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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Zenoah 26 Carburator leaking
03-05-2008 03:34 AM  10 years agoPost 1
Louisiana Aerial Imaging

rrApprentice

Lafayette, Louisiana USA

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At the bottom of the throttle shaft that goes through the carburator I noticed gas dripping from the end of that shaft on the bottom of the carb.. How can I fix this or is their a fix for this? thanks.

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03-05-2008 08:42 PM  10 years agoPost 2
erichevy

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Zevenhoven The Netherlands

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This is happening with my G231 puh with 643 carb also.
I consider it normal. It is fuel which is working it's way out the carb after setting your heli aside for a while.
If you look into the venturi of the carb, you'll see some fuel there also and that's why it can drip of the throttle shaft.

My fix?
Is a tissue stuck under the carb.
My other 2 gasser heli's with 167a carbs don't have this "side effect".
I don't know wether there IS a fix for this?

Eric.

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03-05-2008 09:26 PM  10 years agoPost 3
Louisiana Aerial Imaging

rrApprentice

Lafayette, Louisiana USA

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Thanks for the reply eric,
i just wish i could stop it some how. Its dripping on my camera equipment and camera mount underneath the Heli. Anybody else having this problem with their Zenoah carbs?

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03-06-2008 04:40 AM  10 years agoPost 4
Louisiana Aerial Imaging

rrApprentice

Lafayette, Louisiana USA

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Best carb?
I have the Walbro WT643 carb that is leaking. Is this the best carb available? Im considering buying a new one.

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03-06-2008 04:50 AM  10 years agoPost 5
lazy-b

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Manila, Philippines

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Guys, I'm sure its Not Normal to see a Fuel Leaking out of the Carburator, during the Flight. during Hovering, I notice a Fuel is Leaking.......but able to fixed the problem.

Between the Carburator and Engine, there is a Plastic Insulator, there are 2 Brass tubing on the Plastic insulator. I Files the 2 Brass tubing by 0.5 mm, to make the Brass Tubing Shorter than its Plastic Insulator. the purpose of filing it. is to make sure that the Carburator is Fully Seated on the Plastic Insulation, and the Plastic Insulator is Fully seated on the Engine Block.....This is a very common problem on most ZENOAH Engine.

due to Long use and Vibration, the Plastic insulation will be Squeeze up, and cause a loose and fuel will leak out between the Plastic insulation and Engine Block, too much Thintening will not solve it, cause The Brass Insert will prevent it.....so you need to file the Brass Insert.

Ellion

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03-06-2008 08:01 AM  10 years agoPost 6
FCM

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Surrey, England

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My 603's have never leaked but they are mounted inverted compared with most of the other gasser installations so this may be why.

I have installed a sponge drip tray (actually a bath sponge!) on my cameraship that sits directly below the carbi/fuel tank. This has saved me many times from fuel dripping onto my cameras and mount. It looks really naff but works great!

Paul.

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03-06-2008 06:03 PM  10 years agoPost 7
AceBird

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Utica, NY USA

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If you empty your tank and purge your carburetor the leakage will be a minimum. Something to wick away what drips is a good idea. If the throttle butterfly was not perfectly vertical the problem wouldn’t exist but this was done to give better geometry for the throttle linkage.

Ace
What could be more fun?

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03-06-2008 06:23 PM  10 years agoPost 8
erichevy

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Zevenhoven The Netherlands

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flyinhigh7
Are you talking about fuel leaking while flying, or when the heli is stored only?
Because it is not normal to be leaking while flying, it only happens after a vew day's when stored to my 643.
Btw the 643 is the best carb available for the gasser heli.
Is your fueltank getting pressurized somehow?
If your airvent is locked by a fuel bubble and your heli is stored after a cold day flying in a warm place..
Maybe...

Eric.

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03-06-2008 11:07 PM  10 years agoPost 9
Louisiana Aerial Imaging

rrApprentice

Lafayette, Louisiana USA

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It leaks when just sitting. I dont think its leaking while flying. I cant beleive this is normal? It seems to me it would have a seal on the shaft to prevent the leak. I wanted to fix it not put a band-aid on it. Im kinda dissapointed that i have to put something under it to soak up the gasoline. I guess I gota do what i got do though. Thanks for all your responses.

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03-07-2008 01:41 AM  10 years agoPost 10
FCM

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Surrey, England

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purge your carburetor
Don't do that. If the carbi fully dries out inside, the little NRV can stick. Leave some fuel in the carbi and if you are not flying for some time, purge the carbi with fresh fuel every month or so.

