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MG TD TF 1500 - Fuel Tank End Panel T Nut

I found the PO stripped one of the T nuts on the side of the fuel tank that the side panels bolt onto. Too far out to rethread.

These are round T nuts that have 1/4 BSF threads. I have not found any at the suppliers.

I asked Doug at FTFU. He says he has not found any but gave a good recommendation. Weld a 1/4 nut onto a round washer and then weld the washer onto the tank.

I was thinking I can grind off the threaded part of the T nut, leaving the circle and then weld a nut right to it. That will get the alignment correct.

I was also thinking I could fill it with braze and then retap it. The problem there is it is pretty short and I don't have a BSF flat tap.

Bruce Cunha

Bruce -

This is the only 1/4" BSF tee nut that I have found. It has a thin base and prongs to secure it into wood. Only available in packs of ten with screws. Might be able to be adapted and brazed to your tank(?)
https://www.mgbits.com/contents/en-uk/p9685_T-Nut-_-Screw-1_4-Whitworth-(Pack-of-10).html
(gotta copy-paste the link)

Unfortunately, this 1/4 inch tee nut is no longer available at NTG or at a Jag supplier.
https://www.mgbits.com/contents/en-uk/p3823_T-Nut-Round-1_4-BSF.html

Here are all British thread tee nuts at NTG:
https://www.mgbits.com/contents/en-uk/search.php?searchphrase=t-nut

I added silver solder to a 1/4-20 tee nut, then tried to tap it for 1/4" BSF for use in wood (no brazing heat). No luck. Maybe there is another way to accomplish it.

Lonnie
TF7211
LM Cook

I found the PO stripped one of the T nuts on the side of the fuel tank that the side panels bolt onto. Too far out to rethread.

These are round T nuts that have 1/4 BSF threads. I have not found any at the suppliers.

I asked Doug at FTFU. He says he has not found any but gave a good recommendation. Weld a 1/4 nut onto a round washer and then weld the washer onto the tank.

I was thinking I can grind off the threaded part of the T nut, leaving the circle and then weld a nut right to it. That will get the alignment correct.

I was also thinking I could fill it with braze and then retap it. The problem there is it is pretty short and I don't have a BSF flat tap.

Bruce Cunha

Bruce -

This is the only 1/4" BSF tee nut that I have found. It has a thin base and prongs to secure it into wood. Only available in packs of ten with screws. Might be able to be adapted and brazed to your tank(?)
https://www.mgbits.com/contents/en-uk/p9685_T-Nut-_-Screw-1_4-Whitworth-(Pack-of-10).html
(gotta copy-paste the link)

Unfortunately, this 1/4 inch tee nut is no longer available at NTG or at a Jag supplier.
https://www.mgbits.com/contents/en-uk/p3823_T-Nut-Round-1_4-BSF.html

Here are all British thread tee nuts at NTG:
https://www.mgbits.com/contents/en-uk/search.php?searchphrase=t-nut

I added silver solder to a 1/4-20 tee nut, then tried to tap it for 1/4" BSF for use in wood (no brazing heat). No luck. Maybe there is another way to accomplish it.

Lonnie
TF7211
LM Cook

Bruce-
-If you're going to weld on your tank, don't forget the danger involved---Maybe take it to a radiator repair joint and pay for it to be welded and live to enjoy it-
Could you drill it out and fit a nutsert in the hole -A 6mm x 1mm pitch nutsert would go very close and measures-
6x1 met = .236" x 25.4 tpi
1/4" bsf= .250" x 26 tpi

I'd take a 1/4"bsf bolt down to your local bolt shop and try it in a 6x1 nutsert

OR
You could get a 6x1 flange nut or T nut and run the thread through to 1/4" bsf and weld that on the tank

willy



William Revit

Bruce, Loctite has an epoxy that has a shear strength of over 1900 lbs, I forget the number but it's available wherever Loctite is sold or on line. It might be to your advantage to check it out. PJ
PJ Jennings

Thanks All.

Lonnie, MGbits was the one place I was going to look. I will drop them a note as I have done a lot of business with them.

Their floorboard kits are IMHO, the best out there.

As for welding on the tank. It has been without fuel in it for 2+ years. I will also fill it with CO2 prior to doing any welding. An easy way to do this is to put in a piece of dry ice and let it sit until you see it coming out the filler.

I am also thinking I may just lathe a T nut out on my lathe.
Bruce Cunha

One of my Tee bolts is home made on a lathe. A large dia thinned head, it is bonded on with JB Weld, and has been there for 20 years.
J Stone

Cheers Bruce
2 1/2 years is just long enough to make you feel safe and you'll get away with it, but borderline-I see you know about dry ice, there are other methods as well but there was no way on the planet that I would suggest one on here for someone to shortcut and blow themselves away with--By the sound of it you've got it under control---

Silver solder is magic for fuel tank fittings

willy
William Revit

This thread was discussed between 01/04/2020 and 03/04/2020

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