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MG TD TF 1500 - O ring instead of Cork?

I put the new Moss O rings on the carb choke shafts instead of cork. They seem to drag and not letting the shafts return all the way to close. Their as loose as I dare. Can't increase the spring pressures as it will be very hard to pull the chokes on. Should I redo them and use the cork instead? PJ

PS, I even lubed the shafts to see if that helped, it didn't!
Paul S Jennings

What about adding some silicone lube?
Christopher Couper

Paul,
I have a hydraulics business with thousands of o-rings, and I tried them in the carbs.

There are applications where cork and leather are superior to the lastest seal materials. This is one of those times where I'd select the cork.
JRN JIM

Paul -

I fought changing the cork gaskets and glands to modern materials. I finally replaced them with Teflon and Viton December last year. No leaks since. And the jets move up and down easily. Don't know if it helped -- I polished the jets with Brasso so that the Teflon O-rings would perhaps slide easier. I bought the O-rings from a local supply house.

O-rings sizes have a "dash" in front of the number, so they are called "dash numbers." These O-rings replaced the glands and jet sealing washers in the SU H-4 carbs on my TF-1500.

> JET SEALING WASHER: "-210" Viton O-rings @ $0.75 each, walk-in retail price. One O-ring per carb. (Two required for two carbs)

> GLANDS: "-010" Teflon O-rings @ $0.49 each, walk-in retail price. Two O-rings are required to replace each cork gland ... two Teflon at the top and two at the bottom. (Four required for one carb. Eight required for two carbs.)

I bought from
Sterling Seal and Supply
541 Johns Rd,
Apopka, FL
Branches in other US cities
$15.00 minimum order

Round off the sharp edges around the holes through the side of the jets so that they do not cut the Teflon O-rings when you install them.

Here is info about installing O-rings by Tom Bryant. Some people disagree with some of his rebuild methods, but most accept that his info on O-rings.
http://thosbryant.wordpress.com/2014/03/01/su-carburetor-rebuild-h-4/

Lonnie
TF7211
LM Cook

Paul, I fought lousy cork seals of various types since the early 70s. They all leaked after a couple years, choke was hard to pull, etc. I switched to Tom Bryan's Teflon 0-rings in 2007 and have not had a leak since. The choke pulls incredibly easy. "Their as loose as I dare"? What is loose? The big nut has to be cinched up tightly. What color are the Moss O-rings? George
George Butz

I have the Moss O-rings (the color is black) and they work just fine with no leaks. Maybe polishing with Brasso is worth a try.

Joe
Joe Olson

I fixed a TD with a bad carb leak at a GOF a few years ago. The leaking jet packings were rubber o rings, but I have no idea who the vendor was. I have never used the Teflon o rings, but I have heard good things.
David
D. Sander

Just installed Tom Bryant's kit of 8 Teflon orings and 2fat Viton (?) orings in my TF SU's and have no leaks and good choke activation/return. Thanks for the phone advice , Tom.
I had tried to install the rebuild kit with cork seals (the Moss/SU rebuild kit) but had gas weeping problems. On dis-assembly, I found the new cork seals and brass washers in bad shape. All were soaked in oil for 24 hours as recommended. I doubt if I could do better on a second attempt with the cork stuff but I'm fairly confident I could do another successful rebuild with the Teflon/Viton oring kit.
T W Moore

PJ - Contact Tome Bryant at: thosbryant@gmail.com and get a set of 8 teflon 'O' Rings (two each, top and bottom). They will fix your problem. Cheers - Dave
D.W. DuBois

I just substituted the cork with Viton O rings and they work perfectly.
Dave H
Dave Hill

Just sent Tom Bryant an email. Thanks guys! PJ
Paul S Jennings

Ordered Toms O rings. Man I hate to pull those carbs again, especially with the side panels in place. PJ
Paul S Jennings

How do the "O" rings hold up to the current gasoline with ethanol?

thanks,
Bill
TD24570
Bill Brown

Don't know Bill, but I'm assuming their ok as being Teflon. I'm putting them in there when they come and hope they hold up! PJ
Paul S Jennings

Viton is fine.
Dave H
Dave Hill

This thread was discussed between 03/05/2015 and 04/05/2015

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