Today's Message Index:
----------------------
1. 01:27 PM - Re: 912 Cylinder head coolant temperature Gauge ()
2. 01:47 PM - Re: 912 Cylinder head coolant temperature Gauge (william sullivan)
3. 03:59 PM - Re: 912 Cylinder head coolant temperature Gauge (John Hauck)
4. 06:22 PM - Re: 912 Cylinder head coolant temperature Gauge (Roger Lee)
5. 07:28 PM - Re: Re: 912 Cylinder head coolant temperature Gauge (John Hauck)
6. 07:51 PM - Re: Re: 912 Cylinder head coolant temperature Gauge (John Hauck)
7. 07:54 PM - Re: Re: 912 Cylinder head coolant temperature Gauge (Dave)
Message 1
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| Subject: | Re: 912 Cylinder head coolant temperature Gauge |
Bill,
I know how to "burp" the oil system, but I have never heard of "burping" the
coolant system. How is that done?
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
-----Original Message-----
From: william sullivan
Sent: Saturday, April 14, 2018 4:41 PM
Subject: Re: RotaxEngines-List: 912 Cylinder head coolant temperature Gauge
<williamtsullivan@att.net>
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
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
Message 2
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| Subject: | Re: 912 Cylinder head coolant temperature Gauge |
I have to plead ignorance on Rotax, but a number of automotive engines will hide
an air bubble in the cooling system. The old Jeep 4.0 liter straight 6 was
always doing that. You filled it up after working on it, and had to keep filling
it for a few days until all of the air worked out of it. Maybe John Hauck
knows. It used to drive me nuts, thinking I had a leak and not finding it.
I would just fill it, run it, fill it, and run it over a few days, cooling off
in between runs.
Bill Sullivan
--------------------------------------------
On Tue, 4/17/18, <hgmckay@bellsouth.net> wrote:
Subject: Re: RotaxEngines-List: 912 Cylinder head coolant temperature Gauge
To: rotaxengines-list@matronics.com
Date: Tuesday, April 17, 2018, 4:27 PM
<hgmckay@bellsouth.net>
Bill,
I know how to "burp" the oil system,
but I have never heard of "burping" the
coolant system. How is that done?
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
-----Original Message-----
From: william sullivan
Sent: Saturday, April 14, 2018 4:41 PM
To: rotaxengines-list@matronics.com
Subject: Re: RotaxEngines-List: 912
Cylinder head coolant temperature Gauge
--> RotaxEngines-List message posted
by: william sullivan
<williamtsullivan@att.net>
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!)
Message 3
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| Subject: | 912 Cylinder head coolant temperature Gauge |
Here is how I do it. After draining and refilling, I raise the tail higher than
the nose, MKIII is a tail dragger, and back down. Top it off and rock it up
and back down until I can't put any more coolant into the header tank.
I bleed air the same way you describe Bill S. Until the header tank is completely
full after a flight, shut down, and cool down, I check the header tank. I
keep doing this procedure until all the air is gone. Do the same thing with
all my other water cooled engines to bleed air.
When all air is gone the coolant recovery tank will hit its high mark with the
engine hot and suck coolant out of the coolant recovery tank as it cools. This
keeps air out of the system.
john h
mkIII
Titus, Alabama
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of william sullivan
Sent: Tuesday, April 17, 2018 3:47 PM
Subject: Re: RotaxEngines-List: 912 Cylinder head coolant temperature Gauge
I have to plead ignorance on Rotax, but a number of automotive engines will hide
an air bubble in the cooling system. The old Jeep 4.0 liter straight 6 was
always doing that. You filled it up after working on it, and had to keep filling
it for a few days until all of the air worked out of it. Maybe John Hauck
knows. It used to drive me nuts, thinking I had a leak and not finding it.
I would just fill it, run it, fill it, and run it over a few days, cooling off
in between runs.
Bill Sullivan
--------------------------------------------
On Tue, 4/17/18, <hgmckay@bellsouth.net> wrote:
Subject: Re: RotaxEngines-List: 912 Cylinder head coolant temperature Gauge
To: rotaxengines-list@matronics.com
Date: Tuesday, April 17, 2018, 4:27 PM
<hgmckay@bellsouth.net>
Bill,
I know how to "burp" the oil system,
but I have never heard of "burping" the
coolant system. How is that done?
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
-----Original Message-----
From: william sullivan
Sent: Saturday, April 14, 2018 4:41 PM
To: rotaxengines-list@matronics.com
Subject: Re: RotaxEngines-List: 912
Cylinder head coolant temperature Gauge
--> RotaxEngines-List message posted
by: william sullivan
<williamtsullivan@att.net>
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!)
