Patrick: Some of the things that cause this after an overhaul are oil thickness and plugged up filter on your oil filter cap. One of the reasons you are seeing this is because your pistons are building up compression when they are on their way down. The crankcase needs to be ventilated. When you get the proper ventilation, your oil will not be forced out of the oil cap. I would be worrying more about pressure being built up in the crankcase and creating seal leaks. So don"t really try to block off this pressure. Try a bigger vent on your oil filter. Get the kind that traps the oil and only releases the air pressure.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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