[supposed to be a balancing deal. If the PP is off center the bearings wear? Our diesels don't even have a harmonic dampner IIRC so I don't know why it would be too bad. The bolts should center it for the most part anyway.
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The AAZ does have a Harmonic Balancer, as part of the serp belt system though, and I can see where having the locator notch, without the pin, could cause a very slight imbalance.