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kerrjohna(at)comcast.net
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 Posted: Tue Nov 27, 2012 10:39 am Post subject: Leaky carburetor |
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New 912ul. Fuel tends to leak from Vent tube and filter. Valve does not appear to leak when actuated by light finger pressure. Have checked float arms adjusted lever to valve slightly but still leaks.
Suggestions
John Kerr
Classic 4 800+ hrs
Sent from my iPad
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lcfitt(at)sbcglobal.net
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| Posted: Tue Nov 27, 2012 12:31 pm Post subject: Leaky carburetor |
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John,
This has been a mystery to me and it is a problem that is frequently
discussed. The only time I experienced it was when I rebuilt my carburetors
and put In the new float needles among the other things. I was told that
there are two different needles, one for the bouncier ULS - at least on
start-up and shut down - and one for the 912 UL. I went back to the old
needles and no further problems. Others have suggested out of balance
carburetors - don't know about that one. My new Model IV has a 1994 engine
and there are no such issues which makes me think it just might be the float
needles. Sorry for just opinions and nothing really helpful.
Lowell
--------------------------------------------------
From: "John Kerr" <kerrjohna(at)comcast.net>
Sent: Tuesday, November 27, 2012 10:39 AM
To: <kitfox-list(at)matronics.com>
Subject: Leaky carburetor
| Quote: |
New 912ul. Fuel tends to leak from Vent tube and filter. Valve does not
appear to leak when actuated by light finger pressure. Have checked float
arms adjusted lever to valve slightly but still leaks.
Suggestions
John Kerr
Classic 4 800+ hrs
Sent from my iPad
|
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Wed Nov 28, 2012 10:52 am Post subject: Leaky carburetor |
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Actually, Lowell, there are at least 3 different float needles, and
they are color-coded on the spring end of the needle. The coloring is
very faint, and you almost have to have them all in front of you to
compare the colors. The one with the weakest spring is the silver
one, the middle strength spring is gold, and the one with the
strongest spring is black. The spring strengths are about 4 oz.,
about 6 oz., and about 16 oz. When I had a Bing on my Jabiru engine,
I ended up using the black-coded needle, along with a larger float
needle seat (3.7 mm), and that proved to be the best for my gravity-
feed fuel system.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062
Prince prop 64 x 30, P-tip
Electroair direct-fire ignition system
Rotec TBI-40 injection (sleeved to 36mm)
Status: flying with 1395 hrs... (since 3-27-2006)
On Nov 27, 2012, at 3:30 PM, Lowell Fitt wrote:
| Quote: |
<lcfitt(at)sbcglobal.net>
John,
This has been a mystery to me and it is a problem that is
frequently discussed. The only time I experienced it was when I
rebuilt my carburetors and put In the new float needles among the
other things. I was told that there are two different needles, one
for the bouncier ULS - at least on start-up and shut down - and one
for the 912 UL. I went back to the old needles and no further
problems. Others have suggested out of balance carburetors - don't
know about that one. My new Model IV has a 1994 engine and there
are no such issues which makes me think it just might be the float
needles. Sorry for just opinions and nothing really helpful.
Lowell
--------------------------------------------------
From: "John Kerr" <kerrjohna(at)comcast.net>
Sent: Tuesday, November 27, 2012 10:39 AM
To: <kitfox-list(at)matronics.com>
Subject: Leaky carburetor
>
>
> New 912ul. Fuel tends to leak from Vent tube and filter. Valve
> does not appear to leak when actuated by light finger pressure.
> Have checked float arms adjusted lever to valve slightly but still
> leaks.
>
> Suggestions
>
> John Kerr
> Classic 4 800+ hrs
>
> Sent from my iPad
>
|
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Fri Nov 30, 2012 5:44 am Post subject: Re: Leaky carburetor |
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Hi John,
If the carbs are fairly old (6+years) and have never been rebuilt it's time. The two most likely causes are float arm height wrong. It should be 10.5mm measured from the edge of the carb. The carb must be off and upside down to measure this. The float needle may need to be replaced. The old style has a red tip and the new is black. If the carb vent tubes are getting different pressure readings because of placement one may be getting a negative pressure. If a float is starting to go bad it will not control the fuel level and it will come out the vent tube. Pull the bowl and pour fuel back in the bowl with the floats. The metal pins should ride even with the fuel level. If one is starting to sink replace them both.
And I forgot that a poor carb sync will make the plane shake and make controlling the fuel level in the bowl too hard and it will spill out the vent.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Last edited by Roger Lee on Fri Nov 30, 2012 8:30 am; edited 1 time in total |
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kerrjohna(at)comcast.net
Guest
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| Posted: Fri Nov 30, 2012 8:14 am Post subject: Leaky carburetor |
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good information thank you. this is a new engine replacing the one that seized when an oil seal failed at the valve lifter tube/crankcase interface. going through the mechanical and pneumatic synchronization now and into the weekend.
John
From: "Roger Lee" <ssadiver1(at)yahoo.com>
To: kitfox-list(at)matronics.com
Sent: Friday, November 30, 2012 6:44:44 AM
Subject: Re: Leaky carburetor
--> Kitfox-List message posted by: "Roger Lee" <ssadiver1(at)yahoo.com>
Hi John,
If the carbs are fairly old (6+years) and have never been rebuilt it's time. The two most likely causes are float arm height wrong. It should be 10.5mm measured from the edge of the carb. The carb must be off and upside down to measure this. The float needle may need to be replaced. The old style has a red tip and the new is black. If the carb vent tubes are getting different pressure readings because of placement one may be getting a negative pressure. If a float is starting to go bad it will not control the fuel level and it will come out the vent tube. Pull the bowl and pour fuel back in the bowl with the floats. The metal pins should ride even with the fuel level. If one is starting to sink replace them both.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center - Heavy Maint. Rated
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=389509#389509
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