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MG TD TF 1500 - Air Intake Manifold Bolt

Hello,

While doing some cleaning and upkeep I removed the air intake manifold from my 51 MG TD. Upon going to reinstall I noticed that one of the bolts is missing and I can't find it anywhere. I checked Moss Motors and see they have a Carb to Air Cleaner Bolt (320-625) but this looks like the bolt comes through and screws into the manifold. My bolts are fixed into the manifold somehow and there are nuts tightening the manifold to the carbs. Help please identifying the correct part I need, picture attached.

Thanks,

Steve

SD Denham

Steve

Something is not standard on your manifold, see this link;

www.angloparts.com/en/catalogues/group/769/mgtd-tf-cylinder-head-accessories?page=3#img1

Item 57 is listed as quantity 4, no mention of studs being used in this area.

Graeme
G Evans

Mine has bolts. I like the idea of the studs with a nut to install.
Mine take about 5 min per bolt because of the limited space.
M Grogan

Those bolts are supposed to be 5/16 X 3/4 BSF. For a complete list of fasteners used on the XPAG engines, see the Chart Fasteners for XPAG/XPEG Engines in the Other Tech Articles on my at: http://homepages.donobi.net/sufuelpumps/ Cheers - Dave
DW DuBois

I thought they were 1.0x8mm?? George
George Butz

That's because the bolt doesn't go directly into the engine. The 'pipe to air cleaner' attaches to the carburetors. Otherwise it would be 8x1. At least that's how I see it. Bud
Bud Krueger

Take another look at Dave's chart. It says 8x1.0mm for TD, the BSF for Mk IIs and TFs. I'm positive several TDs I have worked on had 8/1.0 bolts, including my own. George

George Butz

You're right, George. Air Cleaner Elbow to Carburetor - 8-1mm x 7/8. I just accepted Dave's posting and rationalized it. Mea culpa.

5/16 and 8mm are awfully close to being the same diameter. I'll bet that it would be very easy to force the wrong thread into the aluminum of the air cleaner. Must go and see what bolts I have in Lazarus. Bud
Bud Krueger

Hi DW, is the stud 328-810 on your chart what I need? I looked it up on Moss and it looks like what is attached to the engine head, not the air intake manifold to the carbs.

Steve
SD Denham

You should have bolts there, not studs. The manifold is already wrong with the studs you have, so who knows what thread it is?

Go to your local hardware store and see if an 8x1.0 bolt screws in tightly - then either use metric 7/8" long bolts, or order the correct ones from Abingdon Spares or Moss. If not, figure out the existing thread from the studs you have, and get bolts the right dimensions.

Tom Lange
MGT Repair
t lange

Once more I find myself confronting the group:

The aluminium pipe to air cleaner: Part # X 24277, which was on TD3191, was secured by four, 5/16"-22 x 3/4" BSF bolts. However; one bolt had damaged threads which had affected the internal threading of one of the blind holes.

I rethreaded the holes to 5/16"-24 UNF and used 3/4" S/S units as the replacements. The threading of the damaged hole was recovered sufficiently enough, by the process, to lock its corresponding bolt.

Not original I know, but in my early days of trying to locate bits I was facing a new science. So, I took what I felt was the easiest way out. Worked for me !

Cheers then; respectfully:
Jack Emdall, Halfmoon Bay, B.C., Canada

Jack Emdall

Tom, so what you're recommending is to just remove the remaining three studs and replace all with bolts, yes? I kind of wish I could stick with the studs with nuts, but it looks like finding a replacement stud is going to be difficult. Thanks all for your input!

Steve
SD Denham

Why not make one. Obviously it is necessary to establish what the thread is - perhaps by trying one of the nuts on bolts with different threads. Then buy a short length of studding, or a bolt or set screw (full thread bolt) with enough thread, and then file the correct size hexagon. It should be feasible to do this as the hexagon looks smaller than the thread core size - it might also be necessary to cut to length. The originals look plated, which may not be possible, but you might need another nut.
(I hate to suggest this, but you could check that the lost item is not in a carburettor or in the engine).
R A WILSON

Regarding BSF Studs:

British Tools & Fasteners,(sales@britishfasteners.com) Page # 37 of the current parts catalogue list 5/16" BSF studs starting at 1-1/4 inches and up to 3 inches in length.

They also supply a variety of 1/4" and 3/8" BSF studs.

emdall: TC6768/TD3191
Jack Emdall

It depends what you want out of your car. To correctly fix correctly as original, remove the studs, re-tap to whatever thread you think correct (8x1.0mm I still think correct for early TD) or use helicoils and 4 proper bolts. If you want to repair and drive the car, either figure out what thread is existing and fix as suggested above, or tap/thread and use whatever. IMHO, always better to fix correctly in the long run. George
George Butz

Brown and Gammons, a UK T type parts supplier at www.ukmgparts.com, show them as 8mm x 25mm bolts, part number MET8125. The pitch is not mentioned, but it has to be 1mm. However, whoever fitted the studs may have used different threads.
R A WILSON

Excellent idea those studs. It makes it a whole lot easier to take the manifold on and off which needs to be done every time the carbs are tuned.
Hugh Pite
H.D. Pite

This thread was discussed between 17/01/2017 and 20/01/2017

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