carb freeze

Anonymous-0 · Nov 23, 2009

my 560 will sit and run all day give it some gas and go out though the feild and it dies the carb and intake gets frosted give it some chock after a minit and starts right up the more gas u give it the worst it gets. hot or cold day same thing . set carb diffrent ways same thing took intake apart all seems fine. whats wrong?

pete 23 · Nov 23, 2009

You say you took intake apart, do you mean seperated from exhaust manifold to clean passages around intake (stove) and or repair heat riser. Is spring good and riser working properly. Other wise, if you have the old style double venturi they are nortorious for doing this no matter what you do to manifold. You can replace venturi with single, should have some other jet modification also but venturi in itself will usually eleminate problem.

riverbend · Nov 23, 2009

I'm not sure. It sounds like your tractor is swallowing it's tongue when you give it some throttle. That may or may not be related to the frost.

All carbs frost up when the tractor is first started on wet chilly days. I think the venturi is acting like the expansion valve in a refrigeration unit. Once my tractor (H) warms up, the frost melts away, but it generally runs fine.

When your carb is frosted up and the tractor dies, take the carb off and look inside it. Is the ice covering the idle fuel port ? If so, that's the problem and once the ice melts, you're good to go.

If it the same on a hot day, I'm guessing something else is wrong with your fuel system. Try posting again with a few more details on what happens. Will it ever take full throttle ?

Greg

Anonymous-0 · Nov 23, 2009

i can let it run for a hour then go though the feild and it will do it it will take full gas siting ther but put a load on it and it will freeze and stall the heat rizer spring is gone but i have put it open or closed and it will do the same thing

Anonymous-0 · Nov 23, 2009

the spring is gone but put it open or closed same thing happens not sure what u mean on the double venturi

grg1938 · Nov 23, 2009

Some how you have to get heat to the carb. You may also have moisture in your fuel (try fuel line deicer).

Janicholson · Nov 23, 2009

This time of year, and in wet air at 35 to 45 degrees the carb will freeze as described.
putting warm air into the intake stack will help dramatically. Pull off the precleaner, and attach a radiator rubber hose to the stack. (it will need to be pretty long on this tractor as the muffler is a ways from the stack) Fabricate a shroud for the muffler that slips down over the muffler and surrounds the fat part of the muffler (made from a 6 inch galvanized stove pipe, with some supports across the top and bottom to keep it centered, with a fitting in the side to attach the above hose. This will draw warm air into the intake and prevent icing.
All carbureted automobiles had them in the 60s (till carbs were phased out) to prevent this problem. Their heat was drawn from the exhaust manifold. It is ugly but effective. It can also be taken off most of the time. JimN

pete 23 · Nov 23, 2009

Double venturi is like a small venturi inside of the large one, three supporting legs on it, all one piece though. Ih had a change over kit . You need to have a spring on your heat riser though and have it working freely so hot exhaust can preheat the manifold when lightly loaded and allow it to move to cold positiion under heavy work conditions.

heavy hauler too · Nov 24, 2009

Un plug the two holes in the manifold right on top of the carb, Take the farmer way a 16 penny nail. Ha !!

dirtdog38 · Nov 24, 2009

only one venturi. wouldent u think after it ran for a hour and the flap closed in the intake and at half to full gas it would be hot enough to kept fromm freezeing. it will do it at 75degrees outside as easy as 50. sounds and runs great sitting ther. go though the feild and it freezes.

riverbend · Nov 24, 2009

I'm guessing that you have an other problem. The frost is incedental or a red herring. After idling for an hour, your tractor should be fully warmed up.

Is the carb actually the one for a 560 ? It sounds like the mixture is too lean when you pull the throttle open. What happens if you run it with a little choke and go to WOT ? How do your plugs look ?

Greg

dirtdog38 · Nov 25, 2009

dont now if it is oem but looks it. and i have leaned it out and riched it up plugs all burn good cant get it to lean but can make it blow black smoke when i richen it up.but both ways it sounds great sitten. but go out though the feild it wil die. sometimes if i stop soon enough idal down it will stay running. give it a few minits and u can go

LenNH · Nov 29, 2009

The venturi acts like a refrigerator. Airplane engines have "carb heat" from a shroud over the exhaust. Carb icing is especially prevalent when the engine is slowed way down, like on approach a mile from the airport, and the air is moist. Enough ice can form so that the engine will quit. Not much fun when you're a mile from the runway and have no power. Not much danger for a tractor, but still, icing could be taking place just as in an airplane engine.

carb freeze

Anonymous-0

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pete 23

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riverbend

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Anonymous-0

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Anonymous-0

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grg1938

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heavy hauler too

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riverbend

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LenNH

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