Perry,
you should be able to jerry rig up a shaft to see if your flywheel/ clutch assy is heavy on one side. I would be reluctant to have it balanced until it was checked first. Once the snow is melted you are welcome to compare your results with some extra flywheels/clutches I have here.
On aircraft engines the same crankshaft is uesed in 5, 7 and 9 cylinder engines and the only apparent difference is the size of the counter weight. Unfortunately I do not have a book telling the weights of each particular engine so don't know how it compares to tank engine....Bob
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