Today's Message Index:
----------------------
1. 12:03 AM - Re: 912 starting problems (Peter Jeffers)
2. 03:49 AM - Re: egt temp (Thom Riddle)
3. 04:05 AM - Re: 912 starting problems (Thom Riddle)
4. 05:09 AM - Re: RotaxEngines-List Digest: 4 Msgs - 06/25/07 (Noel Loveys)
5. 05:15 AM - 912 starting problems (Noel Loveys)
Message 1
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| Subject: | 912 starting problems |
Hi Mark
Probably a slipping sprag clutch. Quite a common problem with older
912=92s.
There is also a modified larger starter motor available from Rotax which
will prevent future problems with the clutch.
Just a thought!!
Pete Jeffers
_____
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of
markdonahue
Sent: 26 June 2007 06:24
Subject: RotaxEngines-List: 912 starting problems
Kitfox model IV with a 912 UL
Does anyone have some thoughts for me as to how to make my engine start
more
easily.
Engine runs fine after starting. Battery is good and turns over
briskly.
Choke pulls to the stop. Throttle on idle. Have checked carbs and jets
all
are clean and all seems clear. If I add a bit of gas at the filter it
will
fire. Seems like its carb related. Spark seems weak, but have changed
ignition wires and no change. And again it runs strong. I have had the
carbs rebuilt at Lockwood, but that was 3 years ago, but it didnt seem
to
make any difference. Any thoughts anyone.
I have 790 hours on the engine.
Mark Donahue
"http://www.matronics.com/Navigator?RotaxEngines-List"http://www.matronic
s.c
om/Navigator?RotaxEngines-List
"http://forums.matronics.com"http://forums.matronics.com
24/06/2007
08:33
24/06/2007
08:33
Message 2
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Noel,
.....When the engine is running lean you will notice more than an
increase in EGT reading. You can get a drop in
power and sometimes even a bit of back firing. This will also
happen when it's past time to refuel.,,,,
Can you elaborate on these statements? I don't understand how running
lean can cause backfiring or what it has to do with being "past time
to refuel".
Not being argumentative, just trying to understand what you mean and
how this happens. Perhaps you should begin with your definition of
backfiring and quantify "past time to refuel".
Thom in Buffalo
Message 3
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| Subject: | Re: 912 starting problems |
Mark,
To get a better idea of what you are experiencing, and a basis for
diagnosing the hard starting problem, please let us know exactly how
you do your start procedure and whether it is hard staring when the
engine is cold or hot etc. What is the idle speed of the engine when
warm? Without observing and getting hands on we would need to know
countless little details to make an intelligent guess at what is the
cause of the problem.
I was called in to fix the hot starting problem on a Katana with 912F
engine AFTER the Diamond distributer "fixed" the problem with a new
battery. I removed, disassembled, cleaned and inspected both
carburetors. This aircraft had over two thousand hours on it and I did
not see any entry in the logbook that the engine had been overhauled,
nor any entry about carburetor overhaul. It turned out that one of the
carbs had a starting jet that was too lean and the other had one that
was too rich, the o-rings in a couple places were brittle and cracked,
and there was a bad gasket on one of the starting carbs (enricher). We
replaced jets with proper ones and replaced o-rings and gaskets. Put it
all back together, did a mechanical and pneumatic synch with proper
idle speed adjustment and problem solved.
My point in telling this story is that your problem could be a simple
single thing like incorrect starting procedure or idle speed
adjustment, or it could be multiple problems that will need attention.
Where are you located?
Thom in Buffalo
Message 4
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| Subject: | RE: RotaxEngines-List Digest: 4 Msgs - 06/25/07 |
P51s were built to be used in the European theatre with Rolls-Royce engines.
That could be the reason for the Celsius gauges.
Noel
> Time: 03:30:26 AM PST US
> From: Gilles Thesee <Gilles.Thesee@ac-grenoble.fr>
> Subject: Re: RotaxEngines-List: Re: Rotax 912 Cooling issue /
> Zodiac CH 601 HDS
>
>
> > Hi Giles,
> >
> > Your right about the temps if he said they were Celcius,
> but he said they were
> F. Most of us here in the US run our gages in F, but you
> have the option of
> using C on a lot of gage sets.
> >
> > Here is an easy, do it in your head, formula for converting C to F.
> >
>
> Roger,
>
> Thank you for your message.
> Yes the temps in question were said to be F, but as they did
> not seem to
> make sense, the possibility of a unit confusion came to my mind.
>
> Re the tip on conversion, as European flyers, we are used to convert
> when dealing with engines from across the pond (though we usuallly do
> convert from F to C).
> Funnily, in P51 field manuals, the engine temps were in
> Celsius during WWII.
>
> Best regards,
> --
> Gilles
> http://contrails.free.fr
Message 5
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| Subject: | 912 starting problems |
I'm not too sure about the carburettor on the 912. If it is one of the
side draft Bing type carbs with the moving main jet than the choke is a bit
of a misnomer on that setup. What is commonly referred to is in fact an
enrichener which allows extra fuel to enter the throat of the carb at low
rpm.
You may find adding a primer, that gives a squirt of gas down the throat of
the carb before starting, may make starting a lot easier for you.
Noel
> Time: 10:25:09 PM PST US
> From: "markdonahue" <markdonahue@earthlink.net>
> Subject: RotaxEngines-List: 912 starting problems
>
> Kitfox model IV with a 912 UL
> Does anyone have some thoughts for me as to how to make my
> engine start more
> easily.
> Engine runs fine after starting. Battery is good and turns
> over briskly.
> Choke pulls to the stop. Throttle on idle. Have checked
> carbs and jets all
> are clean and all seems clear. If I add a bit of gas at the
> filter it will
> fire. Seems like its carb related. Spark seems weak, but
> have changed
> ignition wires and no change. And again it runs strong. I
> have had the
> carbs rebuilt at Lockwood, but that was 3 years ago, but it
> didnt seem to
> make any difference. Any thoughts anyone.
> I have 790 hours on the engine.
> Mark Donahue
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