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MG TD TF 1500 - TD carburetor leak

I have a gas leak under the aft SU carb which is wetting the choke linkage when I return from a drive. My guess it's the cork gland for the needle jet tube. Before I go yanking the carbs off to replace it, can the jet tube assembly be dropped out with the carburetor in place?
Mike
TD15250
Mike I

Yes. Disconnect the linkage.
W A Chasser

And remember to soak the cork gaskets in oil for a day before installation.

Tom Lange
MGT Repair
t lange

Yes, Tom, you're correct... that's critically important. I actually heat the oil first so that I get better penetration into the cork as the oil cools overnight.
Kevin McLemore

... and measure the depth of the jet before disassembly. After sealing be careful while centering the jets for the needle. Lift the piston before screwing in the jet assembly and block it with a piece of carton. The piston with the needle should sink down completly after that.
W_Mueller

Suggest reading archives as there are volumes in there about this and things to watch out for. I'm a fan of the Teflon O-rings. George
George Butz

I feel that it's easier to remove the carbs to replace the sealing washers and glands. Maybe that's because I have a TF and the side panels block easy access to just about everything on the engine!!

I agree with George. Teflon O-rings stopped leaks in my SUs. Click this link to download info on replacing cork glands and sealing washers with O-rings. When the document opens, click the "download" icon ... a downward pointing arrow with a bar across the tip in the upper right corner of the screen.

http://drive.google.com/file/d/0BxisXBEpc-IWeXFOQzZZQnNScFk/view?usp=sharing

Lonnie
TF7211


LM Cook

Thanks Lonnie,
I have exactly the same problem as Mike on my TD and I will replace with Teflon this winter.

Bill TD24570
Bill Brown

Lonnie pointed out big difference: remove carbs on a TF, no need on a TD. George
George Butz

I tried the Teflon seals on my carbs, and Viton seals before that, but neither worked, and they both seemed a rather loose fit. Initially I went back to cork, but was not happy with those either. In the end I bought the Super Seals from Burlen and that was the solution that worked best. I assume is that in some cases, through wear or manufacturing, the bore of the carb is just a little too large for the Teflon seals to work well. Then the Burlen seals are then the only solution that I know of.
Dave H
Dave Hill

Thanks for all your comments and inputs guys. I really appreciate them. I forgot about centering the needle. I guess at the very least I'll have to remove the intake manifold.
Dave, I was surprised to hear the teflon seals were loose. I know the cork seals are compressed by a tapered surface to queeze them to fit the contour of the bore and jet OD, but I guess the teflon is a little too stiff to conform the same way. I haven't researched the Burlen seals yet. What are the made of??
Mike
Mike I

I was surprised as well, but they were of the size specified and you are right they are fairly stiff material. Before anyone asks, yes I did use two in each position.
Burlen don't say what theirs are made from - all I know is they work well. You can't just swop the seals though, as you need the full kit with some brass parts as well. I think its worth trying Teflon as they are inexpensive and if they work then job done, if not then get the Burlen kit.
Dave H
Dave Hill

This thread was discussed on 15/11/2017

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