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Bearing wouldnt make a knocking sound. Ive had a timing belt slip teeth on me. It definetly sounds like his problem. You start hearing the knocking (or logging it every time you step on the gas to get up to 0 vaccuum.)
It eventually get so bad that the teeth keep skipping and pistons hit the valves. Startup is the worst because of the sudden force on the TBelt.
If the balace shaft is off, you will definetly know as there will be ALOT of vibration.
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