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Old 06-06-2010, 12:51 PM   #1
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Craftsman 3 gallon 1HP air compressor model #921.153101

Compressor was working fine & then pressure dropped, will only built 15lbs maximum now. No leaks or open valves .

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Old 02-13-2011, 10:51 AM   #2
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Craftsman 3 gallon 1HP air compressor model #921.153101

I just got thru working on my Craftsman 1hp and found a blown head gasket. Imade a new set of gaskets and glued them in with a shellac based gasket cement. After removing the head, there are 2 plates that hold the valve reeds,note the groves that hold them in,make sure they go back the same way. It was the top head gasket that went-there is a wall in the head that seperates the incoming air from the compressed air that needs to be sealed off by the gasket.Try this-it worked on mine

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