Morris Minor Owners Club

Hi all,

I want to install a temperature gauge in the usual position in the head near the thermostat - BUT - can anyone advise what the thread size this hole is tapped with? I have a VDO gauge with NPT thread sender, so need the appropriate adapter.

Alternatively, can anyone advise the appropriate sender name/number/source vehicle that would fit straight in?

The various places I've been to so far are all shaking their heads and going cross-eyed. Their best guess was 3/8 BSF, but that barely starts in the thread.

I tried removing one in one of my other cars to crosscheck but the threaded section of the adaptor sheared off in the head, so now I need to source another one as well..... AArrggghhh!

Michael
Western Australia

I 'think' it is a BSP thread.

I think it's BSP too-could very well be 3/8". The one I installed was Intermotor (Nottingham)Temperature transmitter Part no 5271 which I bought on fleabay.
Hope it helps.
Regards
Declan

18 TPI, just measured it , if that helps

Hi guys,
Thanks for your responses!
To answer my own question, for others with the same problem, it turns out that the head is threaded 5/8 UNF, not BSP as suggested.

As most aftermarket gauges these days, like my VDO, use 1/8 NPT thread senders, you need a 5/8 UNF male to 1/8NPT female adapter - if you know what you're asking for, they are easy to find!

For example, a quick Google throws up many, this is just one example in the UK: http://www.speedycables.com/threadadaptors.html

I actually got one from this mob in Australia - fantastic service, overnight delivery to the opposite side of Australia : http://classicmotoring.net.au/cmos/inde ... b01f083a09

Got it, and installation took just seconds, and it's all working beautifully. BTW, because this is a parallel thread rather than a tapered pipe thread, you will need an O-ring, fibre washer or carefully applied PTFE tape under the head of the adaptor (NOT in the threads though) to properly seal the adaptor to the head.

Hope this helps others.

Cheers,
Michael, Western Australia