Today's Message Index:
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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)
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| Subject: | 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
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| Subject: | 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
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| Subject: | Re: 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, <hgmckay@bellsouth.net> wrote:
Subject: RotaxEngines-List: 912 Cylinder head coolant temperature Gauge
To: "Rotax Engines" <rotaxengines-list@matronics.com>
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
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