Question about Craftsman 3 gal. Air Compressor, 1.5 hp, Horizontal k

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My compressor also will not build over 20 lbs of pressure. Air is coming out of the Oil fill cap air vents. Is air supposed to be coming out of these vents?

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You should not have air coming out of the vent cap. From what you've stated here I believe your piston rings and/or cylinder are damaged to where air is getting past them and going back into the crank case. It's possible you have a frozen valve plates so check them on your way to the piston and cylinder.

Posted on Sep 09, 2010

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