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CHT reading failure

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rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Wed Apr 09, 2014 10:55 am Post subject: CHT reading failure

The 912S sat out the winter months while we worked through the gig list from the aircraft's annual. The only change to the engine was replacing an O-ring on the coolant inlet of the number 4 head.On startup last Sunday, the engine started and ran fine however the MGL EFIS would not show CHT readings. I've verified that the wires from the senders to the RDAX unit are connected, but the day closed out before I could get any further. It seems unlikely that both senders would fail at once but I would still like to verify that they're working properly. Does anyone have or know of a resistance chart for Rotax CHT senders?

 



Thanks,

Rick Girard



It isn't necessary to have relatives in Kansas City in order to be unhappy.

   - Groucho Marx

 



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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Wed Apr 09, 2014 11:44 am Post subject: Re: CHT reading failure

Hi rick,



I can almost guarantee it isn't the two separate CHT senders that went bad at the same time and these senders are fairly bullet proof and tend to last many years. Somewhere there is a bad connection.  Most Rotax fixes are simple and people always want to start looking for exotic problems. Start simple first.



A bad connection.

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Last edited by Roger Lee on Thu Apr 10, 2014 10:07 am; edited 2 times in total

h&jeuropa

Joined: 07 Nov 2006
Posts: 635

Posted: Thu Apr 10, 2014 3:42 am Post subject: Re: CHT reading failure

Rick,



Here is a VDO chart of temp sensors.



Jim Butcher

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TemperatureResistanceChart.pdf

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rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Fri Apr 11, 2014 6:16 pm Post subject: CHT reading failure

Thanks, Jimdo not archive



On Thu, Apr 10, 2014 at 6:42 AM, h&amp;jeuropa <butcher43(at)att.net (butcher43(at)att.net)> wrote:

  	  Quote: 	
		  --> RotaxEngines-List message posted by: "h&amp;jeuropa" <butcher43(at)att.net (butcher43(at)att.net)>

  

 Rick,

 

 Here is a VDO chart of temp sensors.

 

 Jim Butcher

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=421867#421867

 

 

 

 

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It isn't necessary to have relatives in Kansas City in order to be unhappy.

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