Most Cubs have a tube that runs from the front side of the engine block to the intake pipe of the air cleaner. It isn't unusual to find these tubes plugged. If your tractor has one, remove it and clean the tube out. Also run a wire or something similar into the engine block where the tube connects to make sure the opening isn't plugged. This may take care of your visible blowby.
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Today's Featured Article - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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