I did an experiment with the "bad" date coded impellers vs an older one. I was able to separate the hub from the vanes easily on the bad date code impellers. On the older date coded impellers, I wasnt able to successfully get them to separate. I really think it's a manufacturing problem. Since the older impellers aren't failing, I have one older impeller in another pump that has a leaking shaft seal and that one has worked flawlessly. Just need to replace the shaft seal, but I don't want to until I can get a different date coded impeller.
I glued up a bad date code impeller with some gflex epoxy and will try running that one if this most recent impeller fails. I've tried different pumps, gone through the heat exchangers, engine temp is fine etc.
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