Paul.

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03-07-2008 05:43 AM  10 years agoPost 11
Billme

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MS

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Sometimes they do leak...there are other factors that can play in here...
Running to rich when the ring hasn't seated....Air cleaner to small, or clogged.. All this can effect it...It should be very small if it does leak, like seeing a small semi dry oily stain on the carb, but not visible leaking during flight..

The number one reason is some folks take the spring off the butterfly shaft... YOU can ruin the shaft in a few flights due to vibration...
the reason for the spring is not to keep the carb from going wide open, its to keep the shaft from wearing due to vibration!

Regards,
Bill

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03-07-2008 12:21 PM  10 years agoPost 12
erichevy

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Zevenhoven The Netherlands

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it only happens after a vew day's when stored to my 643.
Btw the 643 is the best carb available for the gasser heli.
Is your fueltank getting pressurized somehow?
If your airvent is locked by a fuel bubble and your heli is stored after a cold day flying in a warm place..
In my case it is an occasional droplet of oil from the fuel (fuel itself is vaporized)
I use a velocity stack and no airfilter, so, that's why not to blaim the airfilter or running too rich either...(in my case that is :0)

Last time I have taken of the carburetor, and on again (to take the engine off) and since then the leaking has stopped.
Look carefully that the leaking might be possible due to a gasket (on both sides) of the carb. which doesn't do its job right!

Eric.

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03-07-2008 05:48 PM  10 years agoPost 13
AceBird

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Utica, NY USA

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Don't do that. If the carbi fully dries out inside, the little NRV can stick.
Paul, where did you come up with that one? Was your engine shipped to you with fuel in the carb? Did the NRV stick when you first tried to run the engine? I don’t even know what an NRV is but for five years in a row I would run my engine dry after a day at the field and didn’t notice any sticking problems. At the end of the season (September) it went into the basement to spring (March) and every time it would start right up. If you leave fuel in the carb and then you let it dry out you could have huge problems, agreed. If you leave fuel in your tank for long term storage then use the purge bulb every so often so the fuel in the carb doesn’t dry up and gunk up the carb otherwise dry everything up.
the reason for the spring is not to keep the carb from going wide open, its to keep the shaft from wearing due to vibration!
You’re a life saver Bill. Now everyone put back on that spring if you are running without it.
which doesn't do its job right!
If it doesn’t do its job why did the leak stop?

Ace
What could be more fun?

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03-07-2008 05:54 PM  10 years agoPost 14
FCM

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Surrey, England

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When your carbi dries out it leaves the 2T oil deposits inside. This is sticky and it sticks the tiny little NRV. It happened to me - that's where I got it from. You can leave yours dry Ace if it makes you happy.

Paul.

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03-07-2008 06:20 PM  10 years agoPost 15
erichevy

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Zevenhoven The Netherlands

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Ace,
If you make a quote, please take my complete "line"
Now it looks like you're trying to make me look bad :0).
Look carefully that the leaking might be possible due to a gasket (on both sides) of the carb. which doesn't do its job right!
Is refering to my dis-assembling the carb, and after that the leaking (so far) seemed to have stopped.

Eric.

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03-07-2008 09:30 PM  10 years agoPost 16
AceBird

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Utica, NY USA

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Eric, I am not trying to make you look bad. If you disassembled the carb and reassembled the carb and now it is not leaking it says something was wrong in the assembly not with the gasket. That is pure logic. I am trying to get you to focus on a phrase that you said instead of a whole paragraph that you may just blow by in reading. If you want to blame it on the gaskets then go ahead but I got news for you; Zenoah is not going to change them.

Ace
What could be more fun?

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03-07-2008 09:55 PM  10 years agoPost 17
erichevy

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Zevenhoven The Netherlands

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I just crawled under my heli and saw another drop of oil hanging on the H needle..
In my case the gasket around the purge bulb is wet.

Eric.

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03-08-2008 07:28 AM  10 years agoPost 18
Louisiana Aerial Imaging

rrApprentice

Lafayette, Louisiana USA

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Thanks for helping me guys, I am running on the rich side as Bill said. Im gonna wark with it and see what i can do. Im going to check on a repair kit for the carb also and may change the gaskets. Its not leaking from the plastic insulator/gasket though. Its still leaking from the shaft. Ill get it fixed somehow! It cant leak like that!

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