Eddie 70

iTrader: (3)

I have been looking but have not came across the correct adapter just yet. I need a little guidance guys. Where to find?

I want to put my stock 1970 Temp sensor in the rear hole in the passengers head. The stock thread pitch is 1/2 X 14 NPT.

Any help on how to get this temp sensor in the head without drilling and tapping is greatly appreciated.

Thanks,
Eddie

LS1MCSS

iTrader: (18)

If it's 1/2", you may not find one that's big enough. I hate to say it, but it's time to get out the drill and tap.

Pop N Wood

iTrader: (1)

There is a heater plug in the block just below the head temp sensor. You can drill that out and tap it for a sender.

Don't think there is a way to get a half inch sensor in that little metric head hole.

69Project

Do a search on here, I saw a thread where a guy drilled out an existing sensor and inserted the one going to the original guage. I think he did this for his 1st Gen Camaro. It might be in one of the permanent stickies....

ls1nova71

iTrader: (4)

I believe that was for an oil pressure sender, don't think that will work to get a temp sender from a 70's car in it, the sender is just too big. Like others have said, your probably going to have to drill and tap. It's not that difficult, providing you can get to it. Might be a little tough if the engine is already in the car though. Anyway, a little grease on the drill and tap will keep the metal shavings from falling into the coolant passages.

veee8

iTrader: (40)

I made the mistake of running a manual temp gauge, Autometer, which is a similar sending unit, big probe. I ended up with $45 worth of adapters, that put the probe about 4-5 inches from the head. Certainly not the ideal setup. It showed 20*-30* different than the electric sensor for the BS3. It was terribly ugly too. I ditched that for a full sweep electric gauge. I got all the adapters at a local industrial hyd. supplier. Way too much work and money for results in my application.

SMAX

iTrader: (11)

Yep, you're gonna have to drill it and tap it.

bczee

iTrader: (12)

Suggest you work with the local part store guy to find out what ohm reading your factor sender is and see about finding a smaller (1/4" or 3/8" NPT thread) sender that can work with your factory gauge. Once you find one, you can either get the adapter or drill and tap the head.
Even if you were to drill and tap the pasenger side head for your 1/2" sender... The Sender will be very close to the Exhaust Manifold and may not give you enough room to thread the sender in. I am not even sure that once you drill and tap, that there will be enough of the head left to be safe (too thin of a water jacket need to the exhaust port or threaded part of the head to be safe).

ssvolvo

The thread you are working with is 14 mm X 1.5mm pitch. This is a straight thread, not NPT (national pipe thread which is tapered). I cut my sending unit down in a lathe and re-tapped 14X1.5....Works great. Any machine shop should be able to do this for you. If you have an old sending unit similar to the one you will be using just cut it apart with a hacksaw and see if you have enough meat to do this.

Andy1

I think you may be able to find a sender to correctly match the ohm range needed for your gauge. e-gauges.com lists several that perhaps may work. If you can match one up that has a 1/8 NPT thread, then adapter forthe 12x1.5 thread in the head are available from them as well. It would greatly simplify the task.

Andy1

jomomma

iTrader: (39)

s&p and jegs has sender adapters.

Eddie 70

iTrader: (3)

Are you sure it is 14X1.5? I have read on here and some folks are saying 12X1.5. I just want to be positive before I go to the trouble of cutting threads. I like your idea best and bought a new sending unit today, $6, and will try to get it cut down tomorrow IF I am sure what the thread size it.

Pop N Wood

iTrader: (1)

It is 12x1.5

Here is a pic of a sender adapted to the block heater plug. The block plug was drilled out and tapped with a 1.2-14 NPT. The other adapters are to fit a Datsun sensor.

G-Body

iTrader: (4)

The sender is 12mm x 1.5. I think your sender might be the same as the one for my El Camino as it was 1/2" NPT. And I cut it down in a lathe and rethreaded it. You could probably just spin it in a drill and use a file to cut it down. There should be a couple pics on my fquick account of the rethreaded sensor.

Eddie 70

iTrader: (3)

12X1.5 it is.


Thanks G-body. I see how you did yours, now I just need to see if I can get one of my machinist buddies to do the same for me.

Shawn MacAnanny

iTrader: (12)

The temp sensor for our engines is M12x1.5 autometer sells and adapter for that to 1/8" NPT ATM PN 2277 and any parts store can order it. I am not sure about getting it to half inch though. See about your gauges and I'm sure you cna fine an 1/8" sender for it.

G-Body

iTrader: (4)

I had my uncle cut my sender down in a lathe since he has one a work, but in reality I think I could have just chucked it in a drill and cut it down with a file being that its only brass.

LS1MCSS

iTrader: (18)

I have tried doing things like that before and in the long run, it's much easier to just have it cut down in a lathe.

Eddie 70

iTrader: (3)

Okay, it took two tries to get it cut down but I have it cut down and it should work, I hope.

Here is my turned down version.

G-Body

iTrader: (4)

That looks good , better than mine turned out. Just don`t forget to put a sealing washer on it (the metric threads are straight cut unlike NPT threads) so they need a washer (usually aluminum) to seal it.