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MG TD TF 1500 - Head Stud Thread Size

Once my head is freshened I am going to install new studs and I want to chase the threads in the block. Can someone please tell me the thread size in the block so I can order the proper tap? I am in North Dakota and don't have any of my resource material with me. Thanks in advance.
A. R. Todd

Contact Tom Lange. I just replaced my head studs with high quality studs I purchased from him.

Web Site
http://bluefirestudios.org/MGTrepair/Index.html

e-mail
tlange@acadia.net

I also replaced the head nuts and push rods. All from Tom
Mort 1950 TD Möbius

AR - The head stud treads are 1.5mm For a complete list of the XPAG/XPEG fastener size and threads, see the chart, Fasteners for XPAG/XPAE Engines in the Other Tech Articles section of my web site at: http://homepages.donobi.net/sufuelpumps/ Cheers - Dave
David DuBois

I would be very, very careful about using a standard tap to clean out the threads in these high-stress holes. You will be removing metal that is crucial to maintaining strength there. You need a clean-out tap, which does not have the sharp cutting edges; I make mine by sandblasting a standard tap until it has lost all it's sharp edges (sounds brutal, I know - but it then only removes the dirt, not the metal).

And yes, I do have high-quality head studs available. See my webpage at mgtrepair.net

Tom Lange
Bar Harbor, Maine
t lange

Mort and all - my web page is now mgtrepair.net

Tom Lange
Bar Harbor, Maine
t lange

What Dave DuBois is saying is that the thread pitch is 1.5 mm. The stud diameter is 10 mm. That fasteners list of Dave's is worth its weight in gold. Bud
Bud Krueger

I mailed my check to Tom Lange on Thursday for new studs, nuts and freeze plugs. I just want to be sure that my threads are clean before installing the new studs.

Thanks guys for the replies!
A. R. Todd

A.R. Todd
Can you contact me via e-mail?
Mort
Mort 1950 TD Möbius

Mate

If you dont want to go to the expense of purchasing a tap and still have a head stud in good condition you can practice an old Aussie backyard fitter trick.

Place the good head stud in a vice holding it by the hex head, using a hacksaw cut a series of longitudinal 0.020 inch cuts thru the threaded section.

The cuts act as a medium to trap any unwanted matter when the stud is screwed into the block. Ensure you clean out the cuts with a wire brush after each cleaning operation.

Often this practice will even recover damaged female threads when the correct thread tap is not to hand.
G Evans

I second Tom's practice of abrasive blasting any new tap that is going to be used to chase threads. This is particularly critical if trying to clean threads in aluminum. I learned the hard way not to use a new tap to chase the threads in an aluminum pump housing on a customer's fuel pump. Quicker that it takes to write this, I ripped the threads right out of the pump body. Fortunately I had some very good, used bodies to use as a replacement. Cheers - Dave
David DuBois

All - Reading Dave DuBois' post reminds me that it was actually HE who suggested the abraisive-blasting technique to me. I have used it successfully, and take this opportunity to thank him again for all his many contributions to the MG world.

Tom Lange
bar Harbor, Maine
t lange

This thread was discussed between 22/10/2011 and 23/10/2011

MG TD TF 1500 index

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