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OT air compressor

A

avant 1735

Member
I have a gas powered air compressor, it builds pressure to about 20 lbs then starts throwing oil through the vent hole on the fill stopper. I am thinking the rings are bad, or is this a symptom of bad reeds. Any help will be greatly appreciated. Thanks
 
very possible a broken reed valve. Post a follow up of the problem once found so we can all learn.
 
It could be rings. Rings tend to last a long time on a compressor though. Anything is possible, but unless something unusual has happened, like stored with moisture in the cylinders, or something scored a cylinder, rings would not be my first area of suspicion.

Any history on the compressor? Is this something that just started?

Is there any other crankcase vent that could be clogged?

Bad valves will show as slow recovery, or intercooler over heat/over pressure if it's a 2 stage.

Some unloader systems have oil pressure operated components. Possible that something could be feeding air back into the crankcase. Look over all those possibilities first.
 
Try changing the oil. If water gets in the oil, condensation, when the water heats up and expands it may throw the out.
geo.
 
Hypothetically if you were to pressurize the crankcase all that should come out the vent hole is air, give or take a little fluid film that the crank may splash around when it is running.

Is the oil at the proper level?

Is it sitting reasonably level?

Do you have the proper oil in it?

Could water have gotten into it which would raise the oil level?

I had a head on a 60 gal upright that would push out oil, it looked like a greasy mess but in reality it would only loose about a teaspoon of oil in 6 months.
Used it for 30+ years like that before I replaced it with a bigger compressor.
 
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