JB Weld won't do....
 

Ok, i had an aftermarket sensor located in the in water filler neck, just above the coolant level sensor. i seemed to be getting some bad reading and decided to move it down and to the right of the sensor. well i tapped it out, and 1/8 pipe thread, but it is too fucking loose? HTF did that happen, same tap. i am guessing a little to big of hole.

anyway you can use teflon tape, or JB weld on it becuase the probe needs to ground properly. So the is their a JB weld like expoxy that is electrical conductive?

Ideas. Why does this shit always happen...

I would see if there is a TimeSert (IMHO, a better Helicoil) that will fit and give you back the original threaded hold.

Otherwise try some aluminum brazing filler like A-LUM-RITE or DuraFix, dependent if you can get some heat/flame in there without damaging other components.

Good luck.

:-) neil

The jb stick weld putty is metallic and should be conductive.

this may sound stupid, but run a tiny little ground wire to it?

Actually that is what i was thinking. Wondering if you can soder to aluminium?

like m104-amg says get a heilcoil and do it the right way.:icon_tup:

is it NPT thread, you probably tapped it too deep, get an adapter for the next largest NPT tap and try again.

As he said, is there room for a 1/4 NPT threaded hole? If so, drill and tap it out to that size (make sure you don't tap too deep - that's what happened on the one that's too loose) and get a 1/4 to 1/8 NPT reducer bushing to make it fit.

Dave

not sure if there is a enough room... have to get a tap and see. BTW where do you fine a 1/4 to 1/8 NTP adapter?

Good place to find TimeSert / helicoil? seems like Napa/Kragen don't ever seem to have them. do you have to buy a set of them?

Ok, ill ask the moron question

what drill bit do you use for the 1/8 NPT tap? there was a comment that i may have tapped too deep? how do you know how deep to tap it then?

IIRC, the tap drill for a 1/8 NPT is 17/64. Pipe fittings are tapered. And, all pipe fittings are NOT created equal. You have to tap a bit, then try the fitting to make sure it will start to thread in. Just beyond the point where it begins to thread in is the correct depth to tap. The thinner the material you're tapping into the more critical this is.

Any Home Depot, etc., will have the 1/8 to 1/4 adapter bushing.