Just through the process of compressing air your pump may put a small amount of oil in the air. If air is blowing out of the air intake then the issue is more than likely in the check valve at the discharge end of the rotary screw. ; The main causes of oil carry-over are excess oil in the reservoir, low temperatures, faulty separator filters and scavenge lines, and oil degradation. the shorter the tube that goes to the intake of the air compressor, the more oil it can pull. Can you tell me what my problem is? Get shopping advice from experts, friends and the community! Switching the piping to the turbo charged side of the intake piping solved our problems. Expired head gasket — When the head gasket blows, heat is inevitable. Can you disregard the air coming out of the oil fill tube if the cap stays on? May not be the answer for your problem, but i have seen this happen. If the compressor bogs down once again, the valve needs to be replaced. In fact, in compressors with major seal wear, the amount of air getting into the sump can blow the oil fill cap right out of the tube, particularly if, over the years, the vent hole has become smaller or plugged. I have a pull behind atlas copco 185 cfm air compressor that has hydraulic oil coming out of the air lines. I did the retrofit and followed the procedure flushing system components and replacing the compressor, receiver/dryer and expansion valve. I checked the oil, added oil, put the dip stick back in, and when I plugged it in and turned it on it was blowing oil out of a small vent hole in the dip stick cap. It is blowing out while the pump is running. I have oil blowing out of the oil breather on the pump. I noticed the dip stick blown out. just stopped while blowing out a sprinkler system. I ordered a new one. The original failure was some years ago and at that time I thought that the pressure switch blew-out spraying oil all over that area. Thanks, Troy —————-Troy, if what you mean by breather is the air intake port (maybe with a filter on it) and oil is coming out there, I suspect two problems. The cap seems to be made with 2 pin holes at the top. will find its way out back through the inlet filter as soon as the element stops turning (pretty quickly). I took the cap off to look inside and when replacing it, the cap snapped. Sure. Excessive Oil in Compressor Discharge Air. What would cause the oil to shoot out? The check valve is used just for that purpose. The inlet valve was completely open and in many cases, it won’t close fast enough to stop the back flow of the oil/air mixture. I turned on my air compressor today, model 921 166400, and oil starting gushing out the oil fill cap. Oil carry-over occurs when the oil that is used to lubricate your air compressor makes it past the separator filter and into the pipes. ... blowing oil out all over the place etc. Hi guy's I have oil blowing out of the dip stick of my air compressor. They get hot as hell when the oil gets low and have been know to … Air Comes Out Of The Oil Fill Cap – The Fix. That compressed air (and oil!) ... Open the tank and drain out the air and water, then close and power back up. What causes - Answered by a verified Mechanic ... using my atlas 185 most of the day. This is normal and an air filter system can help separate the oil in the lines. Then filled with Ester oil containing UV dye. Therefore, it could be time to replace the head gasket. ; Issues can be prevented by monitoring your compressor’s temperature, checking the separator … Excessive Oil in Air Lines. Drain out the oil breather on the pump gushing out the oil cap. Side of the air and water, then close and power back up of! 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