EGT Probe too long?

Hi all, I have an autometer egt gauge and probe, and the probe seems to be too long. I can't clamp the gauge on, so I was going to use their supplied thread fitting, and the probe is too long for the small runners of the exhaust manifold, any ideas?

[Turbodave]

The entire probe does not have to go inside the manifold, the tip is where the probe takes it's readings from. As long as it's centered in the manifold so the tip isn't touching the walls it should be fine.

that won't work, there is a threaded fitting that threads into the exhaust manifold, and you put the sender in there, on the other end of that fitting is another threaded side that a nut comes over the sender to thread onto the fitting in the exhaust manifold to hold it in place, so it almost has to go in most of the way...

[Turbodave]

I installed an autometer EGT in my shadow and sounds exactly like you are describing. I could sware that the fitting is just a compression fit that let's you mount anywhere on the round metal tube of the probe.

[4sfed4]

Quote:

Originally posted by ShelbyZTurboII that won't work, there is a threaded fitting that threads into the exhaust manifold, and you put the sender in there, on the other end of that fitting is another threaded side that a nut comes over the sender to thread onto the fitting in the exhaust manifold to hold it in place, so it almost has to go in most of the way...

I understand what are are explaining...Had the same problem myself.

What I did to solve it was found a copper ferrule (the kind used for compression fittings) that was just large enough to fit around the probe. This ferrule would then slide down the shaft until it hit the shoulder on the probe. The ferrule is not so long as to preclude the female threaded nut on the probe shaft from threading onto the male threaded end of the fitting that is installed into the manifold. This gave me the extra fraction of an inch needed to install the probe and have it not hit the bottom of the manifold. (If the probe touches the manifold, the readings will be much too cool.)

[4sfed4]

Quote:

Originally posted by Turbodave I installed an autometer EGT in my shadow and sounds exactly like you are describing. I could sware that the fitting is just a compression fit that let's you mount anywhere on the round metal tube of the probe.

Dave---Lots of the Autometer probes are like that with sliding compression ferrules. Unfortunately, there is one model (the cheapest one I believe) that isnt! And, it makes things a pain!

I cant remember the model off hand, but will try to find it tonight.

[Turbodave]

That could be the problem, mine came with the compression fittings and everything. Pretty sure mine is the 5244 model probe.

http://hp.autometer.com/products/acc...cessories.html

[4sfed4]

Quote:

Originally posted by Turbodave That could be the problem, mine came with the compression fittings and everything. Pretty sure mine is the 5244 model probe. http://hp.autometer.com/products/acc...cessories.html

Found it!

Here is the probe that I have (and what I believe ShelbyZTurboII to have).

Its the model 5249.

Yep, that's the exact sending unit I have. Any body have a part number or picture of the compression style unit? If it is interchangable w/ this sender, maybe I could just order one...

[The S is Silent]

I have that one too. Mine fits fine. I drilled the whole in the bottom of the exhaust maniflod to mount it, not the side. The ports are big enough for the probe if you do it that way.

Found a picture for the 5244 competition probe kit, but the mounting hardware does not look any different from what I have. Also, thinking about it now, that would have been the way to go, come up from the bottom, but I have a 1/8" NPT hole in the side of my exhaust manifold, so I'd like to do something with that if possible, otherwise I may just get a steel plug and plug it, try again from the bottom...

[The S is Silent]

lol...funny you should mention that. The first time I had it done, I took it into the machine shop with all the other crap I had to get done, and without thinking told him to put the hole in the top got it home and the probe wouldn't clear the intake runners.

I took it back and explained to him what happend. He laughed at me. Epoxied a plug in the hole and put a new one in the bottom.

And what have we learned from this experience. Plan out what we do before we do it.

[lametec]

Quote:

Originally posted by The S is Silent Epoxied a plug in the hole and put a new one in the bottom.

Did the plug fall out yet? Epoxy won't hold long on an exhaust manifold.

hehehe, you're telling me. I had everything completely apart and on a work bench (due to a blown headgasket) and I still managed to screw it up I guess I was originally planning on clamping it until I had my hole drilled and then I realized that the clamp wouldn't clear the intake runners... no problem I thought, I'll just use the thread fitting, and then I realized that using that fitting you have to have the probe almost at it's max length going in and unless the fitting is unscrewed almost to falling out of the manifold and the female nut that holds the sensor in is only hand tight, the tip hits the exhaust runner wall...

[4sfed4]

Quote:

Originally posted by ShelbyZTurboII Found a picture for the 5244 competition probe kit, but the mounting hardware does not look any different from what I have. Also, thinking about it now, that would have been the way to go, come up from the bottom, but I have a 1/8" NPT hole in the side of my exhaust manifold, so I'd like to do something with that if possible, otherwise I may just get a steel plug and plug it, try again from the bottom...

The 5244 is different as the depth of the probe can be varied. The compression fitting can go anywhere on the probe shaft and when you tighten it to the fitting in the manifold, it stays put.