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     1. 08:38 PM - 912 Cooling Problem (greenough)
 
 
 

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Time: 
08:38:11 PM PST US
Subject: 
912 Cooling Problem
From: 
"greenough" <tebenkof@aol.com>
      
      
      Last time it was an "exhaust leak" that turned out to be the cowl vibrating against
      the coolant radiator.  That was an easy one.  This time my 100 hp 912 is
      overheating evidenced by EGT temperatures rising above 1600*F.  Temps cooled immediately
      with reduced RPM but I had to return to the airport keeping RPM below
      5000.  CHTs and oil tempratures remained in usual range.  On inspection the
      coolant overflow tank is full.  It normally runs half full.  So I suspect an
      air lock in the system.  Is this reasonable?  What could cause it? (it is the
      first time it has happened in 80 hours of flight time.)  And is there a process
      for bleeding what i thought was a self bleeding system?
      
      I did read that if the line from the filler neck to the overflow can collapse this
      may result in failure to suck coolant back in when the coolant cools.  Could
      this be an issue?
      
      I would appreciate any help on this subject. 
      
      Thanks,
      
      Jim Greenough
      
      --------
      Jim Greenough
      
      
      Read this topic online here:
      
      http://forums.matronics.com/viewtopic.php?p=353582#353582
      
      








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