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

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Motor Runs but air comes out

The motor runs but the air comos out the oil filler cap 2 holes at the top
left it running for a weekend by mistake and this is how it ended up any ideas
Thanks Dan

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  • dacamovic Feb 06, 2009

    I have the same problem. I turn on the compressor, no pressure is reading on the gauges and air comes out of the two holes of the oil cap filter.

    How do I go about replaing the piston rings and/or the reed valves in the "head"


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Sounds like you may need to replace the piston rings and/or the reed or similar valves in the "head". I think if the valves were bad you would be getting oil in your air, a lot of oil, but you might want to consider replacing them anyway while you have it apart. I don't think that leaving it running would have hurt it as long as it is cycling on and off.

If it wasn't then the information that follows would be why and/or the problem has been developing for a while.
It may not be now due to the problem that is occuring with the oil isn't allowing it to build pressure.

But all in all it sounds like blow by is getting past the rings into the crankcase and the pressure is forcing the oil out. This is on a piston type. A worm type may have different things causing it.

Posted on Jan 05, 2009

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