thu Apr 11, 2019 12:47 pm Post subject: An Awkward Nut |
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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
_________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
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Rootes75
Joined: 30 Apr 2013 Posts: 3816 Location: The Somerset Levels
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Posted: Thu Apr 11, 2019 1:05 pm Post subject: |
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That does look difficult, did the heat allow it to move at all? _________________ Various Rootes Vehicles. |
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peter scott
Joined: 18 Dec 2007 Posts: 7118 Location: Edinburgh
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Posted: Thu Apr 11, 2019 1:33 pm Post subject: |
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Unfortunately my heat didn't give me the slightest movement. Neither slackening nor tightening.
Peter _________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
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Rick Site Admin
Joined: 27 Apr 2005 Posts: 22447 Location: UK
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peter scott
Joined: 18 Dec 2007 Posts: 7118 Location: Edinburgh
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Posted: Thu Apr 11, 2019 2:12 pm Post subject: |
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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 _________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
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Minxy
Joined: 22 Sep 2010 Posts: 272 Location: West Northants
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Posted: Thu Apr 11, 2019 3:31 pm Post subject: |
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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. _________________ Hillman minx convertible. Lanchester LD 10 |
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peter scott
Joined: 18 Dec 2007 Posts: 7118 Location: Edinburgh
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Posted: Thu Apr 11, 2019 4:00 pm Post subject: |
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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 _________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon
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 Posts: 4105 Location: South Cheshire
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Posted: Thu Apr 11, 2019 4:02 pm Post subject: |
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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
Joined: 18 Dec 2007 Posts: 7118 Location: Edinburgh
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Posted: Thu Apr 11, 2019 4:12 pm Post subject: |
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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 _________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
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badhuis
Joined: 20 Aug 2008 Posts: 1390 Location: Netherlands
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Posted: Thu Apr 11, 2019 4:20 pm Post subject: |
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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. _________________ a car stops being fun when it becomes an investment |
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Kenham
Joined: 12 Mar 2012 Posts: 209 Location: Kent
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Posted: Thu Apr 11, 2019 5:18 pm Post subject: |
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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
Joined: 18 Dec 2007 Posts: 7118 Location: Edinburgh
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Posted: Thu Apr 11, 2019 5:19 pm Post subject: |
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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. _________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
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Kenham
Joined: 12 Mar 2012 Posts: 209 Location: Kent
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Posted: Thu Apr 11, 2019 5:19 pm Post subject: |
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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
Joined: 18 Dec 2007 Posts: 7118 Location: Edinburgh
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Posted: Thu Apr 11, 2019 6:00 pm Post subject: |
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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. _________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
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Phil - Nottingham
Joined: 01 Jan 2008 Posts: 1252 Location: Nottingham
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Posted: Thu Apr 11, 2019 6:30 pm Post subject: |
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OxyA will shift it if it is heated to red. However, a small sharp cold chisel in the slot will split that easily _________________ Rover P2
Rover P4
Rover P5 & P5B
Land Rover S2 & S3
Morris Mini Traveller Mk2 |
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