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MG TD TF 1500 - TF1500 Radiator Cap

Hi gang!

I was checking the radiator today and noted the old (10 years)radiator cap had corroded away somewhat (inside metal flange). I had gotten it from NAPA as I recall, but there is no part number on it. Nonetheless, I saw a thread from some years ago on the topic, that referenced a NAPA P/N of 7031410. It's rated at 4 Lbs. Was planning on getting one in the next few days as they have one in stock. I checked the MOSS catalog, and they list one there as well. Any suggestions on which one may be a better fit on the TF? Also, Moss lists what appears to be an alternate 7 Lbs. cap. While only 3 Lbs. different, does it make a difference and if so...how? Is it intended for perhaps colder climates or some other reason?

The car seems to run fine using the 4 Lbs. NAPA cap. Any reason to get one from MOSS?

Cheers!

Jim
Jim Rice

A higher pressure cap will elevate the boiling temp slightly, which can be an advantage for a higher ambient temp, but it sounds like you don't need it. The cap is a fairly standard push and turn type that looks like many others, but its deeper/taller than most - this is easy to get wrong. If you get it from Moss it should be right.
Dave H
Dave Hill

Measurements for a TF cap. PJ


Paul161

Thanks gentlemen,

Between the explanation and measurement, should be able to secure the proper cap.

Best regards,

Jim Rice
Jim Rice

The height is the important one, as there is a short one & a tall one. Stant brand is the best on the market, either 4# or 7# but no higher.
Len Fanelli

Keep in mind that a higher pressure cap puts more pressure on core plugs that were originally designed for an unpressurized engine. If its running fine at 4 psi I would stay with that.
Jack Long

I must have got the short one, because it needs about a 3mm rubber washer to seal properly. I thought it was just my car being difficult - I must try to pick up a long one.

David
DavePro

Well...I elected to get the 4 lb. one from Moss. I asked where they got them, and they said a source in England.....of course we don't know where they get them from! We'll see!

Cheers,

Jim
Jim Rice

This thread was discussed between 23/05/2016 and 24/05/2016

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