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Nut size

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Nut size
#1
tvrgeek Silver Member Scott S
Hillsborough, North Carolinia, USA   USA
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1973 Triumph Stag
What is the actual wrench size for the nuts on the SU carb linkages? It is not SAE or Metric. "Adjustable" is not a good answer : ) Is it Whitworth? Do the "universal" sockets do a better job on it?


Cogito ergo sum periculoso

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Re: Nut size
#2
RAY 67 TOURER Avatar
RAY 67 TOURER Ray Marloff
Fort Bragg, CA, USA   USA
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1967 MG MGB "My Girl"
I believe that they are 1/2". Maybe 13 mm. RAY

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Re: Nut size
#3
dickmoritz Avatar
dickmoritz Platinum Member Dick Moritz
Philly 'burbs, PA, USA   USA
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IIRC it's 7/32...

Dick


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Re: Nut size
#4
RAY 67 TOURER Avatar
RAY 67 TOURER Ray Marloff
Fort Bragg, CA, USA   USA
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1967 MG MGB "My Girl"
Linkage. I thought he was referring to the actual size of the carburetor shaft nut. RAY

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Re: Nut size
#5
dipstick Avatar
dipstick Kenny Snyder (RIP)
La Center, WA, USA   USA
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1941 Ford N-Series
1958 MG MGA 1500 Coupe "Rosie"
1970 MG MGB GT "Pat's GT"
1971 MG MGB "Gifted To Me"    & more
If referring to the in between carbs linkage, 5/16" six-point or 8mm six-point. Just checked on the '71 HS4. It is 21*F in the garage.cool smiley


Be safe out there.
Kenny

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Re: Nut size
#6
dickmoritz Avatar
dickmoritz Platinum Member Dick Moritz
Philly 'burbs, PA, USA   USA
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Thanks, Kenny... thumbs up

OP's avatar shows a 74, which would have HIF's, and I believe they use a different size jam nut on the idle speed screw, which may be the 7/32 I was thinking of...

Dick

In reply to # 3431818 by dipstick If referring to the in between carbs linkage, 5/16" six-point or 8mm six-point. Just checked on the '71 HS4. It is 21*F in the garage.cool smiley


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Re: Nut size
#7
barry s Avatar
barry s Barry Stoll
Alexandria, VA, USA   USA
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1972 MG MGB GT
1974 MG MGB
1976 Triumph TR6
1980 MG MGB
The nuts and bolts are "BA". I generally take out my ignition wrench set as the bolt heads and nuts often are different sizes. While there is usually a screwdriver slot in the bolts but I often prefer use of a hex wrench. I have, on occasion, swapped in knurled head bolts ofn the linkage or idle screws, or allen head.

In general, its trial and error.

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Re: Nut size
#8
ozieagle Avatar
ozieagle Gold Member Herb Adler
Geelong Victoria, Australia   AUS
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1958 Wolseley 1500 "Wooly"
1966 MG MGB "Bl**dy B"
1995 Toyota Highlander "Hi Ace Van"
2022 MG ZS
They are BA threads.

I find that metric are very close, IIRC those nuts are 8mm.

Herb


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Re: Nut size
#9
MGB567 Avatar
MGB567 Barrie Braxton
Ninderry, KabiKabi country, Queensland, Australia   AUS
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1966 MG MGB MkI "Money Guzzler"
1979 MG MGB GT V8 Conversion "Darkside"
8mm works for me but then mine are HS.

Just checked and assuming you're referring to the nut for the lost motion lever being clamped on main lever it's #AJD8102Z for both HS and HIF. Interestingly Google doesn't have a xreference for actual size nor does Leacy.


Mk1: CKD 11/66 first registered 8/5/67; owned since 3/77. 18GB +40 balanced. Peter Burgess BVFR head. Piper 285. 123. FidanzaFW. 4synch c/r box. Lots more as I did a nut and bolt rebuild; finished 2015. Tartan Red.

GT: December '78. VW Golf guards, flush fit front and rear valances. Torana XU1 vents, frenched indicators & Mk1 rear lights. 'Worked' Rover V8 with Monsoon ECU for EFI. GM4L60E, Lokar tiptronic & Quick4 controller. Vintage Air A/C. FC IFS. CCE 4 link rear. Salisbury with Quaife. Jaguar Storm.



Edited 1 time(s). Last edit at 2017-01-16 06:13 PM by MGB567.

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Re: Nut size
#10
barry s Avatar
barry s Barry Stoll
Alexandria, VA, USA   USA
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1972 MG MGB GT
1974 MG MGB
1976 Triumph TR6
1980 MG MGB
Just to be clear. The fasteners are "BA". The head and nut sizes are "BA". This is no different than SAE or Metric. That said, other than BA wrenches may fit the bolt heads and nuts. This is why I use my ignition wrench set which has about a dozen open end wrenches between about 1/4" and 1/2" not all of which are 'regular' sizes.

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Re: Nut size
#11
ddubois Avatar
ddubois Dave DuBois (RIP)
Bremerton, WA, USA   USA
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Barry S is correct - the fasteners on MGB Carbs are BS. Moss used to carry a set of "ignition" wrenches in the BA size.
Cheers,


Dave DuBois
1953 MGTD
1966 MGB
http://homepages.donobi.net/sufuelpumps/

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Re: Nut size/small sockets are the easiest IMO eye rolling smiley
#12
Donthuis Avatar
Donthuis Don van Riet
Rijswijk, ZH, Netherlands   NLD
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1972 MG MGB MkIII
I use a small 8mm hex socket myself. Spannering is hardly possible in the restricted space around them.
It comes in a boxed set with a 1/4" extension and ratchet, no need to go to my socket sets in 1/2" & 3/8" (much too large for this application)

In reply to # 3431818 by dipstick If referring to the in between carbs linkage, 5/16" six-point or 8mm six-point. Just checked on the '71 HS4. It is 21*F in the garage.cool smiley



Edited 1 time(s). Last edit at 2017-01-17 03:45 AM by Donthuis.

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Re: Nut size
#13
Be Coming Avatar
Be Coming Kelvin Dodd
So. Calif., USA   USA
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1957 MG MGA
1957 MG MGA Coupe
1958 MG Magnette
1958 MG Magnette ZB    & more
Moss carries a BA wrench set for these:

http://www.mossmotors.com/Shop/ViewProducts.aspx?PlateIndexID=31189

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Re: Nut size
#14
tvrgeek Silver Member Scott S
Hillsborough, North Carolinia, USA   USA
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1973 Triumph Stag
8 was too small, SAE a bit big, at least with my sets. Newer round lobe may fit easier. Looks like a good case for some #10. Not going to buy a entire BS set for a couple of nuts.


Cogito ergo sum periculoso

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Re: Nut size
#15
dipstick Avatar
dipstick Kenny Snyder (RIP)
La Center, WA, USA   USA
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1941 Ford N-Series
1958 MG MGA 1500 Coupe "Rosie"
1970 MG MGB GT "Pat's GT"
1971 MG MGB "Gifted To Me"    & more
"8 was too small, SAE a bit big, at least with my sets".

Not all sockets and nuts are created equal, like buying a size-10 shoe on the internet. Some of the nuts have sharp ridges on the corners, and some have ripples on the flats. The vendors may have changed thru the production run.


Be safe out there.
Kenny

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