I purchased a "BTA249 <B> CV JOINT NUT - MINI COOPER S"

I have a 1-5/16 3/4Sq Drive socket, but it is too small for the nut.

What size socket should I purchase?

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1978 NUGGET GOLD 1275 LS - 1380cc
1969 Morris Mini 1100cc

1 5/16 is the correct size socket for a disc brake CV nut.
It should fit the CV if you have 7.5" discs, or the 8.4" discs.

The only other size is a smaller nut fitted to drum brake and Cooper 997 disc brakes which you say is the reverse of the problem here.

What kind of brakes do you have?

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

I have 8.4 disc for LS1275

Just got the socket.

It has "CR-MO 1-5/16" on the side of it.

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1978 NUGGET GOLD 1275 LS - 1380cc
1969 Morris Mini 1100cc

Yeah then it's the right socket, but something might be fouling the nut, or there's a problem with the nut or socket.

Using a ruler, measure across the nut from flat to flat. You should get a measurement of 33.34 (to be accurate) but get the best indication you can. If it's larger than this by a margin, then the nut has probably been machined from metric stock or something similar.

Other than that, make sure the edges of the nut aren't deformed to stop the socket sliding on (You might need to persuade it a little with a hammer to slide on) and see if you can inspect and measure the socket as well (it's a little difficult to do so without verniers).

One of these will be the culprit.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

I bought one recently and was sent metric as well........annoying...........

Thanks Mick and Smac for the help

Sounds like the nut is metic. I know how it feesl Smac, it is annoying.

Now i know to take the socket with me to test the nut on the next purchase.

Thanks, again

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1978 NUGGET GOLD 1275 LS - 1380cc
1969 Morris Mini 1100cc

I bet a beer that it's metric... ones I bought recently in a CV joint as a kit were all metric...

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Lillee - 1969 Morris Mini K

The new nuts being supplied seem to be mostly metric. I could get my son to check the ones on the moke but I think they are a 31mm socket.

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1964 998 Cooper , 1968 Morris 1100

I have a 34mm socket

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Stop Licking the Dog...I Don't Care Who Started It

Show off.

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But he's thriving and striving and hugging the turns.

They are 34mm metric hexagonal bar stock now, because they are made elsewhere than UK.
It is annoying- when I got the first pair, I put them on the mill and made them 1-5/16" to fit my socket..
Since then I've bought a 34mm socket.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I've got one of each

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David L


My greatest fear in life is that when I die my wife will sell my Mini and tools for the price I told her I paid for them!

Yeap 34mm Socket - fits both

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Starlet Conversion:
http://www.ausmini.com/forums/viewtopic.php?t=15484

Let me know if you want to use it Gimpy..I'm in Baulkham Hills

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Stop Licking the Dog...I Don't Care Who Started It