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 - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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