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Getting gas in the oil in my smith air compressor has a wiscosin engine

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This is usually a carburetor problem. The float needle is not seating, or worn badly. It possibly just needs cleaning. Also, what would help is to put a shutoff valve in the fuel supply line if possible. That will keep fuel from weeping in the carburetor and getting into the engine.

Posted on Nov 15, 2010


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My makita mac2400 takes forever to make pressure

I have read both your questions and after taking both into consideration it sounds like it needs new piston rings. On a gas engine it is called blow by but both have a piston with rings on them, as they wear the end gap gets bigger and bigger allowing compressed air to bypass the rings into the crankcase where the oil is, the breather is there to allow air from the room to enter and exit as the piston goes up and down to avoid pressure or vacuum in the crankcase, the air on the top side of the piston is supposed to go into the tank but in your case some of it is going around the piston rings and into the crankcase building pressure and blowing oil out. There is not much inside a compressor like a gas engine, taking the head off and the oil pan should let you take off the connecting rod bolts and push the pistons out the top. This answer is based on the two comments of cant build all the air pressor and it is blowing oil out the crankcase breather. If you hit the 80 psi and unplug the compressor can you hear air coming from the limit switch box that the power cord goes into ? I will wait for your answer to continue.

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2 Answers

What grade of oil do air compessors use

iso 32 // 30wt. compressor oil, or no additive mineral oil, never use automotive oil in a air compressor

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1 Answer

We have a 2004 XAS 136 rotary screw compressor. The problem started suddenly. Engine starts and runs fine. On activating compressor, (blue button) there is a bit of exhaust smoke and engine seems overload....

First check oil level in both the engine AND the compressor if it has an oil sump.
It ounds like the piston rings or cylinders are scored causing the engine to have no power under load and to burn oil, and the compressor may also be seized.

if there is the correct amount of oil in the engine then consider an oil change and add some
Ametech Engine Restorer Oil Additive
www americantechnology co uk
to both engine oil and the compressor oil (providing it also uses ordinary engine oil too)

Oct 10, 2013 | Air Tools & Compressors

1 Answer

What oil do i put in a compressor (I have a Stanley 50 liter unit) ?

Compressor oil is different than engine oil. Compressor oil can be found in places like Harbor Freight or any place that sells air compressors

Aug 25, 2013 | Stanley Air Tools & Compressors

1 Answer

Replace oil sending unit on gas air compressor

If it was running it probably is still the oil level switch not reading the oil level in the sump. Recheck the unit.

Jan 27, 2013 | Jenny Products Air Compressor K5hga-17p,...

1 Answer

5 gallon compressor tries to start then stops

it sounds like the unloader is not working so it's trying to start with to much head pressure. One cause is a bad check valve another is a bad pressure switch. Those are the more common problems.

Jan 04, 2013 | AO Smith 2 Hp Spl 3450rpm M56 Frame...

1 Answer

I have a SMITH aircompressor with a 460 7.5L engine it around a 1980 year model the carb needs to be rebuilt where can i get a rebuilt kit for it?

I worked for a tool rental company while attending college and learned a great deal about engine /compressor combinations. AOSmith compressors used mainly ford engines to power their reed valve compressor head. The mechanic would use off the shelf carbs from local auto parts store. I would recommend that you remove the carb looking for an id tag or numbers stamped on the carb body to cross refrence it for rebuild kit or just exchange. The carb will not be for a 460 engine however. Since 1/2 of the engine is used for pumping air, the carb will be for an engine of lower displacement. We also rented a brand called Lindsay that used a Chrysler eight cylinder engine with their own design of reed valve head. These compressors would work pretty well untill the reeds started leaking, causing the engine to labor. Easy test, with engine off apply compressed air to discharge port (100psi), with cover removed from compressor head, listen for air escaping past reeds. Repair as needed.

Mar 29, 2011 | AO Smith Air Tools & Compressors

1 Answer

Hitachi Gas Air Compressor just stops running

The problem that you describe could be fuel lock due to failure of vent system in gas cap. Easy to check; leave gas cap loose run engine as normal. If problem gone, replace cap with new vented cap. The newer gas caps (California caps) have much smaller vent holes that seem to clog when moving the compressor at too steep of angle causing gas to enter cap choking vent. Temp fix would be to cut small piece from rubber gasket large enough to let air to enter tank. Good luck with your repair.

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1 Answer

Need a point setting for ao smith air compressor ac motor model number opa-0297 s# c56b72b2316508j2 work on air machine with motor installed motor will hum and trip breaker can we set points to stop trip...

There is not a point setting for air compressors. The pressure switch can be adjusted. Remove the cover from the pressure switch. Adjust the nut tighter for a higher cut off pressure or looser for a lower cut off pressure. It sounds like the compressor is trying tostart under load. If the unloader valve is not working, the compressor will draw excess amperage and do what you describe. The unloader valve releases the pressure in the cylinder at the end of the run cycle so the compressor can start the next run cycle under no load.

May 14, 2010 | AO Smith 2 Hp Spl 3450rpm M56 Frame...

1 Answer

Air compressor/ alot of air is coming out of the oil cap vent.

this could be blow back possibly bad piston rings you may need new rings oil chamber is usually at intake pressure unit may need rebuild

Jan 13, 2009 | AO Smith 2 Hp Spl 3450rpm M56 Frame...

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