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I wouldn't think engine mounts would have any appreciable effect on bearing life for a belt pulley bearing. If that were the case, we'd see way more bearing failures. I understand the logic, I just think its a stretch. From what I've seen, I'd chalk it up to a bad bearing from the factory, or something faulty to do with the initial install finally reared its head after so many miles. Maybe the pulley was dropped and pitted a race, or it didn't have sufficient lube, who knows.
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