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MG MGA - oil/water gauge thermocouple thread size

Got a question regarding the tapped hole size in the 1500 MGA head for the water temperature thermocouple. I want to plug the hole and send the gauge out for repairs. While repair is being done I'm going to buy dual gauges (water & oil temp) so I can keep on driving.. Hopefully is not a BSF thread.. I think its a straight thread not tappered.. This is my everyday driver so need to drive the 20 miles to town to buy new gauges. thanks Mike
mike

Hi Mike

The thread is common in all 'A' and 'B' series engines, an electrical temp sensor from a Mini or MGB will suffice

Terry
Terry Drinkwater

It is not a thermocouple but a capiliary temp, I am pretty certain the thread is 3/8 BSP parallel. Not 100% certain it is 3/8ths but am absolutely sure it is a BSP parallel thread.
Bob (robert)

Mike - The good news is that the thread is not BSF. The bad news is that it is 3/8 BSP. BSP threads are parallel threads unless otherwise indicated. If you cannot find a plug or another, unused threaded collar for the temperature sensor bulb, e-mail me and I'll go through my junk ans see if I have one somewhere. I also have a 3/8 BSP die and can modify a standard American pipe plug to fit. Cheers - Dave
David DuBois

Mike,
I was able to find a lot of BSP fittings at a local hydraulics supply shop. You might check your phone book and call around a little. I have also seen at some auto supply stores, expanding rubber plugs for oil pan drain holes that might work for a temporary plug.

Jeff
Jeff Schultz

Japanese cars use the same thread on temp senders. Nissan and Mazda I know because I used a MG temp gauge on a Rx7 engine. Belies their british heritage.
R J Brown

This thread was discussed on 06/09/2005

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