Chevrolet/GMC 6.5L Harmonic Balancer Pulley
AC Delco Factory GM Replacement Balancer Pulley for the 1993-2000 6.5 Turbo Diesel Trucks.
This is the harmonic balancer pulley for the 6.5L engines. It sits on the front of the harmonic balancer and is usually the culprit behind an engine with a rod-knock type of sound. If you think your might be bad, shine a flashlight down at the four ""spokes"" on the center of the pulley and look for shiny spots where the bolts have been colliding with them. At the same time, if the bolts are not evenly spaced in-between the spokes, its time to replace the pulley.