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Date: Thu, 12 Apr 2007 08:34:26 -0500
From: Dennis Haverlah <clouduster@austin.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Coolant Level Probe - Will it work
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I have an optical liquid level sensor in my air/coolant 
seperator/expansion tank.  It worked OK in tests.  After ground testing 
the engine for about one hour while auto-tuning and taxi testing, I 
drained some coolant out of the system to expose the coolant level 
sensor to make sure it still worked.  It did not indicate low coolant!  
I removed the probe and found it had a scum deposit - when wiped clean 
it worked.  My engine came out of a 2004 RX-8 and had 9400 miles on it.  
My cooland is 60% distilled water and 40 % Prestone - yellow - 
antifreeze.  I have not added any water-wetter but will check today on 
John Deer's product.  The coolant is always slightly cloudy.  The engine 
had some antifreeze in it when I recieved it and I flushed the coolant 
system.  I also changed the antifreeze after about 4 hours of ground 
operation.  Is there any solution - additive to keep the system cleaner, 
is there a better coolant level dector - or do I need to hire a scum 
cleaner to keep it clean??  I guess I could give up and just watch the 
coolant pressure for clues.

Thanks,
Dennis H.