IH has a great explanation of the imbalance forces in a 4 cyl inline engine. I think it is in the C153 service manual, but not sure. Anyway, they go to great lengths to explain why they added the balancer shaft below crankshaft. It has to do with the fact that a piston moves a different distance in a specific degrees of crankshaft rotation at top dead center than that same piston does at bottom dead center. I have put dial indicators on pistons both top and bottom dead centers and turned crank same amount in degrees and you get a different reading. Try it sometime. Interesting.
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