Today's Message Index:
----------------------
1. 03:03 AM - Re: Replace Needle? (Gilles Thesee)
2. 04:59 AM - Re: Replace Needle? (Thom Riddle)
3. 05:50 AM - Re: 912 carb overhaul (Catz631@aol.com)
4. 08:08 AM - Re: Replace Needle? (Jack Kuehn)
5. 08:14 AM - Re: Re: 912 carb overhaul (Jack Kuehn)
6. 08:35 AM - Re: Re: 912 carb overhaul (Gilles Thesee)
7. 08:37 AM - Re: Replace Needle? (Gilles Thesee)
8. 02:22 PM - Re: Replace Needle? (Roger Lee)
9. 05:46 PM - Re: Re: Replace Needle? (Paul McAllister)
Message 1
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| Subject: | Re: Replace Needle? |
Jack Kuehn a crit :
>
> I just rebuilt the carbs on my 912 yesterday,.....
> These items were all showing their age
> at 120 hours,
Hi all,
Just to say I am a bit astonished to hear some of you guys are in need
of rebuilding their 912 carbs after such a short time as 120-200 hours.
Did you experience any particular trouble ?
In my area, the Rotax gurus advise a carb overhaul at engine midlife, ie
600 hrs.
We have about 180 hrs on our 914 engine, and it runs like new. One of my
buddies has just rebuilt his carbs at 780 hrs, and only the float bowl
needle valves showed signs of wear.
Best regards,
--
Gilles
http://contrails.free.fr
Message 2
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| Subject: | Re: Replace Needle? |
The only time you need to replace the butterfly on the Bing 64 is if
it is loose, damaged or the shaft is worn out. I've never replaced one
on any of the 64s I've rebuilt. The last ones I serviced were on a
Std. Category Katana with 912F which had well over 2,000 hours on it
(engine had not been overhauled or replaced) with zero carb. service
in the log book. It was way way past carb service time and had some
serious starting and running problems due to lack of carb. service.
The butterfly valves were in fine shape. After servicing and balancing
the carbs. it ran like a sewing machine.
Thom in Buffalo
http://riddletr.googlepages.com/a%26pmechanix
Message 3
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| Subject: | Re: 912 carb overhaul |
Last week I finished the Lockwood Rotax school. We completely went through
the carb(each of us had a carb to disassemble and rebuild) and it was a very
good course. One of the things they mentioned was to NEVER take the screws out
of
the butterfly valve. The chances of messing it up are great! They said to
send it in for overhaul if for some reason you need to do that. I just replaced
the diaphragm and float needle in my 912 yesterday at 150 hours and like
Jack, the parts I replaced were in great shape (even though it had been at least
10 years since they were done and replacement should be done every 5 years)
except for the float bracket which had a dimple in it and will have to be
replaced.
I purchased my Kitfox 2 months ago and am going through the engine to update
it as it is an early engine. (carbs,hoses,etc.) I only mention the butterfly
because the instructor emphasized not to do it. I know most of you guys know
more about these engines then I do.My background is Lyc/Cont. I went to school
to learn about the Rotax 912
Dick Maddux
Kitfox 4-1200
Pensacola, Fl
**************Biggest Grammy Award surprises of all time on AOL Music.
(http://music.aol.com/grammys/pictures/never-won-a-grammy?NCID=aolcmp003000000025
48)
Message 4
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| Subject: | Re: Replace Needle? |
The Bing Carb manual says very clearly to replace the diaphragms
yearly. I think you are right about the needle and jet, but the float
valve and the diaphragm should be replaced BEFORE any problem is
encountered, and while you are in there, you might as well replace the
O-rings! It is good to know you are able to go for so long, perhaps
the Bing folks are feathering their own nest!
Jack
On Feb 2, 2008 4:00 AM, Gilles Thesee <Gilles.Thesee@ac-grenoble.fr> wrote:
>
> Jack Kuehn a crit :
> >
> > I just rebuilt the carbs on my 912 yesterday,.....
>
> > These items were all showing their age
> > at 120 hours,
> Hi all,
>
> Just to say I am a bit astonished to hear some of you guys are in need
> of rebuilding their 912 carbs after such a short time as 120-200 hours.
> Did you experience any particular trouble ?
> In my area, the Rotax gurus advise a carb overhaul at engine midlife, ie
> 600 hrs.
> We have about 180 hrs on our 914 engine, and it runs like new. One of my
> buddies has just rebuilt his carbs at 780 hrs, and only the float bowl
> needle valves showed signs of wear.
