Mike:
If you have air blowing out of the oil filler cap, I would suspect that the piston rings are shot. The piston rings are supposed to keep the compressed air above the piston, and air seems to be leaking past the piston rings into the crank case.
SOURCE: Was working normal suddenly will not build pressure
Maurader1 an apprentice has this problem solved and is spot on. All these gurus and wiz need to stick to the basic and common sense. The first place your pump will give out after use or abuse is the gasket. All this garbage about defective reeds and defective pressure switch is a lot of nonesense if you first don't rule out the most common problem the head gasket. I'm cheap and this thing has paid for itself 10 time over. You can get a gasket kit for $7, but I fabricated a gasket out of the back of my notebook and sprayed some gasket spray and been working like a charm ever since.
SOURCE: I have a Craftsman 3 gallon 1HP air compressor
Sounds like the compressor has failed -- probably the valve -- tear down and rebuild is probably the solution, or replace compressor, or just buy another unit. My nature would be to tear it down and see what's going on.
SOURCE: air compressor air intake blows out hot air and wont build up psi
its either a reed valve broke or corroded beyond function.remove the head and look at the plates.look at the piston rings while your in there sounds like its just worn out,but i just rebuilt mine for 80 bucks thats all the gaskets plates and piston with sleeve.the repair takes about an hour.if you do tackle this yourself remember the fan for the air cooling may be reverse thread.try not to break it.noone mentioned this to me but i got lucky and tried the other way before i got serious about removing it.good luck
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