Model #919156730 CRAFTSMAN Air compressor

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broken muffler 919156730 Craftsman Air compressor


Thanks for the inquiry and for being a valued member.

I am sorry to hear of the damaged muffler on the air compressor. I know how frustrating that is to have happen.

In order to replace the muffler, you will need to follow the installation instructions below:

1) Release all air pressure from air tank and unplug outfit.

2) Remove shroud.

3) Remove head bolts by turning counterclockwise.

4) Remove compressor head.  It may be necessary to loosen head by gently prying with a flat bladed screwdriver.

5) Scrape any remains of gasket material from the valve plate with a putty knife.  
Take care not to bend flapper valves or damage valve plate surfaces.  
Be sure to remove all gasket shavings from valve areas.

6) Place U-shaped part of intake muffler into U-shaped hole that is cut into the head.

7) Re-assemble in reverse order. 

Assure that O-ring seals are seated in the valve plate grooves on both sides of the valve plate.
If needed a little bit of Vaseline can be used to help keep the O-rings in place during reassembly. 
Align the gasket, intake muffler and valve plate and tighten the head bolts to 7-10 ft. lbs. 
If either of the O-rings are damaged you should replace the damaged O-rings with new O-rings.
8) For older units with the gasket between the head and valve plate you may need to replace the gasket with a new gasket part # CAC-1175.

I hope this helps and thanks for using We appreciate your business.  

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Jeff Wallace Sr -
Sears Technician
January 11, 2015

air leak on air compressor


I understand how frustrating it can be when you have a constant leak on something as handy as a 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 have provided you is useful.

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Alina F. -
December 02, 2010

Thank you for your question.

I can understand how the leaking of air on the pressure relief can be a concern.

If some cases if you did not cut the old pressure relief pipe off and used the new nut and ferrule on the new pressure switch it could be the cause for the leaking.

On some models I have seen that the check valve on the tank where the pressure relief tubing starts from is bad. It bleeds air back from the tank to the pressure switch, instead of just unloading the tubing from the compressor head.

The problem could be the tank check valve and not the pressure relief unloader on the switch.

I have seen though it is rare that the new switches could be out of calibration with the lever being too close to the relief valve pin.

If this is the case I would suggest that you reform the tab lever to not put pressure on the relief valve pin during run time of the compressor.

I hope this will help.

Thank you for using Manage My Life.

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Sam A -
Sears Technician
December 02, 2010
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