turbovair
08-22-2003, 01:28
1996 6.5 TD vin "F" 112,000 miles
Wanted to share this with all.....
Symptom:
rattling, light/moderate knocking sounds coming from front of engine at idle;goes away with light throttle input. Vibration felt in cab at idle, smoothes out with power application.Knocking noise noted at engine shutdown. Noise disappears when serpentine belt removed.
Cause:
crankshaft pulley(not balancer) rubber shredded causing looseness of outer pulley ring in relation to inner hub. Both parts rattle against one another "metal to metal" during operation.
Solution: replaced pulley with GM part. $225 @ local dealer.Replacement time 30 minutes.
Wanted to share this with all.....
Symptom:
rattling, light/moderate knocking sounds coming from front of engine at idle;goes away with light throttle input. Vibration felt in cab at idle, smoothes out with power application.Knocking noise noted at engine shutdown. Noise disappears when serpentine belt removed.
Cause:
crankshaft pulley(not balancer) rubber shredded causing looseness of outer pulley ring in relation to inner hub. Both parts rattle against one another "metal to metal" during operation.
Solution: replaced pulley with GM part. $225 @ local dealer.Replacement time 30 minutes.