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lgold(at)quantum-associat
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 Posted: Sat Jul 19, 2008 5:58 pm Post subject: Erratic CHT reading on Rotax 912 |
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The forward left CHT value jumps all over the map on my Dynon 180 EMS and generally reads lower than the right sensor. I replaced the CHT thermocouple sensor on my Rotax 912S engine (80-hours TT) , and checked the wire connections but the problem persists.
Has anyone resolved a similar problem on their Rotax 912?
Les
(PS: the CHT sensor is really pricy and I was not happy that the problem did not go away after buying it.)
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craig(at)craigandjean.com
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| Posted: Sat Jul 19, 2008 9:49 pm Post subject: Erratic CHT reading on Rotax 912 |
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If you swap the wires between the left and right sensors does the problem follow the sensor or the wires?
Did you install them “dry” (no Teflon tape or thread sealer). Since they ground through the threads you shouldn’t use anything on the threads. Same with the oil temperature and pressure senders.
BTW: they are not thermocouples. They are resistors whose value varies inversely with temperature. As far as I know they are just off-the-shelf automotive oil temperature senders (possibly from VDO). According to a chart in the Rotax installation manual (page 128, section 21.1 of Edition 1, rev 0, May 2007) the resistance at 20 C is 1000 ohms and 15 ohms at 160 C
-- Craig
From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of Les Goldner
Sent: Saturday, July 19, 2008 7:56 PM
To: rotaxengines-list(at)matronics.com
Subject: Erratic CHT reading on Rotax 912
The forward left CHT value jumps all over the map on my Dynon 180 EMS and generally reads lower than the right sensor. I replaced the CHT thermocouple sensor on my Rotax 912S engine (80-hours TT) , and checked the wire connections but the problem persists.
Has anyone resolved a similar problem on their Rotax 912?
Les
(PS: the CHT sensor is really pricy and I was not happy that the problem did not go away after buying it.)
| Quote: | | http://www.matronics.com/Navigator?RotaxEngines-List |
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craig(at)craigandjean.com
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| Posted: Sat Jul 19, 2008 10:06 pm Post subject: Erratic CHT reading on Rotax 912 |
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Correction: the “heavy maintenance” manual says for the cylinder head temperature sensors “On assembly, tighten the temperature sensor to 10 Nm (90 in. lb). Secure screws with LOCTITE 221.” Presumably the Loctite doesn’t interfere with the ground.
The manual says to use Loctite 243 for the oil temperature and pressure sensors (section 79, 3.1.4).
-- Craig
From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of Les Goldner
Sent: Saturday, July 19, 2008 7:56 PM
To: rotaxengines-list(at)matronics.com
Subject: Erratic CHT reading on Rotax 912
The forward left CHT value jumps all over the map on my Dynon 180 EMS and generally reads lower than the right sensor. I replaced the CHT thermocouple sensor on my Rotax 912S engine (80-hours TT) , and checked the wire connections but the problem persists.
Has anyone resolved a similar problem on their Rotax 912?
Les
(PS: the CHT sensor is really pricy and I was not happy that the problem did not go away after buying it.)
| Quote: | | http://www.matronics.com/Navigator?RotaxEngines-List |
0123456789
[quote][b]
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Sun Jul 20, 2008 9:49 am Post subject: Re: Erratic CHT reading on Rotax 912 |
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Hi IGold,
I had this issue with my EGT's on my Dynon D-100. I put new EGT probes in, but that didn't help. What made the difference was reloading the current program software. Is everything else fairly steady.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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lgold(at)quantum-associat
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| Posted: Sun Jul 20, 2008 12:21 pm Post subject: Erratic CHT reading on Rotax 912 |
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Thanks for the advice Craig and Roger.
I did install the unit correctly and will switch wires per your advice Craig's, if Roger's suggestion to about reloading the Dynon software doesn't work.
Les
[quote] From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of Craig Payne
Sent: Saturday, July 19, 2008 11:04 PM
To: rotaxengines-list(at)matronics.com
Subject: RE: RotaxEngines-List: Erratic CHT reading on Rotax 912
Correction: the “heavy maintenance” manual says for the cylinder head temperature sensors “On assembly, tighten the temperature sensor to 10 Nm (90 in. lb). Secure screws with LOCTITE 221.” Presumably the Loctite doesn’t interfere with the ground.
The manual says to use Loctite 243 for the oil temperature and pressure sensors (section 79, 3.1.4).
-- Craig
From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of Les Goldner
Sent: Saturday, July 19, 2008 7:56 PM
To: rotaxengines-list(at)matronics.com
Subject: Erratic CHT reading on Rotax 912
The forward left CHT value jumps all over the map on my Dynon 180 EMS and generally reads lower than the right sensor. I replaced the CHT thermocouple sensor on my Rotax 912S engine (80-hours TT) , and checked the wire connections but the problem persists.
Has anyone resolved a similar problem on their Rotax 912?
Les
(PS: the CHT sensor is really pricy and I was not happy that the problem did not go away after buying it.)
| Quote: | | http://www.matronics.com/Navigator?RotaxEngines-List |
0123456789
0[b]
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