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Air compressor wont pump up with vent on blows oil out of crankcase

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It sounds to me that the compression rings on the piston are worn out similar to an automobile engine, also check the reed valves in the head as they may be full of corrosion or gone completely

Posted on Sep 30, 2010

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How can I stop oil from coming from my dipstick?


Depends on the cause.
Blow-by is when oil blows by the rings in the cylinders into the combustion chambers or compression blows by the rings into the crankcase. It can also be caused when too much pressure builds up in the crankcase because of a venting problem.
So blow-by can cause smoke out the tailpipe from oil burning with gasoline, or oil collecting in the air cleaner, or blowing out a seal or other place like your dipstick tube.
If it is caused by worn piston rings, the rings have to be replaced.
If it is a venting problem, you need to open up the vent, like the PCV valve or the air intake port.
If you remove the cap where you add oil and there is a vacuum when the engine is running, the venting system is working. If oil blows out the hole, there is too much pressure in the crankcase.

Nov 29, 2015 | Cars & Trucks

1 Answer

Oil coming out of crankcase vent tube


I'd quicker think piston ring blow by the piston thus compression leaking / blowing into the engines base.

Mar 01, 2014 | Motorcycles

1 Answer

Air hissing out of crankcase vent when not running also oil coming out of vent


You have a serious ring wear problem . The crank case never is pressurised.

Feb 02, 2013 | Air Tools & Compressors

2 Answers

I have 1986 evo 883 sportster, its blowing oil back through the breather hose into the carby filter, the bike has been sitting for a while with the oil drained .....any suggestions would help?


Even though the oil had been drained, this will still happen. The reason is that the oil still left in the engine has had time to run down and puddle in the crankcase. When the engine is restarted, the oil pump cannot pump the oil out of the crankcase fast enough to prevent it from being blown out of the crankcase vent hose. Since the EPA requires that the air from the crankcase vent be "recycled" through the engine and burned, the excess oil is blown into the air filter through the crankcase vent hose. Once the engine is run long enough to clear the excess oil out, it should return to normal. It will clear itself out due to the fact that the scavenger gears in the pump are larger than the feed gears. It pumps out more oil than it pumps in with each revolution of the engine.

Good Luck
steve

Aug 31, 2011 | 1993 Harley Davidson XLH Sportster 883

1 Answer

93 Fatboy oil leaking from vent tube at air filter. oil level is good, not over filled, oil will cover the oil tank on a 100 mile trip


On your '93 model, the crankcase vent is down low on the engine behind the oil pump and it runs up to the air filter through a metal and rubber hose. I don't know how many miles you have on your engine but it you're getting any blow-by on the rings, this will increase the pressure in the crankcase. Most people simply re-route the crankcase breather underneath the bike and plug the hole on the backside of the air filter. Replace the metal line with a rubber hose and put a small filter in the end of the hose. Route the hose back behind the transmission and attach it to the transmission mounting plate just in front of the rear wheel.

This was the way the older Shovelheads were done from the factory for years until the EPA made them start running the crankcase vented air through the engine. In 1994, Harley went to the "head breather" system and moved the crankcase vents to the heads. Still, the oil mist in the vented air builds up in the air cleaner on these models as well.

Good Luck
Steve

Apr 12, 2011 | 1993 Harley Davidson FLSTF Fat boy

1 Answer

The oil dip-stick is blown out of its seat when the compressor runs


Without knowing what make or model you have, check the following:

1. Some, not all, compressor dip sticks have venting holes for the crankcase. If the vent holes are plugged or the check ball is stuck the dip stick will get forced out when the piston comes down.
2. Make sure the oil level is where it's supposed to be. Too much oil in the crankcase will cause the motor to work harder and the excess oil being splashed around the crank case can overwhelm the vents in the case or dip stick and again blow the dip stick out.
3. Worst case, you have worn or broken rings on the piston(s), a hole in a piston or a badly scored cylinder(s) and air is leaking past the piston and creating pressure in the crank case and blowing the dip stick out.

Jan 26, 2011 | Campbell Hausfeld Air Tools & Compressors

1 Answer

1988fxstc. Oil is blowing out of what looks like a oil tank vent hose that ends down by the rear tire. This is not the drain hose, but looks like a venting hose that is open near the rear tire. Anyone...


Without seeing the bike, I would guess that this is the crankcase vent. Originally, the crankcase vent tube came up from behind the oil pump and went to the backside of the air filter. A lot of owners changed the routing of this hose due to oil being blown into the air filter. They simply remove the metal part of the tube and replaced it with a short open ended hose running back and ending just forward of the rear tire.

As for the oil blowing out of the tube, it depends on how much oil blows out of the tube. If it's just a mist that will sometimes coalese into a droplet, this is about normal. But, if it's a steady drip or flowing oil, this is not right.

If the mist is heavy, this could be caused by excessive blowby on the rings creating high crankcase pressures. The use of synthetic oil should not increase the blowby unless the rings are in poor shape, then it will. The use of synthetic oil seems to aggrevate any minor leak turning it into a much larger leak.

If the oil is coming out in a steady stream or pumping the oil out of the engine, you proabably have sheared a key in the scavenge gears of the oil pump and it's not pumping the oil back into the oil tank.

Now there is a vent hose on the oil tank but it should be routed to a fitting on the crankcase that is located just above and slightly behind the top of the oil pump.

Good Luck
Steve

Oct 17, 2010 | Harley Davidson FXST Softail Standard...

1 Answer

Having problems with my champion air compressor


Crankcase vent may be stopped up. Could have too much oil in the compressor.

May 28, 2010 | Champion International Champion 532 2...

1 Answer

My pump has pressure in the crankcase.


this is normal operation to have pressure in the crankcase and it helps with lubrication so proper oil level should be checked regularly and if overfilled would result in oil being blown out of the crankcase vent.

Mar 22, 2009 | Air Tools & Compressors

2 Answers

Mastercraft 2.0 hp air compressor will not build up over 25 psi


sounds like a bad or broken valves in the head. crankcase needs a vent which is sometimes a small hole drilled into the oil fill plug and will normally blow some air out the vent while it runs

Mar 22, 2009 | Air Tools & Compressors

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