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Faunsdale, AL | The top one may be a simple crankcase vent and the lower one in the elbow may be the vent for the unloader. Possible the valve seats in the elbow when the compressor spins up and releases as the compressor slows down and stops.
The check valve is in the top of the tank itself. Like Greasemonkey says, follow the small copper line from the elbow down to the tank and it will screw into the check valve fitting. Or at least a lot of them do.
Lots of places for oil to seep out of gaskets and seals, but if not excessive, you can put up with some grungy buildup I guess. If you cannot keep the oil sump full, then you probably need to fix it before the compressor locks up or throws a rod. Oil may also be from the rings on the piston(s) being worn out. When you drain the tank, do you get a lot of oily water or just mostly water? | |
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Help with old air compressor (Pics)
