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1. 06:41 PM - CHT (Snazpappy)
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I have a Yak 52 TW. The CHT in the back cockpit is mostly inop indicating zero.
After engine startup I noticed the CHT in the rear cockpit would indicate normally
up through about 200 degrees then the gauge would appear to fail and indicate
bottom of the scale. I did a little troubleshooting today and put both
CHT probes in my dewalt heat gun which can be set in 50 degree increments.
Both gauges read normal up to about 200 degrees F. When the heat was increased
beyond 200 degrees, the rear gauge appeared to fail and the front gauge read
normally. I decided to isolate the rear CHT probe so I put just one probe in
the heat gun to find which was the rear and found the rear gauge continued working
when it was isolated but would read 50-100 degrees lower then the set heat,
when set above 200 degrees, but the gauge continued to function. I then tried
to put the front probe back in the gun, with the rear probe and as soon as
I put the two probes together the rear gauge again appeared to fail.
Both CHT thermocouple are pancaked together and put on the same spark plug on the
back of the engine. I have decided for now to replace both thermocouples to
see if this fixes the problem, not sure what the problem may be, and was wondering
if anyone has any ideas why my gauges are acting this way. I checked the
wiring diagram and both thermocouples are totally isolated from each other
other than be pancaked on the same plug. Both thermocouple s wiring are running
through their own protective sleeves.
Any ideas or suggestions are appreciated.
Thanks
Todd
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http://forums.matronics.com/viewtopic.php?p=511077#511077
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