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Farmall & IHC Tractors Discussion Forum
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gas in my oil!!!!

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andy nelson

09-15-2005 10:14:39




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I have a 350 utility model and it had been running fine. Now, the last time I tried to start it, it seemed to flood terribly and I kept trying to turn it over. It finally started (running rough) but I think gas was blowing out my exhaust pipe and I noticed gas was coming out of my dipstick. I shut it off when I realized what was going on. I went to drain the oil and pulled the plug out and it seemed like I had a couple of gallons of gas come out with the oil. Can anyone give me a clue? thanks.

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old

09-15-2005 18:29:01




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 Re: gas in my oil!!!! in reply to andy nelson, 09-15-2005 10:14:39  
I'm guessing you don't turn off your gas when parked right?? Well guess what, your float needle stuck/leaks and then the carb fills with gas and if an intake valve is open it goes up and slowly goes in to the oil pan. Some will say how in the he**( will it do this but it does. Gas does flow up hill some how, seen it to many times and blown engines because of it. Also look at your air cleaner and think about what happens if the carb intake fills with gas it will end up in the engine and then the pan and if the tank is full enough it will over flow out the oil dip stick. Been there many many times

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EricB

09-16-2005 06:49:51




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 Re: gas in my oil!!!! in reply to old, 09-15-2005 18:29:01  
This is probably due to shutting off a hot engine. As it cools it creates a vacumm and pulls anything in it can get a hold of. In this case an open fuel system.



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Peabody

09-15-2005 12:40:24




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 Re: gas in my oil!!!! in reply to andy nelson, 09-15-2005 10:14:39  
This doesn't make sense, since the 350 has an undraft carbureator, there's no way for gas to leak from the carb or gas tank to the crankcase. Sounds more like someone poured gas in the crankcase.



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Janicholson

09-15-2005 13:04:26




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 Re: gas in my oil!!!! in reply to Peabody, 09-15-2005 12:40:24  
Dear Peabody,
The fuel will leak into the carb through jets, fill the intake manifold to the top, run into the cylinders through the open intake valve, and seep past the closed valves. From the cylinder it drains down the rings and fills up the crankcase. This continues until the level of fuel in the tank reaches equilibrium with the level of the intake tract/manifold.
Tractors should never be left with the fuel valve on due to this possibility. If cranked, they can suck slugs of fuel into the cylinder/s and (because it doesn't compress, it can bend rods, break cranks, force out head gaskets, and do mayhem. In addition to allowing metal to metal contact at the rings and bearings. It isn't majic, it is gravity.
I own a 350ute, and Ive seen it twice. Once educated me, and the other educated my dad. We were lucky not to dammage the engine.
JimN

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Peabody

09-15-2005 18:18:19




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 Re: gas in my oil!!!! in reply to Janicholson, 09-15-2005 13:04:26  
OK, JimN. Calf Rope. It's just that all the worn-out Farmalls I've ever dealed with NEVER had an air intake hose to the carb tight enough that gas wouldn't have leaked out onto the ground before flowing up the carb and manifold and going into the valves. As has been said & I practice religiously, ALWAYS CLOSE THE GAS SHUTOFF BELOW THE TANK after each use.



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chadd

09-15-2005 13:01:02




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 Re: gas in my oil!!!! in reply to Peabody, 09-15-2005 12:40:24  
Yeah, I was just thinking the same thing. Wouldn"t the entire intake tube all the way up to the manifold have to fill with gas in order for it to run into the engine? I would think it would start leaking out of the intake hose before that would occur. And if there was gas sitting in the bottom and it got sucked up when it he attempted to start it, I sure wouldn"t think that there would be 3 gallons in there. It makes sense on a John Deere where the carb is above the engine, but I don"t see how that is possible with the IH arrangement. Would someone mind explaining it to me?

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VernMN

09-15-2005 11:54:42




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 Re: gas in my oil!!!! in reply to andy nelson, 09-15-2005 10:14:39  
Funny, I just had the same thing happen with my H. Tractor had been sitting and I noticed the tank was empty. I put 6 gallons in and went to start it but it would not. I run the battery down and had to put the charger on. Next day I seen gas leaking and found it was coming from the front seal. Checked the oil level cocks and drained out 3 gallons of gas and oil. My carb is off for an overhaul too. Hope the seal will soak up again with oil.

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Janicholson

09-15-2005 11:16:36




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 Re: gas in my oil!!!! in reply to andy nelson, 09-15-2005 10:14:39  
You have a classic case of carb flooding. There is a piece of junk under the needle in the float chamber. or the float has sunken due to a pinhole in it, or the float has contacted the side of the carb bowl causing it to stick down, or the needle is worn and failed to seat on the seat. All of these require at least the disassembly of the bottom of the carb. Not difficult at all. The first action (started now and continued till the tractor, or you are gone) is to shut off the fuel at the tank valve (little brass stem at the sediment bowl) every time you leave the tractor for more than 10 minutes. This includes after you fix the flooding. Change the filter and the oil, the dilution will ruin engine parts, and can become explosive.
JimN

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Janicholson

09-15-2005 13:19:22




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 Re: gas in my oil!!!! in reply to Janicholson, 09-15-2005 11:16:36  
By the way if your intake system is leaking radically it is sucking dirt and contaminated air into the intake after the filter. Ours hoses are tight and new. our shaft on the choke would have been weeping fuel (it is not oringed, but the fuel can enter faster than this minor leak. As it happens, we aren't looking at the tractor, it is in the barn, or standing on it's own. When we get around to it, (unless we catch it in the act) the carb has drained the tank to the level of the choke shaft, and the engine is drained down and may turn over without hydraulic lock.
Just down stream beer, been through the kidneys once, JimN

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504

09-15-2005 18:21:18




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 Re: gas in my oil!!!! in reply to Janicholson, 09-15-2005 13:19:22  
Andy, Check your air filter bowl,I`ll bet a dime that it will be full of gas too.(been there and done that)



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