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John Deere Tractors Discussion Forum
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Carb leak

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John51

09-15-2005 17:09:15




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Yes, that much will go through the carb, especially if the gas tank is full. I know from experience on my 2520. The electric solenoid shut-off in the carb died and the float/needle leaked enough to let about a gallon into the crankcase before I realized what happened. On it the gasket above the carb was wet and smelled like gasoline. Check there first.




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ET

09-16-2005 09:24:06




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 Re: Carb leak in reply to John51, 09-15-2005 17:09:15  
I once put a brand new carburetor right from deere on a 2520 and the next day the owner called me up and said it seems a little rich can you come and check it, I'm hauling hay wagons with it today. When I arrived they had just pulled in with a load of hay and there was a trail of gas up the driveway to the tractor. The engine was completly filled with gas and running out the breather pipe that comes out of the valve cover. I never would have believed the engine would run that flooded if I had not seen it with my own eyes. Now I make sure to check the float leval on all new and or rebuilt carburetors that I didn't do myself. We changed the oil and reset the float and the tractor didn't seem to have suffered serious damage.

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Lincoln

09-15-2005 18:30:25




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 Re: Carb leak in reply to John51, 09-15-2005 17:09:15  
I thought of that but wouldn't the gas have to fill up the carb, fill up the intake manifold, then go through an open valve, and into a piston cylinder? Wouldn't the gas have to leak past the rings? Would one of the cylinders be full of gas? Wouldn't the gas run down into the air cleaner before going up the intake. I am not doubting that it could happen, I'm just trying to get it straight in my head.

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G/MAN

09-16-2005 07:33:01




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 Re: Carb leak in reply to Lincoln, 09-15-2005 18:30:25  
Yes, the gas would have to fill up the intake to the point it goes into the head with the gas level in the tank above that level, and then go into the head and eventually into the cylinders, where it would seep past the rings and into the crankcase. It's far more likely that the pump is the problem, as you have apparently found.



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my mistake

09-15-2005 19:01:25




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 Re: Carb leak in reply to Lincoln, 09-15-2005 18:30:25  
The gas wouldn't run down into the air cleaner as the air cleaner tube goes up. I was thinking of one of my other tractors.

I have the pump off. I filled it with water and held my finger over the "out" tube. After building up some pressure it started to leak out the bottom. I hope a new pump will take care of my problem.



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G/MAN

09-15-2005 17:16:38




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 Re: Carb leak in reply to John51, 09-15-2005 17:09:15  
That's true, if the tank were full enough. If the level in the tank was/is below the level of the intake manifold, check the pump.



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