Model #919167802 CRAFTSMAN Air compressor

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  • Pump Assy
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Question and Answers

Q:

air compressor oil leak

A:

An oil and air leak can be an inconvenience and cause some concern. I did some research and I was able to find a link with a similar question. I hope this helps with the oil leak problem, while you wait for your expert response.

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Joseph P. -
June 27, 2012
A:

Hello Brian,

I'm sorry to hear that you are having problems with your air compressor and I would like to assist you. I verified that the ABP-5950057 gasket kit is correct. I would assume that there is some debris stopping the plate from sealing correctly on the crankcase. There is a more pressing issue of the air coming out of the dipstick vent. This is indicative of the pistons not sealing within the cylinders. The rings are replaceable, but the cylinders will also need to be honed, much like a conventional engine.

I checked on parts for your air compressor and found that the high pressure rings are not available. Unfortunately, it may not be economical for you to attempt to rebuild this unit. There is a high likelihood that the cause for the seal initially failing is the escaping pressure from one of the cylinders.

Please let me know if there is anything further that I may assist you with.

Jerry C

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Jerry C -
Sears Technician
June 27, 2012
A:

My main concern is that the replacement pan gasket is clearly thinner than the original gasket that was removed from the compressor. Can you provide the specs of the pan gasket in kit # ABP-5950057 so I can be certain mine is in tollerance? I have noticed some air escaping the dipstick vent for some time, but it was sitll pumping up fully and did not seem to have any loss of performance. Thank you.

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Brian -
July 03, 2012
A:

Hello Brian,

It is common for gasket material to swell and become thicker after aging, than it is when new. With the air that is getting into the crankcase by the lost compression from the pistons, the pump is going to blow out seals continuously, as long as there is excessive crankcase pressure. Yes, the pump can still run and still produce pressure, but now there is the issue of seals constantly leaking. I assume that it took a while for the original seal to blow out or start leaking because it had become brittle and stuck to the sealing surface. Another thing that you may want to check is the flatness of the sealing surface of the bottom cover where you are seeing the leak. Use a quality straight edge and check the cover. Flip the straight edge over and re-check. The cover is probably warped and that is also causing issue. The cover is not designed to stop the pressure that is being exerted on it by the excessive blow-by.

I'm not trying to discourage you from attempting to repair this pump, I just want to convey the issues that will have to be overcome.

Please let me know if there is anything further that I can assist you with.

Jerry C

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Jerry C -
Sears Technician
July 03, 2012
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Q:

Craftsman Air Compressor 919.167802 pressure switch leaking air at check valve

A:

I understand that you are leaking air from your Craftsman air compressor. I have taken some time to research your question here on the Manage My Life website and I noticed that someone else had asked a similar question with a posted response from an expert. I attached the link below for you to view. I hope the link that I provided is helpful. Have a nice day.

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Dezeray S -
March 28, 2012
A:

Thank you for your question.

I am sorry you are having a problem with the air compressor. The valve on the side of the pressure switch is a relief valve. When the pressure switch turns the motor off it activates a lever that pushes on the relief to bleed off the pressure on the pump and lines. It should leak out for a few seconds. If it is leaking longer than that, the problem is the check valve in the tank. The check valve is a one-way valve that allows air to enter the tank but not come out. If the check valve is dirty, the air will leak back out of the tank through the relief valve. I have posted an image below that shows how to clean the check valve. If cleaning the check valve does not cure the problem, you need to replace the check valve.

Please be sure to unplug and drain the air out before attempting any repair.

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.

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Mark T -
Sears Technician
March 30, 2012
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Q:

Why is my NEW pressure switch assembly leaking? 80 compressor model 919167802

A:

It could be difficult to find a solution to your leaking problem on an air compressor. This seems to be a common yet frustrating problem for air compressor owners. I have provided you with three very helpful links that may help you figure out where the leak is coming from. I attached all links below. I hope this helps!

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Jacqueline S -
November 19, 2010
A:

The check valve on your compressor is causing this problem. It is not stopping when it should and it's letting pressure pass back into the tube and leak out at the pressure switch assembly.

We see this fairly often and it's often mistaken as being an issue with the pressure switch because of the way everything is plumbed in. The check valve is key 39 on the parts image, part number is A19715.

Swap that out and your compressor problem should be taken care of. You can order the check valve HERE if you'd like.

Thank you for using Manage My Life!

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XX Wade_ -
Sears Technician
November 19, 2010
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