Model #921166380 Craftsman air compressor

  • Air Compressor
    3 Results

Question and Answers

Q:

Looking for source for piston rings for a Craftsman 921166380 compressor.

A:

Thank you for your question on the rings for the air compressor.

I am sorry but they only provide the rings with the piston and eccentric as one assembly.

I will give you a link for the parts below.

Piston ring kit for model 921.166380 .

I hope this will help.

Sam A.

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Sam A -
Sears Technician
November 13, 2012
Q:

compressor oil amount

A:

Thank you for your question.

I will be happy to assist you. I looked up the model number you submitted. This model requires 3 ounces of SAE30 motor oil. I also included all the specifications for this model in the image below. Just click on the image to enlarge it.

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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Mark T -
Sears Technician
May 24, 2012
Q:

Craftsman air compressor #921166380 will not build pressure past 25 psi. This is what I have done so far:

A:

Thank you for your question.

I am sorry you are having a problem with the compressor. With what you have already checked I suspect air compressor probably has something broken inside the cylinder. Disconnect the power to the air compressor and remove the plastic cover around the motor and compressor.

Before you take the compressor apart, listen and feel for air leaks. Check to see if air is coming back out of the intake filter. If air is coming back out of the intake filter, something is wrong inside the cylinder.

You can see a parts diagram at [www.searspartsdirect.com]. The parts diagram will help you locate the parts that build air pressure. These are the parts you need to inspect.

Turn the motor shaft by hand and be sure the piston goes up and down.

If the piston is ok remove the 4 screws holding the head on top of the cylinder. Remove the head.

Directly under the head is the pressure plate. The pressure plate has reeds on it that direct the air into the discharge line and keep the air from going back through the intake side of the compressor. Check the reeds for warping or breaking. If the reeds are damaged, you must replace the pressure plate. Make note of how the pressure plate sets and the o-rings that seal around it.

Remove the pressure plate and inspect the cylinder walls for scratches or wear, if the cylinder is damaged you need to replace the cylinder, piston, and rings. Make note of the piston and the rings on it. If a ring is worn or broken the air goes back through the intake filter and no pressure is built. If you have to replace the rings, replace the piston and sleeve also.

To replace the rings and piston, you have to remove the nuts that hold the piston to the eccentric.

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 .

Here is a link to order any parts you need. Sears Parts Direct .

Please let me know if you need further assistance.

Thank you for using Manage My Life!

Mark T.

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Mark T -
Sears Technician
May 19, 2011

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