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I have a Porter Cable air compressor model CPLKC7080V2. Air leaks from the pressure switch and aftercooler safety valve and the pressure switch before the compressor reaches 80 lbs pressure. I replaced both the pressure switch and the aftercooler safety valve, and the new parts leak as well. Obviously not the right diagnosis on my part.

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I believe you have a head valve or piston ring problem. The parts you replace are suppose to leak. It is a safety feature that doesn't allow the motor to burn up before the pump warms up. Kind of like a soft start feature. If you look on the breakdown part number 107 Kit Valve Plate is what you need to inspect. Sounds like your valve plate is either worn or damaged. If you go into the pump you will have to get part 103 also which is a gasket kit. Or you can try to salvage the old gaskets.
If the valve plate is ok you will need to inspect the rings that go around the pistons. Some times you will get one that gets brittle and breaks off scarring the cylinder. Look for these two things, I am pretty sure one of them is the problem with your compressor.

Posted on Sep 08, 2009

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