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Smoking air compresser

I have a 7 hp. 150 psi. max craftsman professional air compresser, after using it for a while it starts smoking and oil soaks the filter after the fresh air filter. It soaks the top of the head also. Is the oil to thin ? It Runs good, what kind of oil should I be using ? The recomended sears oil dose not seam to be doing the trick, I think its to thin. I didnt over fill it, but it seams to be getting by the valves. This is the second one thats doing the same thing. Do I have a good back up under the work bench. It has a 60 gal.tank, and 240 volt motor.

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  • Anonymous Jan 30, 2009

    the compresser motor has about 20 hrs. on it, I dont think its blow -by or rings, or valves. the first one ran for about the same amount of time and did the same thing, but it was over 1 yr. old so for 174 bucks I just bought a new compresser unit. the reason I Think its a oil problem, is they use 30 weight oil. Is that to thin? I took the head off of the first one and other than some black stuff on them feeler gauge looking valves everythlng looked fine. It runs fine, dont knock or anything,but oil seams to make its way up to the intake side of the jug, should I try some gear lube? whats the recomended oil for the crankcase?

  • Rick Wymer
    Rick Wymer May 11, 2010

    Can you be more specific on the Model? Do you have a Model #?? "Sounds" Like you Have Internal Compressor Problems here, don't think Oil is the Problem. You are experiencing "Blow-By", Bad Piston Rings, or Valve Guides.

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I use valvoline sae30, and mine doesn;t smoke,
are the rings ok, ie does it bulid up to full pressure in normal time?
just one other thing, these have to be kept level, or they will smoke.

Posted on Jan 30, 2009

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Mike:

If you have air blowing out of the oil filler cap, I would suspect that the piston rings are shot. The piston rings are supposed to keep the compressed air above the piston, and air seems to be leaking past the piston rings into the crank case.

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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.
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hi,
one thing that would be worth checking is the pressure release valve which is usually located on the bottom of the unit. This valve is suppose to be used each time the unit is turned off. For obvious safety reasons you should release the pressure from the tank each time you are done using it. If this valve is leaking or was left open then you will not be able to achieve the desired full pressure. Just checking if this is tight may be your solution! Hope this helps!

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