"Why would it come out? The piston moved from one end of the cylinder to the other and the oil went right past it. No oil has entered or exited the cylinder. What is going to push oil out the open port?"
Volume? The side of the piston with the rod has a lot less area in the cylinder bore than the side with no rod. Fill a cylinder with the rod extended, then lower it with the oil pushing past the piston and the top side won't be able to hold all the oil because of the space taken up by the rod. The excess oil will come out the top port.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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