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MG TD TF 1500 - Carburretor Fixing Bolts.

My carbs are attached to the inlet manifold with studs and nuts. Whilst the bonnet sides are removed should I replace these with bolts to make dismantling easier in the future.

Jan T
J Targosz

Sure. Why not?

Also seems to me they might be easier to take off the carbs as you would only have to take out the bolts and lift them off versus trying to move them forward to clear the studs.

I just did this yesterday as I took my carbs off as a unit by undoing the supply line, choke linkage, disconnected the throttle and removed the bolt holding the overflow lines clip. The whole assembly with the air cleaner (not appropriate for the TF) came out in one hunk which I just set aside. I wanted to remove my exhaust header to get it re-aluminized.
Chris Couper

If memory serves me correctly, the TB, TC and TD's all used bolts to attach the carbs to the intake manifold, but the TF used studs.

Tom Lange
MGT Repair
t lange

Chris, I'd be leery of that change. You'd best be certain that the bolts that you use are of an appropriate length to tighten into the intake manifold without bottoming. I prefer the stud approach, IMHO. Bud
Bud Krueger

Tom. The TD parts manual and workshop manual shows bolts but perhaps the TF did use studs. The Abingdon catalog shows only studs and its kind of a compilation so it may be from a later BMC parts book that covered all the cars.

So Jan it appears your car may be as intended.
Chris Couper

Moss shows studs, A/S shows studs (OEM Part #AAA5773), the WSM shows studs (Page B.10), AKD834 shows studs (Plate F, #F47)). I have yet to see a document showing anything other than studs for the manifolds of a TD. Bud
Bud Krueger

One of my reasons for raising this topic is my TF was tuned by Mangoletsi and has one of their manifolds fitted. I think this is an original MG part that has been ported and polished. However I appear to have two spacers between the carb and manifold and the studs are quite long. I attach a photo.


Jan T

J Targosz

My TD service parts list shows only "bolt securing carburetter- 4-LA7153". Moss online shows TC/TD bolts and TF studs. It probably doesn't really matter as long as they are the correct length. George
George Butz

I have an unmolested TD and a similar TF in the shop right now, and the TD has bolts, the TF studs, which I am confident is the way they came - neither engine has been apart. TF's used a thick spacer to cut down on heat to the carb, and it seems as though Mangoletsi was concerned enough to double the gaskets to minimize heat. You may well have fuel boiling without both gaskets.

I don't think I would change anything, since a "tuned". engine is under higher stress, and presumably generates more heat doing it

By the way, how do you polish an intake? Porting is clear, but I've never needed to polish rough places. Interesting.

Tom Lange
MGT Repair
t lange

Bud: My two original workshop manuals (52 and 53) show bolts in the picture for section B10 (its on page B11). Interesting.

Tom: I think you nailed it. When they went to the spacers they probably went to studs for sure, maybe earlier too. I could certainly see the benefit of studs if you are going to be stacking parts instead of just one item to juggle and line up.
Chris Couper

We're talking about the fasteners that are holding the manifolds on, aren't we? The devices that hold the exhaust manifold clamps, no? There's no question that screws/bolts secure the carburetors to the intake manifold. Guess I'm befuddled by Jan's original wording. I can't imagine carburetors being held onto the manifold by studs. Bud
Bud Krueger

Bud - I think (hope...) the discussion is about the manifold/carb joint, at least that is what I have been addressing!

I stick to my position that TD and earlier cars have bolts holding the carbs to the intake manifold, while TF cars have studs mounting the carbs, with thick insulating washers.

Tom Lange
MGT Repair
t lange

Bud. As Tom points out we were talking about the carbs to the manifold, not the manifolds to the head.

You are right about the manifolds being held in place with studs on all cars.
Chris Couper

I'm currently fitting a 5 speed box to my TF and with the engine moved forwards slightly, room around the air filters is restricted. I am going to replace the carb packing pieces anyway with new ones since the ones currently fitted look suspiciously like asbestos.


Jan T

J Targosz

This thread was discussed between 21/04/2014 and 23/04/2014

MG TD TF 1500 index

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