Incorrect EGT Probe Install

[Cooker]

It seems I may have made a mistake (That's no big suprise to those of you that know me )



I think I tapped and installed my thermocouple too deep in the manifold. At the time I did it, I thought I knew what I was doing



I tapped all the way though the manifold and the bushing is installed flush with the top of the manifold. The bushing protrudes into the manifold about 1/4" and the thermocouple probably sticks out about 1" beyond that.



I have had no ill effects of this setup, should I be concerned about my error? What is the best way for me to correct this?



Thanks for the help,

Ryan

 

[EMDDIESEL]

What brand was it?. Regardless, it should not be that big a deal. Most important is that the Thermocouple does NOT bottom out on the bottom of the manifold. If it does and you dont know it, you may tighten the Thermocouple to the point that it bottoms out, then breaks and goes into your turbo. Stick something long and thin through the hole to use as a depth gauge and be sure you have the clearance (You should have plenty of room). The only disadvantage to the bushing being to far in the manifold is it may partially cover the Thermocouple and therefore may slow your readings down, but honestly, the difference would be undetectable. The other option you have is buy a threaded plug and plug the hole you drilled and tapped wrong, then drill and correctly tap the other manifold bank. But i think its un nessecary, you should be fine the way you are. Any small leak should clog itself up in a few days with carbon. Good luck

 

[illflem]

EMD is correct, as long as the thermocouple doesn't hit the opposite side of the manifold you are fine. It's not a good idea to move the t-couple after it has been crimped down, this can also lead to failure. As long as you feel that it isn't touching the bottom of the manifold you'll have no problem, leave it be.

 

[Cooker]

Thanks for the help fellas. I feel a little better now. When I first determined this I was so irritated with myself it almost ruined my whole day.



Bill,

I don't understand why it's bad to remove the thermocouple. It is just a compression fitting. I don't see how the accurancy of the probe could be affected by removal. I'm thinking I might try to shim out the bushing by installing a nut on it, and then reinstalling it in the manifold.



Thanks again,

-Ryan

 

[illflem]

Ryan, when you tighten down the retaining nut it actually smashes the t-couple a little bit. The way I understand it is the smashed down part becomes weaker and if put in the hot exhaust stream it can then break off. This would be more of a problem if you were attempting to put the probe in deeper than it was first installed.

 

[Shooter]

Another option would be to grind off the bottom of the fitting so it does not protrude into the ex flow as deep, but I dont think you will have a problem as is.