My tensioner gave out a couple weeks ago on the highway causing my drive belt to slip off track and shred. I needed to get to work so I bit the bullet and had it towed to a shop. Shop did a nice job and great service on everything I asked them to do, but today when changing my oil pan gasket I saw that there was a bunch of the old belt that had gotten tangled through the spokes of the harmonic balancer and it didn't get removed. I emailed the shop with pictures to see what they say. do I need to push for them to ay least inspect it or replace it? Or since it wasn't tangled on anything else it probably didn't do any damage? I drove like this for a few weeks.

I would be careful with that kind of thing. I would have expected to cut that crap out of there though. On the backside of the harmonic balancer are a series of rings, with cutouts at specified intervals. These are for the crankshaft position sensor, which is back there as well. If one of those shreds more, moves, ect, it could tear up the sensor itself, or even worse, wiring to it.

What do you mean by that? Yeah I've had to replace my CPS before so I'm familiar with the system and consider it to be fairly fragile relative to the other systems in the vehicle, which is why I'm a bit concerned it was left there.

Actually, you addressed any concerns I had. I would either cut out the belt shreds, or get the shop to do it. I was trying to express my concern with how fragile the system is.

Got it. I've already removed the belt since I was down there anyway. I was referring to if I need to push the shop to inspect harmonic balancer / CPS system for damage since it was left in. I did not have the time or motivation to look at it very closely

You could try removing the belt. Likely they didn't see it and it'* worked it'* way out a little.