I have an original 1930's Boyce Motmeter which I would like to be able to use on my M-type but the nut which goes under the radiator cap is missing and a long internet search seems to indicate the brass nut is a very obscure American thread described as- "7/16 27 NS 2B " and I cannot find a supplier. Apparently the modern reproductions are not the same.
This is the Junior Motometer in question (below).
And this is what the nut looks like -
It seems suppliers tend to offer replacement nuts for the modern reproductions, the postage is prohibitive and they do not fit the original.
Can anyone suggest a supplier? And am I quoting the correct thread?
I have the same problem. You are right about the thread pitch as I measured it with a thread gauge as between 26 and 28 tpi. As a temporary solution I bodged up a wooden nut, using the motometer thread as a tap. It worked fine during 250 miles of the Kurnow Wheals. However if anyone can make these nuts I would be very interested. John
you must have caught me at a good time. I was just doing some lathe work making centre pins for my leaf springs so figured I'd give you a nice surprise to wake up to
Oh yes. I forgot to say Sam that postage won't be prohibitive. As long as it stays under 10mm thick it is less than a couple of pounds. I know from bitter experience how some want to charge a fortune for international postage (and for us in NZ just about everything is international postage!) I refuse to join their way of thinking as a matter of principle.
I found the ad below on eBay and I have placed an order for a Junior thermometer. I believe replacement Motormeter thermometers have not been available for years.
Are Motormeters British or American? The reason I ask is that if they are British the thread would probably be what is known as a Brass thread, all of which are 26 TPI, very close to the UNS 27.
MotoMeters are American. They came out well before the British 'equivalent' and they seem to be made of a much better alloy. The examples below are both from the early 1930's but the Wilmot Breeden instrument is not aging well.
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Posted - 28/11/2017 : 21:49:34
