---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Sat 04/14/18: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:08 PM - 912 Cylinder head coolant temperature Gauge () 2. 12:17 PM - Re: 912 Cylinder head coolant temperature Gauge (John Hauck) 3. 01:41 PM - Re: 912 Cylinder head coolant temperature Gauge (william sullivan) ________________________________ Message 1 _____________________________________ Time: 12:08:33 PM PST US From: Subject: RotaxEngines-List: 912 Cylinder head coolant temperature Gauge I have the new cylinder heads on my 912 UL engine. I am measuring the coolant temperature using the normal Rotax (VDO) gauge. During engine operation my gauge needle is quickly fluctuating (swinging) as much as 10 to 30 degrees Celsius between zero and 80 degrees C. After landing and engine ignition circuits are cut off and the engine stopped, but with current still on the instruments (i.e. key on the =9Con=9D position the VDO gauge needle is steady at 80 degrees C. As the engine cools the needle drops. The wiring and connections from the sensors to the gauge are sound and tight. Could I have a problem with the coolant pump on the engine varying the coolant flow and thereby causing the sudden temperature variation indications on the VDO gauge? Any ideas or suggestions? Hugh G. McKay III, P.E. Fellow, L.M. ASCE Senior Consultant Worldwide Engineering Inc. 4090 North NC Hwy. 16 Denver, NC 28037 Ph. 704-661-8271 Fax 704-483-5466 email hgmckay@bellsouth.net http://www.wwegeo.com ________________________________ Message 2 _____________________________________ Time: 12:17:44 PM PST US From: "John Hauck" Subject: RE: RotaxEngines-List: 912 Cylinder head coolant temperature Gauge Make sure all the air has been bled out of the cooling system. How is your coolant recovery tank behaving? Normal? john h mkIII Titus, Alabama From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of hgmckay@bellsouth.net Sent: Saturday, April 14, 2018 2:08 PM Subject: RotaxEngines-List: 912 Cylinder head coolant temperature Gauge I have the new cylinder heads on my 912 UL engine. I am measuring the coolant temperature using the normal Rotax (VDO) gauge. During engine operation my gauge needle is quickly fluctuating (swinging) as much as 10 to 30 degrees Celsius between zero and 80 degrees C. After landing and engine ignition circuits are cut off and the engine stopped, but with current still on the instruments (i.e. key on the =9Con=9D position the VDO gauge needle is steady at 80 degrees C. As the engine cools the needle drops. The wiring and connections from the sensors to the gauge are sound and tight. Could I have a problem with the coolant pump on the engine varying the coolant flow and thereby causing the sudden temperature variation indications on the VDO gauge? Any ideas or suggestions? Hugh G. McKay III, P.E. Fellow, L.M. ASCE Senior Consultant Worldwide Engineering Inc. 4090 North NC Hwy. 16 Denver, NC 28037 Ph. 704-661-8271 Fax 704-483-5466 email hgmckay@bellsouth.net http://www.wwegeo.com ________________________________ Message 3 _____________________________________ Time: 01:41:53 PM PST US From: william sullivan Subject: Re: RotaxEngines-List: 912 Cylinder head coolant temperature Gauge I am thinking the same way John is. You have an air bubble, and is has to be burped. The other option, as always, is a loose wire. Bill Sullivan Tarboro, NC (recently escaped from Connecticut!) -------------------------------------------- On Sat, 4/14/18, wrote: Subject: RotaxEngines-List: 912 Cylinder head coolant temperature Gauge To: "Rotax Engines" Date: Saturday, April 14, 2018, 3:08 PM I have the new cylinder heads on my 912 UL engine. I am measuring the coolant temperature using the normal Rotax (VDO) gauge. During engine operation my gauge needle is quickly fluctuating (swinging) as much as 10 to 30 degrees Ph. 704-661-8271 Fax 704-483-5466 email hgmckay@bellsouth.net http://www.wwegeo.com ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-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/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-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.