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Gas in oil pan

I

Ihcrazy1

New User
350 row crop that keeps filling the oil pan with gas. I put a new shutoff on it last year and thought that would do it. When I pull the gas line, nothing comes through when the gas is shut off.
 
There is no way for the gas to openly flow from the tank to the crankcase.

In order for the gas to fill up the crankcase, it would have to fill up the carburetor, fill up the entire intake manifold, and then flow in through the cylinders. This would be VERY obvious, because the next time you started the tractor it would either hydrolock, or spout a geyser of gasoline out the muffler!!!

The carburetor has a drain to prevent such a thing from happening.

The only other way for gasoline to get into the crankcase is if one cylinder isn't firing, but it would take a LONG time for the gas to "fill" the crankcase this way.

It's amazing how many people don't know what a Farmall is supposed to sound like, and will merrily drive around on 2 or 3 cylinders, "purring like a kitten."

Your tractor should run smoothly like a sewing machine, not pop and sputter like a Harley Davidson or old John Deere. If it's going "rat-tat-tat-tat" not "rrrrrrrrrrrr" then you're missing on a cylinder.
 
First let me say, I'm not familiar with the engine on this model tractor. Now, having said that, the first thing that jumped into my head when you said you had gas in the oil pan is, fuel pump. If this engine has a mechanical fuel pump and is mounted to the side of the engine, gas could be going through the diaphragm and flowing into the oil pan. JMO.
 
(quoted from post at 05:10:36 05/07/13) There is no way for the gas to openly flow from the tank to the crankcase.

In order for the gas to fill up the crankcase, it would have to fill up the carburetor, fill up the entire intake manifold, and then flow in through the cylinders. This would be VERY obvious, because the next time you started the tractor it would either hydrolock, or spout a geyser of gasoline out the muffler!!!

The carburetor has a drain to prevent such a thing from happening.

The only other way for gasoline to get into the crankcase is if one cylinder isn't firing, but it would take a LONG time for the gas to "fill" the crankcase this way.

It's amazing how many people don't know what a Farmall is supposed to sound like, and will merrily drive around on 2 or 3 cylinders, "purring like a kitten."

Your tractor should run smoothly like a sewing machine, not pop and sputter like a Harley Davidson or old John Deere. If it's going "rat-tat-tat-tat" not "rrrrrrrrrrrr" then you're missing on a cylinder.
Click to expand...

Not entirely true. The excess gasoline from a flooded carb can also exit through the governor tube and go directly into the oil pan!!
 
I do not see a way for this to happen. Are you sure it is not hydraulic, and just smells gassy because it is also running rich.
 
Could make sure the drain in the bottom of the bowl is not stopped up. Also shut the fuel off and remove the carburetor bowl drain plug over night with a catch pan under it to check for leak through the shut off.
Are you pulling the tractor to start it after flooding? If its passing the rings running you should have a lot of black smoke. How long does it take to notice the gas in the oil?
With the gas shut off when not running. Fastest way I know for gas to pass the rings and get to the pan is by pulling a bad flooded tractor with a lot of fuel build up in the intake pipe and carburetor after a failed start up with the fuel turned on.
 
Do you mead disconnect the fuel line from the carb?
If that is the case then you have a carb that the float is not set properly or is stuck open.
Have you checked or rebuilt the needle valve and float on that carb recently?
How much gunk accumulates in your sediment bowl? Is it time for a gas tank cleaning?
It's no good to have a nice clean rebuilt carb on there with really dirty fuel going into it.
 
He said that the gas is still getting into the engine even if the fuel is shut OFF.

That means it's only getting in there while the tractor is running.

I want to know how "filling" the oil pan is really getting. Full-full? How much gas is getting into the oil, and how quickly?
 
A 350 should be gravity flow, it has a updraft carb,gas should run out of the carb. before it can get to the governor tube (which I have a hard time believing). Only way for the gas to get in the oil is running to rich, it will wash the cylinder walls down and cause it to burn oil. Running with bad plugs. Check plugs to see if they are wet or extremely black. Another thing also if your float is set to high you may not be able to lean it out enough. How much overfull is your oil level? Do you run it long enough to get it up to operating temp. Tractor needs to get to operating temp to preform right. Hope this helps.
caseman-d
 
(quoted from post at 08:31:51 05/10/13) A 350 should be gravity flow, it has a updraft carb,gas should run out of the carb. before it can get to the governor tube (which I have a hard time believing). Only way for the gas to get in the oil is running to rich, it will wash the cylinder walls down and cause it to burn oil. Running with bad plugs. Check plugs to see if they are wet or extremely black. Another thing also if your float is set to high you may not be able to lean it out enough. How much overfull is your oil level? Do you run it long enough to get it up to operating temp. Tractor needs to get to operating temp to preform right. Hope this helps.
caseman-d
Click to expand...

It is true the carburetor is gravity fed. It is also true that if the float valve is malfunctioning, the carburetor will flood, and yes, the excess gasoline will exit at the intake, but if there is a good, tight connection between the carb and air intake hose, the gasoline will proceed to fill up the intake pipe, but only to a point where it will then be as high in the carburetor as it is in the intake, and then the excess gasoline WILL exit through the governor tube and go directly into the oil pan. The laws of physics do apply here.
 
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