Fatigue, that's the reason for a new rod. I was always told never put in a used rod. I've used aftermarket parts from 2 of the main sellers, no problems. My guy machined a new aftermarket rod for $25 + bearing $17. Been a few years and that was for a 16hp 4000 rpm puller. Some 16 or 18 hp singles had rods stamped Alcoa, those are the good ones. Mike
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