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Replacing an EGT Probe

 
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art(at)zemon.name
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PostPosted: Mon Jan 27, 2020 6:38 pm    Post subject: Replacing an EGT Probe Reply with quote

Folks,
I have one EGT probe which is intermittent and I want to replace it during my annual next month. It is an MGL probe, like this https://www.aircraftspruce.com/catalog/inpages/1105567.php
When I bought my engine, it came with a full set of probes and I kept the old ones. 
Should I install one of the old probes? Are they EGT probes the same? Or should I buy a new one? 
    -- Art Z.
--
https://CheerfulCurmudgeon.com/Love the stranger for you yourselves were strangers in Egypt. Deut. 10:19


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ceengland7(at)gmail.com
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PostPosted: Mon Jan 27, 2020 6:56 pm    Post subject: Replacing an EGT Probe Reply with quote

On 1/27/2020 8:34 PM, Art Zemon wrote:

Quote:
Folks,


I have one EGT probe which is intermittent and I want to replace it during my annual next month. It is an MGL probe, like this https://www.aircraftspruce.com/catalog/inpages/1105567.php


When I bought my engine, it came with a full set of probes and I kept the old ones. 


Should I install one of the old probes? Are they EGT probes the same? Or should I buy a new one? 


    -- Art Z.


--
https://CheerfulCurmudgeon.com/ Love the stranger for you yourselves were strangers in Egypt. Deut. 10:19















Both are likely type K probes. Next question is, grounded or ungrounded. The replacement should match the original.


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nuckolls.bob(at)aeroelect
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PostPosted: Mon Jan 27, 2020 7:12 pm    Post subject: Replacing an EGT Probe Reply with quote

At 08:34 PM 1/27/2020, you wrote:
Quote:
Folks,

I have one EGT probe which is intermittent and I want to replace it during my annual next month. It is an MGL probe, like this https://www.aircraftspruce.com/catalog/inpages/1105567.php

When I bought my engine, it came with a full set of probes and I kept the old ones.Â

Should I install one of the old probes? Are they EGT probes the same? Or should I buy a new one?Â

EGT probes are generally type-K wire
and operationally robust . . . if they
work at all . . . they're probably
okay. Besides, you're not using it
to hit a target temperature . . . just
so many "clicks below peak."

So try an old one . . . it just might
save you some bux.



Bob . . .


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nuckolls.bob(at)aeroelect
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PostPosted: Mon Jan 27, 2020 7:18 pm    Post subject: Replacing an EGT Probe Reply with quote

Quote:
Both are likely type K probes. Next question is,
grounded or ungrounded. The replacement should match the original.

Charlie brings up an excellent point. If your
EGT instrument is a stand-alone steam-gage,
it probably doesn't care. But if a modern
digitally processed device, it might make
a difference. Something to consider if your
experimental replacement from the junk-box
is wonky. Cheap, low risk experiment.



Bob . . .


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cluros(at)gmail.com
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PostPosted: Mon Jan 27, 2020 7:44 pm    Post subject: Replacing an EGT Probe Reply with quote

Is it the probe or the connector?

Art in my experience there is no difference in functionality between different brand probes. Garmin, Dynon, Electronics International, they all respond and read the same. The difference lies in the longevity of the probes and quality of the connectors. If you already have probes that came with the engine (and if you had 4 probes it was for some sort of engine monitor so they are probably the correct types) old or not I would use them until they fail. No sense spending money on something that will work the same as what you already have.
I often cut the connectors off and use these instead:
https://www.aircraftspruce.ca/catalog/inpages/eioverlapolc-1-10-05470.php  

On Mon, Jan 27, 2020 at 7:25 PM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:

Quote:
Quote:
Both are likely type K probes. Next question is,
grounded or ungrounded. The replacement should match the original.

 Charlie brings up an excellent point. If your
 EGT instrument is a stand-alone steam-gage,
 it probably doesn't care. But if a modern
 digitally processed device, it might make
 a difference. Something to consider if your
 experimental replacement from the junk-box
 is wonky. Cheap, low risk experiment.



  Bob . . .


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art(at)zemon.name
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PostPosted: Tue Jan 28, 2020 7:47 pm    Post subject: Replacing an EGT Probe Reply with quote

Thanks, folks. I'll try one of the old EGT probes and see if it works.
Cheers,
    -- Art Z.

--
https://CheerfulCurmudgeon.com/Love the stranger for you yourselves were strangers in Egypt. Deut. 10:19


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