Accessory drive or harmonic balancer?

[6.2man]

I have asked the question and read many post here about changing the harmonic balancer on my high miler 93 6.2 C series motor. I spoke yesterday with our local reputable diesel shop and he indicated that he had not experienced any problems with the harmonic balancer, however, he thought I should change out the serpentine accessory drive pulley just ahead of the balancer. Any ideas-does your experience validate that idea? TIA P.S. I have had no abnormal belt wear or any problems with alighnment or throwing off of the serpentine belt

[britannic]

Carefully inspect the rubber bonding in the balancer and the pulley for cracks, missing chunks etc., any evidence of such will necessitate replacement.

[arveetek]

I would replace both. Either one can lead to a broken crankshaft. Broken crankshafts have occurred on engines without the rubber-isolated puelleys as well.

Casey