Parts guy in Tulsa said to check the alternator pulley before blaming the belt, and he was right

Claire Gibson · 2026-10-07T13:15:03.504943+00:00

Squealing on a 6.7 Cummins turned out to be a worn pulley letting the belt ride 2mm off center instead of a bad tensioner. Anybody else got a quick check like that for chasing belt noise?

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Parts guy in Tulsa said to check the alternator pulley before blaming the belt, and he was right | Diesel Mechanics - Topic Shares