Coolant temperature sensor: thread size and pitch?

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hermeticist
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Coolant temperature sensor: thread size and pitch?

Post by hermeticist » Fri Mar 29, 2019 10:34 pm

I think my thread is damaged on the coolant temperature sensor hole (For the temperature gauge). Does anyone know the correct pitch and thread size (online sources state m12 x 1.25, which is clearly rubbish...)?

It looks like 15mm but that seems a bit of an odd size...

Thanks!



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Coolant temperature sensor: thread size and pitch?

Post by Oaksey » Fri Mar 29, 2019 10:48 pm

Buy one from the suppliers. They're a special resistance IIRC and most make the gauge read wrong


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Coolant temperature sensor: thread size and pitch?

Post by hermeticist » Fri Mar 29, 2019 10:51 pm

I bought a new sensor from QRG, it's the hole it goes in that is being naughty... :)



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Coolant temperature sensor: thread size and pitch?

Post by hermeticist » Fri Mar 29, 2019 10:53 pm

I was going to try a quick recut of the threads...



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Coolant temperature sensor: thread size and pitch?

Post by philhoward » Sat Mar 30, 2019 5:36 am

1/8”NPT?


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Coolant temperature sensor: thread size and pitch?

Post by scimjim » Sat Mar 30, 2019 7:58 am

This is a Ti IIRC?

Are you sure you’re looking at the gauge sensor and not one of the other two coolant temp sensors? 15mm sounds more like one of the others.


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Coolant temperature sensor: thread size and pitch?

Post by hermeticist » Sat Mar 30, 2019 1:36 pm

Yes Jim, sorry 1800ti. I re-measured the sensor (definitely gauge: single wire) this morning, and it's approximately 16 x 1.5 (max thread width of original part is 15.84 and new part is 15.76). Measuring the pitch, old part: 9.18mm divided by 6 threads = 1.53 New part: 8.83mm divided by 6 threads = 1.47

Shame I haven't got a thread measuring tool but that's the closest I can get. Last night I could have sworn it was 1.25..!

Unfortunately, the fastening shops in Plymouth are closed all weekend, so I'll have to wait :( I'll get a tap on Monday and clean it out...

Going back to what Josh said: I understood that I still needed to fit a resistor (difference between Nissan sensor and Austin Rover clocks)? But I was going to wait until I'd tested things...



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Coolant temperature sensor: thread size and pitch?

Post by scimjim » Sat Mar 30, 2019 2:18 pm

The one hidden under the stat? I’m amazed it’s 15mm. Anyway, standard Nissan part with the resistor added by Reliant.


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Coolant temperature sensor: thread size and pitch?

Post by peter freeman » Sat Mar 30, 2019 2:22 pm

33 ohm resistor is required if my memory is not playing tricks



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Coolant temperature sensor: thread size and pitch?

Post by hermeticist » Sat Mar 30, 2019 3:13 pm

Yes, I have a couple of the correct resistors, thank you Peter.

I know, it seems mad! It takes a 17mm socket to remove it:
15539587428698463594184298677722.jpg
15539587428698463594184298677722.jpg (143.03 KiB) Viewed 436 times



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Coolant temperature sensor: thread size and pitch?

Post by hermeticist » Tue Apr 02, 2019 10:16 pm

A quick follow up in case anyone else has an issue...

When removing or fitting, the easiest way (with coolant hoses in place) is to use a long 17mm socket. However, this means the socket (unless it has a very thin wall) is angled and can crossthread the housing and sensor. I always try and finger tighten things until it is definitely on the the threads but if the housing threads are already damaged then you may have an issue getting a tap in there.

I took the sensor into a local fittings supplier, who told me it was actually a bsp thread. So I went to a hydraulic supplier who sold me a blanking plug but in M16 fine (1.5 pitch), he said it wasn't bsp... Anyway, I then bought a machine screw and nut in M16 1.5 but this was too large to fit in straight, due to the tight confines of the sensor area. I used the blanking plug to clean up the threads (being alloy it is soft enough that, if used carefully, a steel thread will act as a cheap substitute for a tap if used VERY carefully - don't do this at home :) ).

I used the nut to clean up the sensor thread and all fitted well...

I hope this helps but don't beat me for not using the appropriate tap...



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Coolant temperature sensor: thread size and pitch?

Post by hermeticist » Tue Apr 02, 2019 10:17 pm

Oh, apparently there are also two different sensors for early and late engines (this is according to Nigel at QRG), so do check the thread!



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