Gas in my oil.

I have a 1945 Farmall H. My oil smells like there might be some gas in it. Today a hired man was driving it and there was oil coming out of the blow by tube. So I opened the top oil gauge valve and there was alot of oil that came out. Does anyone know what might cause this? And do you think that it might have done any serious damage being that full?

as i hear you had to drain them every so often when running kerocine, sound like she is running very rich
good luck

the carb flooded and filled the motor with gas. check the float on the carb. better change the oil and filter.

Just to add to the other guys, if your running rich and cold, ie thermostat is stuck open and running around 90-120 degrees or so that will lead to crankcase dilution as well.


Andrew

It is NOT POSSIBLE for the carburetor to flood and fill the engine with gas.

The carburetor will leak any excess gas on the ground.

Even if that drain is plugged, the gas will run out around the air cleaner hose.

Let's say on the off chance that the drain is plugged and you somehow managed to get a perfect seal on the air cleaner hose, it would take a LOT of gas to fill up the air cleaner tube and intake manifold before it would start to run into the engine. Unless the tank is about half full, physics says that it can't push the fuel up into the engine. No way, no how.

It would be OBVIOUS the next time you started the tractor up. Gas would be spitting EVERYWHERE as you pumped about a gallon of pure gasoline out of the intake system.

I had a similar issue with my Farmall 350 when I bought it. It would cut out and miss but continue to run. I was getting huge amounts of gas in the oil as one piston would hardly ever fire and the gas ran down the cylinder walls into oil. When I checked the plugs one or two would always be wet with gas. I had the carb rebuilt hoping it would help.

When I installed it the tractor still ran the same way. I kept adjusting it 1/4 turn at a time (as advised by the guy who rebuilt it) with no results. After a couple weeks of this one day I tried to shut off the fuel at the main setting - after about 3 or 4 full turns the tractor suddenly smoothed out and ran great. With it firing on all 4 cylinders the gas quit fouling the oil.

As mentioned below its ALMOST certain that gas is not filling the engine with fuel while its not running. But anything is possible.

anytime the oil is thinned out that is not good.your bringing the oil viscosity down and probably notice a drop in oil pressure as its running past the brgs. faster which creates more brg. wear. also can glaze the sleeves if the engine is not up to operating temp. you will notice this if your tractor starts using more oil than before. to cure this need to run it hot and give her a sniff of bon-amy in the intake at fast idle.

I have seen it hapen twice. AN H and a 350U both with full tanks. They were both hydro locked and we had to pull the plugs to get the fuel out. As well as change the oil. Sorry, but it for certain does happen. Jim

Do you have a live pump on it?

Allan

Catch some of that oil I would use the lower check plug doing it. Be sure yo use a can of some sort. Take it off to the side and use a stick to see if it will burn easy. If it does light up easy and burn you need to change the oil and also check the carb out. It is always a good idea to shut the gas off when ever you park any tractor because gas in the oil is very bad and end up causing you to have to rebuild the engine

its as mkirsch tells it, when the tractor is parked the gas leaks on the ground not into the oilpan.

Sorry can not agree since I have had gas in the oil in more then one tractor. All it takes is having the drain plugged up and then you get gas up to and out of the governor tube on a Farmall and then you have gas in the oil. I have run into it at least twice on Farmalls and 3o r 4 times on the N series fords and also a couple other brands if happens and when it does it can be a engine rebuild. A friends 450 did that not long after he got it and I was glad I caught it before he ran it or it would have been a parts machine since I drained out at least 5 gal. of gas/oil mixed so you can not tell me it can not get there because I have seen it first hand

Yup, fuel dilution from running cold. Pretty common in the winter if you use a tractor every day or so but not long enough for it to get really warm. Manure spreader tractor always did that. Change the oil. Don't worry about what damage might have been done. It's over.

I've had it happen (gas overflowing into the engine/oil) to me to. Carb weep hole was gummed up,plugged up and the air hose was sealed tight with a hose clamp. Carb float stuck open and gas did flood into the engine. I was luckly and noticed it before I started it up. Happened pretty fast. Learned my lesson and now always turn the gas off. Pete

well i quess if the gas was running out of the carb that fast it would have time to fill it up. but on the other hand i would have that kind of problem fixed ,as it would be pretty noticeable with tractor flooding. might have to give mythbusters a job to check into this.

It is very possible for a carb to overflow and fill crankcase, however it will usually cause a liquid lock in cyl also but not always. I have seen a 460 in last two years that filled his crankcase with gas but he did not complain of locked engine. On the other hand, we sold a new 560 to a customer, he drove it home, hooked it to an auger, from a distance he noticed engine started to labor and stopped. He was sure it had siezed so he called up boss, says I do not want this tractor. I personally went out and hauled it into town after verifing that engine would not turn. On the way to town I stopped to check the load and noticed gasoline leaking so shut off gas. I took spark plugs out after I dumped it at shop and cyls were full of gasoline. Cleaned it all up and boss talked customer into taking it back as I had found a faulty float in carb. Tractor ran for many years trouble free. Now, the irony of this story is this. When I was servicing this tractor at a earlier date to get it ready for delilvery in case someone wanted to buy it, I had warmed it up, retorqued head, adjusted valves, went through other predelivery work and then started it to run it out side. Bang, antifreeze shot out of muffler. Pulled engine down, found nut on top of piston had busted hole in head. Also found other nuts inside stove part of intake manifold, parts in oil pan etc. Some one at factory had sabotaged this engine. It was one of the very last 560's to come off the line before shut down at plant to retool for new models. Sooooooo, when customer said engine siezed, you know what I was thinking, that I had missed something and the anti freeze had damaged engine. Turned out ok in long run though.

Again I can not agree with you. All it takes is a simple piece of dirt or rust and the float needle will not seat and if parked with the fuel shut off not closed and you nice and sound in bed it will and does happen and you will not be there to see it happen. Been around and working on engines for well over 40 years now and have seen many odd things happen