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Craftsman Air compressormodel #921153101

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Air compressor will not build pressure

compressor model 921.153101 will not build pressure have had apart and don't see any faults. it is getting compression in the crankcase and bleeding out of the oil fill vent. The rings look ok. could it bee the reed valves weak? Thanks for your help in advance. Warren

Posted February 09, 2013


Alina, February 09, 2013

Managemylife.com is always a great resource to find the answers to just about anything. Your expert will research your question and respond within two business days but usually sooner.

Mark T , February 10, 2013

Thank you for your question.  I am sorry you are having a problem with your air compressor. I looked up the model number you submitted. According to the parts list the only way the crankcase can be getting pressurized is from blow by. This happens when the piston rings do not seal against the cylinder walls. As the piston moves up, the air should be forced out the cylinder through the exhaust port. If the rings are not sealing the air gets pushed past the ring and cylinder walls. I recommend checking the rings and cylinder again. If the rings are not broken, check the cylinder for out of round. If looks ok I would recommend replacing the rings and honing the cylinder. When installing the rings. Be sure gaps in the rings are turned 180 degrees from each other.    I hope this is helpful. Please let me know if you need further assistance.  Thank you for using Manage my life.Mark


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