Egt probe install mess up

[ColoradoColt]

So I installed a egt sensor when I got my adrenaline however long ago it was. Alls been fine up until last week. I noticed it was defueling very often with lots of throttle and I was hitting my 1200 egt limit very fast. I checked the fittings and the one that goes directly into the manifold is loose and I can hear a whistle. I’m worried to go any tighter because it would be at the very top of the threads and I’m worried it would make it too big to even hold the fitting at that point.  Is there any other type of fitting I can use that’s a size up but will still fit the adrenaline egt probe? 

Edited December 18, 2020 by ColoradoColt

[NIsaacs]

Can you take a picture of the fitting and thermocouple? Is it this type?

 

https://www.genosgarage.com/product/isspro-658sht/isspro-gauge-accessories

 

If so, the fitting should be 1/8" NPT and should snug up with a turn or two.

[Tractorman]

The one in the in the link is 1/4" pipe thread, but still the same concept.  It should be a tapered thread and it should snug up if the tapped hole hasn't been enlarged.

 

- John

[ColoradoColt]

Here’s my exact one. I know when I installed it, it snugged up and everything was fine. Now I tightened it all the way and it still rattles. When I start the truck I can feel hot air coming out so it’s leaking.

[NIsaacs]

I think Isspro will have the larger adapter fitting. You would need to drill it out and tap the next size, 1/4" if yours is 1/8". I doubt a pipe plug will seal either so that is out. If it would, you could drill another small hole for the adapter fitting you have. Pipe thread is tapered so you have to be careful and not go too deep with the tap. The deeper you go the bigger the threads. Fixing the hole you have with a larger one might be best so you don't drill another one.

[Irie808]

How about some high temp JB Weld on the threads and around the top edge?