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Tool Talk Discussion Forum

Air Compressor Problem ?

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pete7

11-11-2004 09:28:04

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When I drain my compressor tank I seem to get a lot more oil draining out than I would expect. But this is the first air compressor I've owned so I don't know what is normal. I 've also noticed that the oil level of the pump doen't seem to stay up at the full mark for very long. But, again I'm not sure if this is normal.
It's a CH 120 volt 5 horse single stage compressor with 135 max pressure and it's about 2 years old. How does oil get in the compressor tank anyhow? Bad rings on the pump??

Pete

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JoeK

11-11-2004 20:14:56

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Re: Air Compressor Problem ? in reply to pete7, 11-11-2004 09:28:04

A small amt of oil in the drainings is common in inexpensive compressors in my opinion.My 6hp CH will have maybe a teaspoon on monthly draining(limited but heavy use).I normally drain it into a round cake pan and let it separate to see whats there(oil/water/chips/tadpoles etc).Its hard to tell volumes when its all emulsified.Just my opinion.

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Roger P.

11-11-2004 16:16:09

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Re: Air Compressor Problem ? in reply to pete7, 11-11-2004 09:28:04

Some CH compressors use a small steel "star" type washer to hold in the wristpins. It is an interference fit, and sometimes they are not installed correctly at the factory, they break, or they are missing. This will allow the wristpin to migrate to one side and cut two deep ridges up the inside of the cylinder. Compressors with small teflon buttons in the end of the wristpins sometimes do this as well, if the buttons fall out and grind against the cylinder wall.

Alternately, you may have a broken reed which has punctured the top of the piston. Sometimes debris will get into the cylinder and crush the piston crown out near the edge and pinch the top ring into the groove.

Hopefully the rings are just worn. Compressors that are running too hard will pass oil when they overheat. Neglecting the air filters are a common cause of compressor ring wear, along with overheating.

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Vern-MI

11-11-2004 13:33:30

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Re: Air Compressor Problem ? in reply to pete7, 11-11-2004 09:28:04

Pete

There is only one way for the compreesor crankcase oil to get into the air tank and that is past the compressor pistons. That is to say either past the rings, through a cracked piston or through scouring marks on the cylinder walls. If still under warranty take it back. If not then open the compressor up and have a look to see what is worn or broken. Have you been changing the oil and using the correct compressor oil?

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pete7

11-11-2004 15:50:37

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Re: Air Compressor Problem ? in reply to Vern-MI, 11-11-2004 13:33:30

Thanks Vern-MI and VADAVE. I quess I'll have to open it up myself and see what the problem is since it isn't under warrenty any longer. I was always careful with the oil and used the special type for compressors so I don't think I did ( or not did) anything to cause this. The compressor never had hard use either. I'm a little surprised by this problem. I purposely stayed away from the oil-less type compressors because I thought oil type would be the longer lasting. Oh well maybe it will be cheap/easy to fix.

Pete

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VADAVE

11-11-2004 10:34:56

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Re: Air Compressor Problem ? in reply to pete7, 11-11-2004 09:28:04

I have the same compressor, about 8 years old. I do not have the problem you describe. Oil remains full and I am not getting any in the tank. Think you have a ring problem--maybe stuck?
There is no other way for the compressor oil to get into the tank.

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