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1. 11:12 AM - Re: 912 Cylinder head coolant temperature Gauge (John Elling)
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| Subject: | 912 Cylinder head coolant temperature Gauge |
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
>
>
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