Derek Spudich

Why does my Craftsman Air Compressor stop building pressure at 30psi?

I own a Craftsman Upright 12 gal. tank, 1 HP Air Compressor (oil lubricated). Model number 921166400. I have had this for about 3 years now with no problems. I use it very sporadically, and it can go months at a time without any use at all. Yesterday, while the compressor was running, the sound of the compressor changed slightly, and it sounded like it started to run a little faster. After several minutes, I noticed that it was not shutting off and the tank would not build pressure past 30psi. I also noticed a slight burning smell, but unsure if that was related to the problem or just from the heat of the motor running longer than normal.

I have drained the tank completely and started the compressor again. It takes a 5-6 minutes (which is a long time to start with) to build to 30psi. It will keep running but will not build past that mark.

When the compressor is off, it will hold 30psi and no leaking is noticed anywhere.

So, whats wrong with my compressor??? Gaskets? check valve?

Thanks for your responses.

Air Compressors , Craftsman , Tools
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4 Answers from these members:
Derek Spudich
It was the head gasket! If someone has this problem, check this first. Follow the directions above. Very easy to get to for anyone that can turn a socket wrench. This has to be a very common problem, very thin area between the intake and exhaust ports where the gasket can (and in my case did) fail. Thank you very much!
by Derek Spudich
November 23rd, 2010
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