---------------------------------------------------------- Zenith701801-List Digest Archive --- Total Messages Posted Thu 09/29/11: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:38 PM - 912 Cooling Problem (greenough) ________________________________ Message 1 _____________________________________ Time: 08:38:11 PM PST US Subject: Zenith701801-List: 912 Cooling Problem From: "greenough" 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message zenith701801-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Zenith701801-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/zenith701801-list Browse Digests http://www.matronics.com/digest/zenith701801-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.