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Thread Pitches for Sensors


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#1 Coke

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Posted 19 June 2011 - 12:55 AM

I'm trying to get to the bottom of what the thread pitch is for the sensors in the intake manifold.

Professor Quest says:


http://starquest.i-x...opic.php?t=1097


The coolant temperature sensor, EGR thermovalve, and radiator fan switches, are 3/8'' NPT.

Komeuppance says it is M16x1.5


Which is it?


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#2 slowquest

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Posted 19 June 2011 - 01:03 AM

You should've made this a poll....

My vote is 16x1.5

#3 87TsiOwner

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Posted 19 June 2011 - 01:47 AM

It could be either... only way to find out for sure is to run a die over the sensor.
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#4 ucw458

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Posted 19 June 2011 - 02:05 AM

Well it's not M16x1.5 on my thread pitch gauge.  It's also not quite 3/8 NPT.  Only goes in 2 threads before binding on a 3/8 NPT hole.  You could force it into a 3/8 NPT hole using teflon tape to make it seal.

My vote is 3/8 british pipe thread since all the other stuff is british pipe thread.

Edited by ucw458, 19 June 2011 - 02:06 AM.

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#5 Komeuppance

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Posted 19 June 2011 - 02:05 AM

LOL... you quoted that all wrong, but alright.

The radiator fan sensors are M16x1.5mm.

Quote

Bi-Metal Type, Radiator Fan
Switch M16 * 1.5 Metric
Thread Normally open
Closes @ 189 to 199゚F
Opens @ 3 to 10゚F below
closing temp.
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#6 ucw458

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Posted 19 June 2011 - 02:08 AM

View PostKomeuppance, on 19 June 2011 - 02:05 AM, said:

LOL... you quoted that all wrong, but alright.

The radiator fan sensors are M16x1.5mm.


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Just tested that.  Correct.
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#7 Komeuppance

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Posted 19 June 2011 - 02:14 AM

If you have one out will you test the thermovalve??

I know the CTS is a different thread than the thermovalve and fan sensor.

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#8 ucw458

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Posted 19 June 2011 - 02:52 AM

View PostKomeuppance, on 19 June 2011 - 02:14 AM, said:

If you have one out will you test the thermovalve??

I know the CTS is a different thread than the thermovalve and fan sensor.

-Robert


Will do

Thermovalve threads match the CTS threads.  I believe they are both 3/8 british pipe thread.  Though they will both fit a 3/8 NPT hole... sortof, A BTPT hole is the proper thread.

BTPT  Industry standard for "British Taper Pipe Thread"



A 3/8 NPT tap is very close but doesn't quite line up with the threads properly.  Further proof is I have a new unused 3/8 NPT brass T here and both sensors only go in about 2 threads before binding.  A 3/8 NPT fitting goes 3-4 threads into that T before snugging up.

Edited by ucw458, 19 June 2011 - 02:57 AM.

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#9 Komeuppance

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Posted 19 June 2011 - 03:05 AM

Most interesting.  The fan sensor fits in the thermovalve opening, but the CTS doesn't fit in the radiator.

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#10 quest1988

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Posted 19 June 2011 - 03:07 AM

why dont you just pull out the sensor and check the thread pitch on the sensor. or i can do it on monday. have extras

#11 Metric-man

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Posted 19 June 2011 - 09:59 AM

PQ wrote

Quote

"And after you chase the threads a little deeper........YOU'LL say they are American pipe threads"
I think he means the internal threads are soft and a NPT tap works fine

I would use a metric thread pitch gauge, first on the sensor threads then on the internal aluminum threads, and to achieve a good seal
I would also use teflon thread sealant.
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Edited by Metric-man, 19 June 2011 - 10:21 AM.

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#12 Chad

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Posted 19 June 2011 - 11:29 AM

http://starquest.i-x...ht=thread pitch

Long entertaining read, with pictures and correct thread pitch gages used. in the end PQ admited he was wrong the whole time, but refuses to post correct info because apparently it would make him look worse to admit I was right, than to post bad info :wacko:


the entire car is BSPT pipe threads, except for one fitting on the intake for the automatic bost/vac port, and that is a dry seal NPT (NPTF).
  
The factory temp gage is not pipe thread, it's 16x1.5, the CTS is 3/8 BSPT.

You can convert any of the BSPT threads to NPT with a tap, but it's a one way street, there is no going back.  Also, if you try to cram a BSPT sensor or fitting into a NPT hole, you will be lucky if it is seals, and will ruin the threads ,but it will usualy work OK if you use a lot of thread sealant (the paste style, not the tape).

#13 ucw458

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Posted 19 June 2011 - 03:21 PM

View PostChad, on 19 June 2011 - 11:29 AM, said:

http://starquest.i-x...ht=thread pitch

Long entertaining read, with pictures and correct thread pitch gages used. in the end PQ admited he was wrong the whole time, but refuses to post correct info because apparently it would make him look worse to admit I was right, than to post bad info :wacko:


WOW.... just wow  :rolleyes:
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#14 Komeuppance

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Posted 19 June 2011 - 04:37 PM

LMAO... five pages... really...

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#15 ColdScrip

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Posted 19 June 2011 - 05:01 PM

View PostChad, on 19 June 2011 - 11:29 AM, said:

http://starquest.i-x...ht=thread pitch

Long entertaining read, with pictures and correct thread pitch gages used. in the end PQ admited he was wrong the whole time, but refuses to post correct info because apparently it would make him look worse to admit I was right, than to post bad info :wacko:


the entire car is BSPT pipe threads, except for one fitting on the intake for the automatic bost/vac port, and that is a dry seal NPT (NPTF).
  
The factory temp gage is not pipe thread, it's 16x1.5, the CTS is 3/8 BSPT.

You can convert any of the BSPT threads to NPT with a tap, but it's a one way street, there is no going back.  Also, if you try to cram a BSPT sensor or fitting into a NPT hole, you will be lucky if it is seals, and will ruin the threads ,but it will usualy work OK if you use a lot of thread sealant (the paste style, not the tape).


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#16 kev

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Posted 13 January 2016 - 07:20 AM

Found this old post on a search.  Some good info worth moving to the FAQ section.

Take a look at how similar, yet so different, BSPT pipe threads are to NPT.  Some of the sizes have the same size and pitch but the thread has a different angle.

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