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  #1  
Old 10-14-2019, 10:28 PM
pilotyoung pilotyoung is offline
 
Join Date: Jan 2018
Location: Birmingham, AL
Posts: 244
Default CHT

On the way home from Petit Jean on Sunday, the right side CHT was going all over the place,up and down, sometimes staying steady, most of the time up and down.

My thoughts are that either the sensor is bad or there is a wiring problem. Has anyone else had this problem? Anyone have any insights as to which it is?

I had a great time at Petit Jean so thanks to all the people who put it on.

Thanks.
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John D. Young, RV-12 Owner
Serial Number 120022, N6812Y
Bought it as a flying airplane in Feb. 2018
Just passed 300 hours flight time in RV-12, and 10,000 hours mostly in corporate jets. I am a CFI; CFII; MEI; and a Advanced Ground Instructor, CFIG; and hoping to be able to help new RV-12 owners by doing some transition training for new builders and owners in RV-12's.
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  #2  
Old 10-14-2019, 10:38 PM
DHeal DHeal is offline
 
Join Date: Sep 2006
Location: Windsor, California
Posts: 983
Default

First and easiest thing to do is to wiggle / clean the CHT spade where it connects to the cylinder head probe -- as I recall the probe is located under the right rear cylinder head.. Sometimes corrosion builds up at this point and a cleaned connection sets things right. You can also check the wiring and connection for continuity. Sounds like a simple poor connection at the probe to me.
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David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 (circa 1965) - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B 2020) - N124DH flying since March 2014 - 1,050+ hours (as of July 2021)!
VAF donation through June 2022.
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  #3  
Old 10-15-2019, 02:37 AM
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Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,465
Default

Do troubleshooting per above post. Symptoms you describe are typical EGT failure mode. Correct PN is EGT, Hose Clamp, 0.75-1.25", Rotax SKU: #100405-001. Can purchase direct from Dynon for $36.
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 685

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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  #4  
Old 10-15-2019, 05:44 AM
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jeffkersey jeffkersey is offline
 
Join Date: Sep 2015
Location: Cottontown, TN
Posts: 302
Default Yes..

I had that happen. I would unplug and clean the connectors, and it would be good for a bit and then do it again. Out of frustration, I cut the connectors off and soldered the wires together. Has not happened since doing that.... knock on wood....
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  #5  
Old 10-15-2019, 09:16 AM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,566
Default

A friend of mine had used successfully the wooden stiffener wrapped with wetted fiberglass cloth but had waxed the gear leg so the fiberglass does not adhere to it and allow it to flex as it needs. He was very happy with the results.
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N825SM RV7A - IO360M1B - SOLD
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  #6  
Old 10-15-2019, 01:33 PM
Jamesey Jamesey is offline
 
Join Date: Feb 2008
Location: Hartlepool, England
Posts: 195
Default Question

Quote:
Originally Posted by Bavafa View Post
A friend of mine had used successfully the wooden stiffener wrapped with wetted fiberglass cloth but had waxed the gear leg so the fiberglass does not adhere to it and allow it to flex as it needs. He was very happy with the results.
May just be me but I cannot fathom what this has to do with CHT connections.
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  #7  
Old 10-15-2019, 01:42 PM
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Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,465
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The wooden stiffener wrapped with wetted fiberglass cloth is used to wax the gear leg and EGT probe.

The wax melts off the probe at first engine start and you might get a little paraffin whiff in the cabin...
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 685

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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  #8  
Old 10-15-2019, 03:48 PM
DennisRhodes DennisRhodes is offline
 
Join Date: Jul 2007
Location: Taylorsville, Ga
Posts: 862
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I thought I knew what a gear leg stiffener , CHT and EGT was , but . That' s why I like VAF , You can learn something new everyday!
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RV9 N908DR
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  #9  
Old 10-20-2019, 09:42 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,103
Default

I love my D180/D100 combo, but in 7 years and almost 1000 hours I?ve gone through 3 EGT probes, 1 oil pressure probe, and an 1 EMS card. Seems like a lot considering I?ve put 3000 hours on my Cherokee 180 in 33 years and never had any engine sensor or display failure.
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