---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Sun 04/15/18: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:12 AM - Re: 912 Cylinder head coolant temperature Gauge (John Elling) ________________________________ Message 1 _____________________________________ Time: 11:12:37 AM PST US Subject: RE: RotaxEngines-List: 912 Cylinder head coolant temperature Gauge From: John Elling I had a problem like this and finally solved it with a resistor, 1kohm I think, in line with the probe. It is the same fix they recommend for the tach. > 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 > > ------------------------------------------------------------------------------------- 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.