sflem849 said: (quoted from post at 13:47:57 04/04/11)
mkirsch said: (quoted from post at 05:44:33 04/04/11)
sflem849 said: (quoted from post at 05:30:44 04/03/11) The float sticking will cause it to fill the crankcase with gas. It is always a good idea to turn the gas off when you let your tractor sit.
It is practically impossible for the crankcase to fill with gas from a stuck float.
First off, the carb is an UPDRAFT. It is positioned BELOW the intake manifold.
The carburetor and the manifold would have to completely fill with gasoline before any started running into the cylinder. If that were the case, it would be so flooded that it would never start. It would hydrolock on the first crank over.
Second off, there is a drain on the carburetor that lets the gas run on the ground if the carburetor floods. That would have to be plugged before the gas would start filling the manifold.
Third off, the air intake isn't always a perfect seal. Gas would run out around the hoses even if the carburetor drain is plugged.
But it could happen...I agree though. As I got to thinking, it probably wouldn't happen. Your tank would have to be plumb full and a bunch of other stuff. I was pulling off prior experiece with small engines. There it is a lot easier to have happen.
Farmall Cub fuel capacity = 7.5 gallons
1 gallon of gasoline weighs 6.073 lbs
45.5 lbs of liquid weight ABOVE the carburetor, yeah it won't push thru a stuck float and 60 year old rings. Look at what he is saying the problems are.
1.) "Tractor spins longer than normal before it fires. " I would thing the plugs are wet.
2.) "Once it fires like it wants to run, it takes a little bit of choke to get it going from initial fire." Choke helps weak sparkies, that might be trying to burn off gas.
3.)"After the tractor sits and runs for approximately 2 minutes (without choke) at half throttle, it suddenly wants to die. If you play with it, the choke, the engine will stay running." Might be due to a stronger spark since you're burning excess gas.
I would look at the carburetor, and rebuild it. Completly clean all the passages. If it is a stuck float, that would explain alot of this. 45 lbs of downpressure would push UP thru the manifold. GRAVITY WORKS!
-Horsepoor
This post was edited by horsepoor at 06:04:33 04/13/11.
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