^ Nope, it's a consistent, repetitive failure on certain engines and has nothing to do with abuse. There is no way to abuse a vehicle to make it happen, should've been a lifetime part but is poorly engineered. It should not have to depend on an extra strong hardened fastener, is simply not engaging good and too small a diameter (hence this topic exists, it is a known issue).
The choices are try to find a hardened bolt, which wasn't enough by itself for many owners, grinding the end of the bolt down and putting a nut and lock washer or threadlock on to try to compensate for the worn out threads in the plate where the bolt wobbles, OR the level 3 fix is drill and tap a larger hole for a 10mm bolt which then needs a pulley with a larger inner diameter bearing, for a 10mm bolt instead of 8mm. For example Duralast Idler Pulley 231165 has a 10.15mm I.D. to fit a 10mm bolt.
Last edited by Dave9; 01/19/20 08:19 PM.