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Thread Pitches for Sensors


Coke
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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.net/viewtopic.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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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
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LOL... you quoted that all wrong, but alright.

 

The radiator fan sensors are M16x1.5mm.

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.

Mitsubishi: MB007639

Wells: SW508

Standard: TS-144

 

-Robert

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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
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PQ wrote

"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.

http://www.ohiovalleyag.com/catalog/images/TruBlu.jpg

 

http://i1083.photobucket.com/albums/j382/Starion_Cult/threadpitchandsizeimportengine-2.jpg?t=1300990695

 

http://www.toolking.com/hanson-12016-16-leaf-metric-thread-pitch-gauge?c_j=1&URL=http%3A%2F%2Ftracking.searchmarketing.com%2Fclick.asp%3Faid%3D832058193&c_j=1

Edited by Metric-man
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http://starquest.i-x.net/viewtopic.php?t=3296&highlight=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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http://starquest.i-x.net/viewtopic.php?t=3296&highlight=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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http://starquest.i-x.net/viewtopic.php?t=3296&highlight=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).

 

 

You have got to be kidding me...

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