Question about Air Tools & Compressors
All air compressor will build pressure in the oil reservoir. This is caused by blow-by past the piston rings. The reason all compressors have this is due to the relatively slow rpm that the compressor crank is turning. Unlike a car's engine that is turning so fast the compressed gas doesn't have time to leak by the rings.
To deal with this problem air compressors have a special oil fill cap that alows the pressurized air to be vented out of the oil reservoir chamber.
There are three reasons that you are having this problem. The first is you have a clocked oil cap vent. Second is you have the wrong type of oil cap.
The third is the bad one. If the problem is unrelated to the oil cap then it means there is more blow-by then the vent cap can handle. This would indicate that you have worn or broken rings and/or worn cylinder wall.
If your compressor is not old (low hours), then take a close look at the cap. If it has more then 2000 hours then you will most likely need to rebuild the compressor, depending on the make and model.
Hope this helps and good luck.
Posted on Dec 14, 2009
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Posted on Jan 02, 2017
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