Temp sender re-thread
Temp sender re-thread I've read that it is common to cut down a stock sbc temp sender to fit the 12X1.5 threaded hole in the head. The sender I have is 1/2 npt and is quite a bit larger than the 12 mm hole. Can I safely remove that much material from the sender without messing anything up? And for my own understanding....what is inside the temp sender?.....How does it work?
I tried turning down an M14x1.5 sender to fit and it ripped in half when I tried to tighten it. Hard to imagine getting a half incher down to that size.
There is just a small electronic thermister, a hard piece of plastic with two electric leads, inside the hollow brass tube.
In fact, I have had a stock one twist in two with just slightly too much torque.
Your best option is to drill out the head and retap it or relocate it to a different spot. Lots of options for that.
There is just a small electronic thermister, a hard piece of plastic with two electric leads, inside the hollow brass tube.
In fact, I have had a stock one twist in two with just slightly too much torque.
Your best option is to drill out the head and retap it or relocate it to a different spot. Lots of options for that.
Teching In
Joined: Feb 2011
Posts: 45
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From: Sydney Australia
I re-taped my head ti 1/2" NPT without any problems.
The temp sender has a small thermocouple inside it who's resitance varies with the temp of the water surounding it.
There aren't any moving parts inside.
The temp sender has a small thermocouple inside it who's resitance varies with the temp of the water surounding it.
There aren't any moving parts inside.
Looking through the local salvage yard, I see that some of the 90's gm vehicles have a 3/8 npt sender. Could this be cut down and threaded to 12X1.5? I'd rather modify a sender than the head.
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You are correct. The 1/2" senders won't turn down small enough. I tried an old one I had here and cut completly through it way before it was small enough. I start out with the 3/8 senders and cut them to 12MM.
