Like the rod journal surface? That would be a big no-no....
Media blasting does remove metal. That's why it works. I am not familiar with that motor... does it use ball or tapered bearings on the mains? If so, and then fit snug, I'd say it's fine. Rod journal.... I'd at least polish it. I'm assuming that this thing isn't going to have a hard life.... You need to address it, but I don't think it will "kill" it.
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