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Compressor 921153101 will not go over 40 lbs pressure. 921153101 Craftsman Air compressor

I have the same problem as posted on 10/18/12 I checked the intake as suggested and found warm air pulsing. That suggests the piston rings are bad.
Are the rings available or do I have to buy the whole piston assembly?

Henri

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Air Compressors , Craftsman , Tools
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6 Answers from these members:
Mark T
Henri,






I am glad to hear you found the problem with the air compressor. The head gaskets on most models do not fail that often. I will be sure to add this to answers in the feature.






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Mark.
by Mark T Earned 1,607 community points in Craftsman
December 11th, 2012
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Here's an update on my issue.

I found it difficullt to accept my problem was the piston rings, or the valve reeds (after looking at them), Especially because I've really not used the comprseeor that much since I purchased it. As it turned out it was neither. The culpret was the head gasket. I did not see it earlier because the valve plate was stuck to the head gasket and in turn to the cylinder head. There was a rupture in the gasket where it seals the two head chambers. I replaced ithe gasket and problem solved. Suggest you add this to your recommendations for this problem.Henri
by Manage My Life
December 10th, 2012
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Mark T
Henri,






If you can keep air coming out of the outlet, the problem could be rings or reeds. If you have the head removed, you can place your hand over the top of the cylinder to seal it. Then turn the motor by hand. You should feel suction when the piston moves down and pressure when the piston moves up. If you do not feel this, I suspect there is a problem with the cylinder or rings. If the cylinder looks ok, I recommend replacing the piston kit. The kit comes with the connecting rod, rings, and piston. The rings are not offered by themselves.






I hope this is helpful. If you need further assistance, please reply below with more details.

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Mark.
by Mark T Earned 1,607 community points in Craftsman
December 2nd, 2012
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Mark
Thanks for the response.. I did take the head off, and could not see any visable damage to the reeds. I also disconnected the outlet tube and placed my thumb over the exhaust elbow. I found I was able to block the air from coming out. Does that confirm the reed issue or does it point more to the piston rings?
I'm ready to order the reeds, but want to be sure. If its the rings, can they be purchased without having to buy the entire piston assembly.
Thanks,
Henri
by Manage My Life
November 29th, 2012
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Mark T
Thank you for your question.

I am sorry you are having a problem with the air compressor. If you feel air coming out of the air intake, the problem is with the intake reed valve. The way the valve should work is when the piston moves down air is pulled through the intake reed. Then when the piston moves up the reed should seal and force the air through the exhaust reed. If the intake reed does not seal, you will feel air coming back out the intake when it is running. I recommend removing the pump head and inspecting the reeds. If they are bent, they should be replaced. The parts can be ordered from the following link.

Craftsman parts

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

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Mark T.
by Mark T Earned 1,607 community points in Craftsman
November 28th, 2012
Answered in 16 hours
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Replacing piston rings on an air compressor could be a challenge without the instructions. I did some research on your question & added the links below. Hope this helps!
by Manage My Life
November 28th, 2012
Answered in 11 hours
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