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Craftsman Air Compressor won't build pressure and gets hot

I have the Craftsman air compressor 921.16680 and it will not build pressure past 20psi. It also gets hot around the copper tubing going to the tank. Air seems to be blowing out of the oil fill and sometimes the air intake filter. I've read the other questions and responses and tried to buy the parts suggested but the compression rings and scraper are not available anymore. That I find preposterous considering it is still sold new. How can you sell a product brand new to which parts are currently no in manufacture and are unavailable? I've seen the the reed valves and the associated plate can also be a possible cause of the problem. My question is: what is the likely cause considering the heat build up in the copper tubing? I've inspected the rings, scraper and the reed valves and to my untrained eye, they appear to be fine. My compressor is only 4 years old and I've put less than 10 hours of use on it. It still looks brand new, I really don't want to throw it away.

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Air Compressors , Craftsman , Tools
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5 Answers from these members:
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by Manage My Life
October 3rd, 2011
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Mark T
If the air is coming out of the intake, I suspect the reed valves are the problem. I recommend replacing the reeds, plates, and gasket. Any time the compressor is taken apart the gaskets should be replaced. I do not think you will need anything else.
by Mark T Earned 1,607 community points in Craftsman
October 3rd, 2011
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Manage My Life
Thanks. Air is blowing out of the air filter. So to fix this, I need a reed plate and two reed valves? Do I also need a gasket kit? Anything else?
Thanks again.
by Manage My Life
October 3rd, 2011
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Mark T
Thank you for your questions.

I am sorry you are having a problem with the air compressor. The tubing will get hot when it is running. If the pump is not working, the pipe will get hotter because it is running longer. When the compressor is running feel around the air intake. If you feel air, blowing out the problem is going to be in the valve plate. The air should only enter the intake and come out exhaust. If you do not feel air coming out of the intake, feel around the crankcase breather. If you feel air coming out of it, the problem is air is blowing past the piston. To repair this problem you will need to take the compressor apart and inspect the cylinder wall. If it is not scored up, I recommend replacing the piston kit. The kit will come with the piston and the rings. The part number for the kit is E100251 and can be ordered from our parts website:

Sears Parts Direct

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I hope this is helpful. Please let me know if you need further assistance.

If you do not feel confident repairing this problem yourself, then you can have it repaired by a Sears technician. Here is a link that will provide the nearest drop-off locations:

Sears Home Services

.

Thank you for using Manage my life.

Mark T.
by Mark T Earned 1,607 community points in Craftsman
October 2nd, 2011
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afritz afritz
Manage My Life is a great website to speak directly to an expert who can help you every step of the way to solving the problem you are having. An expert shall have an answer to your question within 24 to 48 hours. Have a great day.
by afritz afritz Earned 1,258 community points in Craftsman
September 30th, 2011
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