... Craftsman riding lawn mower won't start, has new carburetor. Oil originates in the tank and travels via the oil pump into the crankcase, where the crankshaft stays properly lubricated. When I pulled my mower out this evening, there was a mix of oil and gas puddled on the mowing deck with drip spots from the air filter and exhaust. I left it to sit for about an hour and came back to check the oil level and noticed that oil was leaking out of the carberator. Crankcase air leak. A lawn mower that is putting out white smoke usually indicates an engine that is burning oil. Oil blowing into the carb can be a result of a couple of things. Or, you can remove the muffler, drip the excess oil out of the engine, clean it up a little with WD-40 and a rag, reassemble it, and start it up again. I have to add about half quart a day because of this. White smoke can also be caused by incorrect oil grades, air … Overfilling the oil or an excess of oxygen within the engine usually causes this. Briggs & Stratton engine, model 31H777. It was quite low -- so I filled it. Blown head gasket. It is blowing a lot of oil into carburetor through breather tube and the oil turns black just after few hours of use. Worn cylinder and/or rings I put new rings in my JD212 (Kohler 301AQS) engine. ... Every time i make a turn left in 7th. It still blows oil from the breather tube into the carb. Operating engine at greater than a 15 degree angle. model 917.374541 700 series briggs and stratton power-propelled 22" multi cut rotary lawn mower. Inoperative crankcase breather. Originally Posted by GringoSalado It should have some kind of crankcase vent or breather somewhere, likely plumbed to the air box or carb throat (filter side). I email Briggs & Stratton and they told me to replace seals on dipstick. It was blowing oil. After storing it for the winter, I brought it out for use and checked the oil level. Re: Why is my lawn mower blowing oil out of the exhaust? My third problem after a tanker truck totaled our car, several large limbs blew out of the top of a tree across the street and landed on my Toyota 4X4 and messed it up, now the blame lawn mower is blowing oil out just above the carburetor, have had the mower about three months or so. Get shopping advice from experts, friends and the community! The oil could be coming from the breather assembly or it could be coming from the cylinder. If you let it run long enough, the oil will burn itself off. You might smoke out the neighbours but, what the heck If it's a 2 stroke engine any smoke can only come from oil. I have a weird problem with my 16 HP Vanguard thats on my leaf blower. It may... - Toro Lawn Mower I have a mower that is about one year old. Check the oil level and see if it's dropped significantly, remove the valve chest/cover and clean out excess oil. Top up oil and let the engine run to burn off any excess oil. Before the oil can travel into the pump, it needs to pass through a pickup nozzle inside the tank. Well Yuri warned me that troubles travel in threes. Skippy, when you flipped it over, you drained engine oil into the cylinder. Incorrect oil grades. Oil generally only gets into a lawn mower carburetor because it was overfilled by a large amount, or because it was flipped upside down, or run across a very steep hillside. Removing the air filter, it is covered in oil and fuel and more puddled in … and blows the dipstick out of the filler. This nozzle can get clogged from impurities in the oil, causing a backup in the system and a leak out of the oil tank. Blue or white smoke coming from your engine usually indicates burning oil, which can be caused by: Overfilling the crankcase with oil. 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