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Old 07-24-2012, 07:28 PM   #1
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Default 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?
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Old 07-24-2012, 07:37 PM   #2
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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.
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Old 07-24-2012, 07:38 PM   #3
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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.
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Old 07-28-2012, 12:10 AM   #4
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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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Old 07-28-2012, 03:09 AM   #5
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Contact LS1MCSS, i just got a temp sending unit lathed down to the proper thread specs and his pricing and shipping was great!!
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Old 07-28-2012, 06:03 AM   #6
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I tapped the head to a size of one of the adapters that came with my mechanical guage.
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Old 07-28-2012, 07:20 AM   #7
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I doubt you can turn down 1/2" to fit in the head. The drivers side brass block plug is the perfect size to drill the interior (allen head) and tap for 1/2" npt.
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Old 07-28-2012, 11:50 PM   #8
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i tap'd my waterpump for my old camaro and truck and it work'd like a charm....
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Old 07-29-2012, 05:53 AM   #9
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Quote:
Originally Posted by garys 68 View Post
I doubt you can turn down 1/2" to fit in the head. The drivers side brass block plug is the perfect size to drill the interior (allen head) and tap for 1/2" npt.
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.
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Old 07-29-2012, 10:57 AM   #10
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Quote:
Originally Posted by LS1MCSS View Post
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.
How much for a sender?
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Old 07-29-2012, 10:57 AM
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12mmx15, 12npt, 12x15mm, 38, adapter, block, lq4, ls1, ls1tech, npt, plug, sende, sender, temp, thread, turn


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