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Joe, looking at that key and the way that damper hub broke, I would say that is your cause of failure. You need not worry about a second seal, and you can apply silicone sealant to the key way to help seal it.
see how it has worn the key way slot by the crankshaft too? That is no good.
I would have to suggest metal fatigue over time has something to do with it. Everything has a service life and these engines being unbalanced and vibrating like a junkie stranded in Antarctica is hard on balancers.
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