>
> Best regards,
> --
> Gilles
> http://contrails.free.fr
>
>
--
Jack Kuehn
5565 Brady Ln
Lolo, MT USA 59847
(406)273-6801
(406)546-1086 cell
jack.kuehn@gmail.com
(406)273-2563 fax
Message 5
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| Subject: | Re: 912 carb overhaul |
The only reason to remove the throttle butterfly is to replace the
O-ring on the shaft. This is one O-ring that would likely see some
wear, it would seem to me, because it moves each time you use the
throttle! If it wears out and leaks, you have a manifold leak. WHat
is the problem with taking out the screws? WHat did they say is going
to get messed up? If you pean over the threads on the new screws, how
can there be a problem? And it is not that difficult to assemble the
shaft/butterfly so that it operates as good as new.
Jack
On Feb 2, 2008 6:47 AM, <Catz631@aol.com> wrote:
>
>
> Last week I finished the Lockwood Rotax school. We completely went through
> the carb(each of us had a carb to disassemble and rebuild) and it was a very
> good course. One of the things they mentioned was to NEVER take the screws
> out of the butterfly valve. The chances of messing it up are great! They
> said to send it in for overhaul if for some reason you need to do that. I
> just replaced the diaphragm and float needle in my 912 yesterday at 150
> hours and like Jack, the parts I replaced were in great shape (even though
> it had been at least 10 years since they were done and replacement should be
> done every 5 years) except for the float bracket which had a dimple in it
> and will have to be replaced.
> I purchased my Kitfox 2 months ago and am going through the engine to
> update it as it is an early engine. (carbs,hoses,etc.) I only mention the
> butterfly because the instructor emphasized not to do it. I know most of you
> guys know more about these engines then I do.My background is Lyc/Cont. I
> went to school to learn about the Rotax 912
>
> Dick Maddux
> Kitfox 4-1200
> Pensacola, Fl
>
>
> ________________________________
> Who's never won? Biggest Grammy Award surprises of all time on AOL Music.
>
>
--
Jack Kuehn
5565 Brady Ln
Lolo, MT USA 59847
(406)273-6801
(406)546-1086 cell
jack.kuehn@gmail.com
(406)273-2563 fax
Message 6
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| Subject: | Re: 912 carb overhaul |
Jack Kuehn a crit :
>
> The only reason to remove the throttle butterfly is to replace the
> O-ring on the shaft. This is one O-ring that would likely see some
> wear, it would seem to me, because it moves each time you use the
> throttle!
Agreed, but according to our Rotax dealers, the throttle is best left
alone as long as there is no problem. Which they say is rare.
After all, in a 2 hour cross country flight, the Rotax throttles won't
move much : some movement at engine checks, then travel from idle to
full throttle, then back to cruise setting until approaching destination
Adding those angular movements will not amount to more than the
equivalent of a few turns, which O-ring can easily endure many many times.
> If it wears out and leaks, you have a manifold leak. WHat
> is the problem with taking out the screws? WHat did they say is going
> to get messed up?
One should be careful to file away the peened screw ends lest the
threads in the throttle shaft get damaged when removing the screw.
Best regards,
--
Gilles
http://contrails.free.fr
>
>
Message 7
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| Subject: | Re: Replace Needle? |
Jack Kuehn a crit :
>
> The Bing Carb manual says very clearly to replace the diaphragms
> yearly.
The advice I got is change the diaphragm every two to four years,
whatever the flight hours.
> It is good to know you are able to go for so long, perhaps
> the Bing folks are feathering their own nest!
Maybe ;-)
Best regards,
--
Gilles
http://contrails.free.fr
Message 8
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| Subject: | Re: Replace Needle? |
Hi Guys,
Rebuild times usually can be found in your operating handbook or scheduled maint.
time table book. My book says rebuild at 200 hrs. I do agree that they were
probably ok, but mine is an SLSA and I have a fairly strict time table for inspections.
--------
Roger Lee
Tucson, Az.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=162083#162083
Message 9
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| Subject: | Re: Replace Needle? |
Hi All,
Well I had my 914 carbs overhauled at 650 hours by Lockwood Aviation in November.
I did this because according to the manual they were long over due, but the
engine was running quite nicely.
To me honest, I sincerely regret messing with it. It took me about 4 goes at trying
to get the turbo manifolds sealed up again, I was messing with it for ages
before I could get full boost at 10,000'. Even now it is running richer than
before and using more fuel and I am probably going to have to mess with the
needle position to get then working properly again.
There is a lot to be said for, "if it ain't broke don't fix it". I can say for
sure I will not be rebuilding in another 200 hours time.
Just my 2 cents worth
Paul
Europa N378PJ
http://www.europa.net.nz/363/index.html
Never miss a thing. Make Yahoo your home page.
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