TpCpLaYa

iTrader: (10)

OK well, there isn't much info on the forum that I found on the extra coolant temp sensor that automatic cars have. Hell, up to like a month ago I didn't even know what the hell the sensor was. Since I've owned my car the extra sensor had no wire to it and looked more like a plug than any type of sensor. I've talked to local FD owners and nobody ever seemed to know what the hell it was, as they all had 5 speeds.


Well, now I am doing major work and I wanted to eliminate the annoying coolant lines to the TB that spill all over anytime I need to remove the UIM. My problem is that I have my aftermarket water temp gauge in that line and I want to relocate it to where the extra auto sensor is currently at (I swapped to 5spd and it was never hooked up when I was auto). The trouble comes in because I'm not sure what threads are currently used with the auto sensor. Can somebody confirm what they are, I think they are metric or British standard pipe thread (maybe they are the same) but it's definitely not NPT because I just came back from ACE and the 3/8'' threads in like 2 turns and jams up....I don't want to damage the aluminum threads. The VDO temp sensor that I have is 1/4" NPT, so the 1/4" to 3/8" adapter I have won't work.

Question: Anyone know where I could get a 1/4" NPT to whatever the equivalent in metric/BSPT of 3/8" is.

BTW: I brought the stock auto sensor to ace and it threaded into a 3/8" NPT fine but was just a little loose so i think the size in metric/bspt is the equivalent to 3/8"NPT

I am trying to avoid tapping the housing so I don't have to remove it to clear out shavings

TpCpLaYa

iTrader: (10)

just more pics of the old setup and what I now need

badddrx7

iTrader: (7)

Think about taking a 3/8" NPT tap and tap the hole for 3/8". Run the tap down to the last 6 threads on the tap. Then thread your bushing in with a dab of pipe dope on it. Place some grease on the tap so it will catch your cuttings. This should work for you here, it's what I did.


Later

TpCpLaYa

iTrader: (10)

I'm kind of worried that shavings will inevitably fall into the housing when I thread the tap back out. That means I'll have to remove the housing to really clean it which is what I wanted to avoid. I mean I have no problem doing it, I just thought using the current threads would make everything a lot easier.

So nobody knows about pipe threads?

badddrx7

iTrader: (7)

If you are worried ( and you should not be using tapping skill ) then remove the neck. You are talking three bolts here and a hose.



Later

TpCpLaYa

iTrader: (10)

I know that, I'm just trying to educate myself in a different area....pipe thread!

Basically I just want to know if metric pipe thread and british pipe thread are the same and if they are what is used on the FD. I also would like to learn or see a chart of pipe thread conversions/equivalents between NPT and whatever is used on the FD.

MY car is basically down to the block minus the LIM and harness so I have no problem taking things apart, I would just like to learn a little bit about the situation I ran into.

TpCpLaYa

iTrader: (10)

....google has been helpful but it's hard finding an answer.

http://machinedesign.com/article/name-that-thread-1021 has some info but I'm still trying to figure out what threads are currently in the stock housing.

moconnor

iTrader: (14)

Many Japanese cars use British Standard Pipe thread (BSP) for sender fittings, which can be tapered (BSPT) or parallel (BSPP). 1/8, 1/4, etc. BSP is the same diameter as the equivalent NPT except that the threads per inch and thread characteristics are different. Tapping a BSP thread to NPT is pretty common and will work for the sort of pressures seen here (but is not a good idea for 1000+ psi systems).

BSP to NPT adapters are very common. Search on eBay or you can buy them from Pegasus racing.

Fallingdown

iTrader: (1)

Bringing back a old thread. Did any one ever figure out what threading it was?

SA3R

It is likely either:

'M" (Iso Metric) which is 60 degrees between thread shoulders.

OR

'Metric Taper' which again is also 60 degrees between thread shoulders.

I mention the 60 degree thing, because NPT is also a 60 degree thread- so an "M" or "Metric Taper" thread will actually feel like it threads into an NPT fitting, but it will be slightly loose as there are some minor differences in the lack of height of the thread form.

Both the threads I mentioned are widely used in Japan in industry, but they are uncommon/unheard of in Western countries.
I bet that's what it actually is.

tyxtox

This thread is probably dead but for anyone looking the part number for the stock sensor its N370-18-840. I havent found a reliable source stating the thread but ive found some stating its m12x1,5, not too sure though...

tyxtox

Thread is m16x1.5, removed the sensor today and maesured the threads. M16x1,5 100%