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Gas in OIl

The needle and seat is leaking and gas runs past the rings into the crankcase. Make a habit of turning the gas off when you shut the tractor down,even after fixing the carb.
 
Sounds like you do not shut the valve off at the gas tank when you park it and this is common with tractors. Caused by a sticking float or a little rust/dirt in the needle seat then gas flows down into the cylinders past the rings and into the oil and many a tractor has been blown up because of that as in rod bearing going and then a rod out the side of the engine
 
well...
if you have an updraft carb.. as most gas tractors do,,

it would be a bad fuel pump diaphram..

or your rings are bad,

or your piston is cracked,

or as the others said... your carb float is leaking and its filling up the carb, up the manifold, up the air filter, and finally 20 gallons later it gets up to the head and leaks into the cylinders,, then seeps past the piston rings and into the crankcase.
 
Its a John Deere and the gas tank is higher than the cycls. Shut the gas off when you stop the engine and that will cure the problem better yet shut gas off and let the carb run dry.
 
You could also have the fuel shutoff that uses oil pressure to open and close the diaphram. Could have bad diaphram's.
 
If it were my tractor, I wouldn't like to shut the gas off each time I turned the tractor off. Instead, I would install an electric shutoff valve like is on my backhoe. I think they are called a solenoid valve. Of course you would need a 12 v battery and an old JD B may not have a battery.
 
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