All sounded spot on to me. Almost all 4 stroke mower engines have a crankcase breather. Now all engines have some degree of blow by. Here is some of the possible issues, 1. If the amount of air coming out of the oil fill dipstick vent is noticeable, that indicates a problem. The bloke then said, "nope sorry, don't want it, too much pressure there." From my experience most motors will blow air from the oil filler cap due to the pressure generated in the crankcase from all of the moving components. Afaik this engine doesn't have a pcv valve, so the crankcase breather can't be the problem. There was no tappet noise, despite the cold weather up here. I pressurized to 20 PSI and I could hear and feel air coming out the dipstick tube. Worn rings on one or more cylinders. Joined Sep 23, 2015 Threads 1 Messages 1. engine breather is working, due to visible gases in the breather chamber. Is air coming out of the oil fill tube on your air compressor? If it has become blocked with crud, air pressure may build up on the sump and blow the cover, and oil, out … The problem in both cases is that the piston seal or seals are worn to the point where lots of air or oil is bypassing those seals. Air pressure under oil filler cap.. Just had a guy come and look at my mondeo estate. I connected a leakdown tester to the spark plug hole and turned engine to TDC. I have a 2001 Clio 1.2 8v D7F746, and oil and air coming from oil filler cap and the dipstick cap. there was no smell of gas in the oil, the bike runs great but i was concerned about the amount of air pressure. 2. All was going well untill i started the engine. One symptom an air compressor will experience if it has this compressor problem is that air compressors with air coming out of their intake filter, or when the filter is removed the underlying intake port, will take much longer than normal to reach the normal cut out pressure level. I bet if you take and crack open the oil fill cap it would make a mess blowing oil all over too. Sep 23, 2015 #1 i have an 18.5hp . i changed the oil and filter and wipe dry the air box and rung out the air filter, added only two liters of oil turned the enginge to get oil the the filter. that is why you have an emission hose running from the engine to the air box so the pressure will not build up inside the engine and blow the seals out. If you have excessive air forcefully coming out you dip stick, it's "blow by." ... had a “steady stream of air” coming out of the dipstick vent hole. If the amount of oil coming out of the tank drain is excessive, that indicates a problem. The emission filter is located under the air filter, probably wouldn't hurt to chech and clean it. Once the engine is started you don't want any way for extra air to enter the crankcase. No smoke etc. That kind of pressure would be blowing valve cover gaskets, oil pan gaskets, and various seals out all the time. Then his expert friend removed the oil filer cap. I took the oil filler cap off and had a lot of positive pressure mixed with oil mist come out of the dipstick tube. I measured cylinder pressure, all of them are 190 PSI dry, although I didn't do a wet test. Leaky gaskets and an improperly sealing dipstick or oil cap may also increase pressure in the crankcase past the ability of the breather system to remove the pressure. But it's normal for air to come out while running. it is blowing oil up the dipstick which is causing it to mix with the fuel pump. Thread starter apw; Start date Sep 23, 2015; A. apw Forum Newbie. Reply to original poster or commenter. blowing oil out dipstick. The cold weather up here ca n't be the problem does n't have a crankcase breather ca n't be problem! Pressure would be blowing valve cover gaskets, and oil and air coming out of the oil filler cap and... Sorry, do n't want it, too much pressure there. apw ; Start Sep. 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