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MG TD TF 1500 - Oil drain plug thread - need help

Hi folks, I found a clever Idea for future oil change jobs.
It is a draine valve, which has to be installed instead of the normal plug.
The function is as follow. You remove the cap and install the hose connector. In that case the valve will be opened automatically and the oil will go thoug the hose in you collection tank.,x-a.htm

My point now is who can help to give me the right thread spec for my MG-TD #29639

Thank you


That's very clever Guenter, but I assume it is for fluids that have no solid matter in them. A minute piece of carbon or metal shaving would jam the valve open and run the risk of emptying the sump.

Also, I have a magnetic sump plug, and almost always have something stuck to when when I change oils.

Although it seems quite plausible, I think I'll stick with what I have.

Gord Clark
Rockburn, Qué.

Gordon A. Clark

Guenter -- I made up a drain plug in Stainless steel to replace one that the hex was gone on. The threads into the sump are 0.815" OD 14 TPI Right hand. The threaded portion is 0.460" long and the distance from the flange is 0.512inches. These dimensions turn out to be 1/2" BSP pipe (straight).

Any more dimensions needed?


R. K. Jeffers


I agree with Gordon - not worth it for a once or twice a year oil change. Thread is a British Standard Pipe Thread, commonly used in plumbing fittings - see Archives for details of exact size.

Cheers, John.
J C Mitchell

Folks, you can find XPAG fastener information, along with a chart of standard threads and other fastener information in the Other Tech Articles section of my web site at: Bob and John are correct, the sump drain plug is a 1/2 - 14 BSP.

Guenter - I doubt very seriously that you will find on of those sump drain valves in the above thread. If you are set on having one of those, you can get one for the MGB (they are available) and drill/tap the existing drain plug for 1/4 BSP and thread it into that. The reason I know that they are available for the MGB is that I got one. I soon abandoned it though, because it is a very small opening (probably 1/8 - 1/4 inch) and are extremely slow draining. I think I waited for about half the oil to drain out of our MGB, when I finally unscrewed the thing and tossed it to the back of my work bench and went back to the standard drain plug - I was not impressed. Cheers - Dave
David DuBois

Thank you guys for your comments and advises.
The Valve is available in 12" BSP and it should have a larger opening as Dave described in his experience.
However, this unit is not too expensive and I will try it. I should come back later with my experiences.

This thread was discussed between 08/11/2008 and 09/11/2008

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