Message 4
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| Subject: | Re: 912 Cylinder head coolant temperature Gauge |
The coolant system in the 912 is an open system. The fluid seeks its own level
and rarely ever needs more after filling. Because it is an open system it is also
very easy to evacuate the entire tire system.
Fill and go. With all the hoses changes I do every year I never have trapped air
that made a difference.
--------
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479413#479413
Message 5
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| Subject: | Re: 912 Cylinder head coolant temperature Gauge |
I thought I was flying with a closed cooling system all these years. If it
has a pressure cap and coolant recovery system, I call that a closed system.
An open system would be like my old antique tractors, unpressurised and open
to the atmosphere.
I really don't know of an open system on a modern water cooled engine.
Set me straight if I am wrong. Not trying to be argumentative.
I do know the three 912 engines I have owned since 1993, all required
bleeding air and fill/top off through the header tank. There are places in
the engine that do trap air. Maybe the newer engines have different
castings.
john h
mkIII
Titus, Alabama
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Roger Lee
Sent: Tuesday, April 17, 2018 8:22 PM
Subject: RotaxEngines-List: Re: 912 Cylinder head coolant temperature Gauge
The coolant system in the 912 is an open system. The fluid seeks its own
level and rarely ever needs more after filling. Because it is an open system
it is also very easy to evacuate the entire tire system.
Fill and go. With all the hoses changes I do every year I never have trapped
air that made a difference.
--------
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479413#479413
Message 6
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| Subject: | Re: 912 Cylinder head coolant temperature Gauge |
Roger Lee:
Took a quick look in the Rotax 912 Installation Manual. It describes the
cooling system as closed.
john h
mkIII
Titus, Alabama
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of John
Hauck
Sent: Tuesday, April 17, 2018 9:28 PM
Subject: RE: RotaxEngines-List: Re: 912 Cylinder head coolant temperature
Gauge
I thought I was flying with a closed cooling system all these years. If it
has a pressure cap and coolant recovery system, I call that a closed system.
An open system would be like my old antique tractors, unpressurised and open
to the atmosphere.
I really don't know of an open system on a modern water cooled engine.
Set me straight if I am wrong. Not trying to be argumentative.
I do know the three 912 engines I have owned since 1993, all required
bleeding air and fill/top off through the header tank. There are places in
the engine that do trap air. Maybe the newer engines have different
castings.
john h
mkIII
Titus, Alabama
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Roger Lee
Sent: Tuesday, April 17, 2018 8:22 PM
Subject: RotaxEngines-List: Re: 912 Cylinder head coolant temperature Gauge
The coolant system in the 912 is an open system. The fluid seeks its own
level and rarely ever needs more after filling. Because it is an open system
it is also very easy to evacuate the entire tire system.
Fill and go. With all the hoses changes I do every year I never have trapped
air that made a difference.
--------
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479413#479413
Message 7
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| Subject: | Re: 912 Cylinder head coolant temperature Gauge |
Youre right on. And without the overflow tank with a hose submerged in coolant
you will never get rid of the air.
Dave Alberti
> On Apr 17, 2018, at 9:28 PM, John Hauck <jhauck@elmore.rr.com> wrote:
>
>
> I thought I was flying with a closed cooling system all these years. If it
> has a pressure cap and coolant recovery system, I call that a closed system.
>
> An open system would be like my old antique tractors, unpressurised and open
> to the atmosphere.
>
> I really don't know of an open system on a modern water cooled engine.
>
> Set me straight if I am wrong. Not trying to be argumentative.
>
> I do know the three 912 engines I have owned since 1993, all required
> bleeding air and fill/top off through the header tank. There are places in
> the engine that do trap air. Maybe the newer engines have different
> castings.
>
> john h
> mkIII
> Titus, Alabama
>
>
>
>
> -----Original Message-----
> From: owner-rotaxengines-list-server@matronics.com
> [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Roger Lee
> Sent: Tuesday, April 17, 2018 8:22 PM
> To: rotaxengines-list@matronics.com
> Subject: RotaxEngines-List: Re: 912 Cylinder head coolant temperature Gauge
>
>
> The coolant system in the 912 is an open system. The fluid seeks its own
> level and rarely ever needs more after filling. Because it is an open system
> it is also very easy to evacuate the entire tire system.
>
> Fill and go. With all the hoses changes I do every year I never have trapped
> air that made a difference.
>
> --------
> Roger Lee
> Tucson, Az.
> Rotax Instructor & Rotax IRC
> Light Sport Repairman
> Home 520-574-1080 TRY HOME FIRST
> Cell 520-349-7056
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=479413#479413
>
>
>
>
>
>
>
>
>
>
>
>
>
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