ALL engines have some blow by not matter how old or new but the new car engines take that blow by and runs it into the air in take and then burns it off. That cub does not have the burn off part to it so you see the blow by. Yes if way to much it can mean your rings are not sealing like they should and could cause a problem. One way to maybe help slow the blow by down some is to run a mix of atf and gas 1 qt ATF to 5 gal of gas. That helps free up sticking rings and cleans the upper part of the engine
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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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