Question about Craftsman 3 gal. Air Compressor, 1.5 hp, Horizontal k

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Craftsman 1/3 hp compressor leaking oil

It still runs but doesn't hold pressure well.  Oil has leaked over the motor area.  I'm guessing the head gasket may need replacing.

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Most defintly you need a head gasket but you will also need piston rings look up your local sears service center not automotive or the store you want appliance service center

Posted on Jun 22, 2009

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Posted on Jan 02, 2017

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1 Answer

Leaking around Pressure Switch. Ordered & replaced switch but still leaking


Some pressure switches have a valve that reliefs the compressor head pressure when the motor stops and closes the head pressure relief valve when the motor runs.
There is a check valve that keeps air pressure from coming back to the compressor head and the relief valve.
I think the check valve is leaking tank pressure to the relief valve and compressor head.
The check valve is where the pressure switch mounts on to and it mounts threaded on to the compressor tank.
Try replacing the check valve

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2002town and country ac failed what could it be


Could be you have a slow leak and the safety low pressure switch has shut down your compressor so that it doesn't seize from lack of oil. Check all the refrigeration lines, the condenser (in front of the radiator) and the belt driven compressor for any signs of oil seepage. Do this with a good flashlight while the engine is cool and not running. If you don't see anything wrong, try having a can of 134 added and see if it runs at all. If it cycles off and on, you have a leak but if adding more charge gets it running, I would just run it and see how long it holds. These leaks can be a problem to find without dyes or leak detectors. Fixing the leak could be more trouble and money than its worth if you only need to add the stuff once a year.

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1 Answer

Craftsman Air Comp. 6 hp oil-less, 33 gal horz. tank - sounds really loud


Sources of noise from craftsman oil free compressors (could be Made by Campbell Hausfeld or Porter Cable) include loose fan, failing bearing/s on the piston rod and housing, failing seal ring on piston, air filter intake and loose motor mounts. With the housing cover off, check the fan blade for cracks or loose screw. Turn motor by hand till the piston is at top of stroke. Examine the cylinder for scratches close to top. If scratched, air is leaking past vinyl ring making noise and causing longer fill time. If everything looks ok, suspect noise coming from bearings. Hard to tell if bearings are failing by looking at them. I have seen many failures of the piston bearing on the crank (fairly easy to change, I use alternator bearing from auto parts ) , however, the bearing in the housing just behind the crank bearing is much harder to replacable. Good luck with your fix-it project.

Jun 11, 2012 | Craftsman Air Tools & Compressors

1 Answer

I recently purchased a 20 gal/1.5 HP, model 921.166420. The reset button on the side of the motor, (thermal overload Protector?) cuts out repeatedly. The few times where the motor did run and the pr


Could be weak thermal cutout or actual problem with unit. Thermal cut out easy to check with amp meter. Connect meter as required to monitor draw as unit fills and make sure that it stays at or below usage stated. If amp draw stays below stated usage and thermal cuts out, replace the part. If amp draw goes over amount stated turn off compressor and listen for air leaks (usually check valve will leak back pressure to pump causing extra load on motor).

Nov 29, 2011 | Craftsman 150 PSI Air Compressor

1 Answer

My craftsman air compressor #919176820 2 HP 12 gallon 200 max psi will not compress over 125 psi


If your compressor is oil-less type, most likely pressure is leaking past piston ring. To verify, remove cover to expose bottom of cylinder (unplug compressor and let out all air). With flashlight, examine the upper-most part of the cylinder (turn motor by hand till piston is at top of stroke). If top of cylinder is scratched, then pressure is leaking past.
For many years now, stores are in a race to have more HP and PSI to attract customers. Customer is really the loser because components used to make the units can not handle the higher pressure. Normally small 115v compressors are set to cut out at 125psi and larger two stage units will cut out at 160psi. Small compressor set to 200psi makes for short lived compressor. Could be compared to driving your car at 100mph all day every day. Longest life is attained when unit is being used at about 60 to 75 % of capacity.
To allow your compressor to reach cutout pressure and keep working for a while, lower cutout to 120psi (pressure switch may be adjustable). To restore to 200psi, replace cylinder/ ring.
If your compressor is oil type, suspect leaking reed valves.

Nov 27, 2011 | Ingersoll Air Tools & Compressors

1 Answer

3 Gal, Craftsman Air Compressor. Builds pressure to about 20 psi, no further. While it was running, it bogged down and sounded different. I felt around the entire compressor for any leak, but only found...


It sounds to me like the motor is shot, Bogging down at 20psi makes me suspect the brushes are gone. No good contact on the brushes or even just a bad connection of the power cord will cause it to heat up and lose power under load. Check for worn or lose power connection first, then see if the motor brushes are replaceable. The brushes would be under a screw type cap on the motor with a spring holding the actual brush in contact. You will have more than one so give it good look over.

Mar 04, 2011 | Craftsman 3 gal. Air Compressor, 1 hp,...

1 Answer

My Craftsman air compressor has wored fine till now. It does not want to build up pressure beyond 50 psi.yes I did check the drain valve and no leaks. Motor seems to be putting out the rpm's and the oil...


Check for a leak between you compressor head (pump) and your tank. Your pump output may be good but as your tank pressure gets higher the leak will not allow the tank to build up.

Feb 04, 2011 | Craftsman 1 hp Air Compressor, 4 gal. -...

1 Answer

Wont build pressure past 60 psi


If you have oil-less type of compressor you may be leaking pressure past cylinder/piston ring or just air leak. Easy to check. Spray soapy water on all connections, first with pressure in tank and motor shut off, then once again with motor running/pumping. Repair as needed. If no leaks remove cover to motor and move piston to top of cylinder and examine condition. If you see scratches neer top of cylinder, then pressure is leaking past vinyl ring. If cylinder looks shiny and smooth and piston vinyl seal looks intact, suspect problem with reed valves or head gaskets. Parts are avilable at sears parts on the web. Good holidays expensive.

Dec 14, 2010 | Craftsman 1 Hp, 4 Gal. Air Compressor

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