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EGT Problem

 
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frank3phyl(at)comcast.net
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PostPosted: Fri Oct 22, 2010 5:55 am    Post subject: EGT Problem Reply with quote

I have a ROTAX 912S with GRT EIS model 2000. #3 EGT reading suddenly became erratic--going from very low reading to normal with all sorts of readings in between within a second or two. Now I'm getting a steady 25 degree C reading. Fastening to exhaust is secure & haven't checked other connections, yet. Question: what happens when the EGT thermocouple goes bad? Is this likely my problem or more likely a loose connection in wiring? Other three EGT readings are good.
Thanks
Frank
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longg(at)pjm.com
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PostPosted: Fri Oct 22, 2010 7:01 am    Post subject: EGT Problem Reply with quote

Frank,
 
This happened to me recently when I was in there fixing something unrelated and simply bent the wire back. I got all kinds of wacky readings. A simple disturbance like bending the wire can affect the reading dramatically. They don’t go bad that easily.
 
Glenn E. Long

 
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of frank3phyl(at)comcast.net
Sent: Friday, October 22, 2010 9:51 AM
To: aeroelectric-list(at)matronics.com
Subject: AeroElectric-List: EGT Problem


 
I have a ROTAX 912S with GRT EIS model 2000.  #3 EGT reading suddenly became erratic--going from very low reading to normal with all sorts of readings in between within a second or two.  Now I'm getting a steady 25 degree C reading.  Fastening to exhaust is secure & haven't checked other connections, yet.  Question:  what happens when the EGT thermocouple goes bad?  Is this likely my problem or more likely a loose connection in wiring?  Other three EGT readings are good.
Thanks
Frank
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BobsV35B(at)aol.com
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PostPosted: Fri Oct 22, 2010 7:24 am    Post subject: EGT Problem Reply with quote

Good Morning Frank and Glenn,

The most common problem with probe reading is because the wires to the probe are loose. You are supposed to place the toothed washer between the two ring terminals, not under the nut or screw, and it must be tightened thoroughly.

I would check that fastener for proper application and maybe install a new washer just in case.

The current flowing through that connection is very small and it needs to be clean and tight.

Happy Skies,

Old Bob

In a message dated 10/22/2010 10:02:36 A.M. Central Daylight Time, longg(at)pjm.com writes:
Quote:

Frank,

This happened to me recently when I was in there fixing something unrelated and simply bent the wire back. I got all kinds of wacky readings. A simple disturbance like bending the wire can affect the reading dramatically. They don’t go bad that easily.

Glenn E. Long


From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of frank3phyl(at)comcast.net
Sent: Friday, October 22, 2010 9:51 AM
To: aeroelectric-list(at)matronics.com
Subject: EGT Problem



I have a ROTAX 912S with GRT EIS model 2000. #3 EGT reading suddenly became erratic--going from very low reading to normal with all sorts of readings in between within a second or two. Now I'm getting a steady 25 degree C reading. Fastening to exhaust is secure & haven't checked other connections, yet. Question: what happens when the EGT thermocouple goes bad? Is this likely my problem or more likely a loose connection in wiring? Other three EGT readings are good.
Thanks
Frank
Quote:
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