Crank pulley damper ring came off...

While changing a filter on my JD 790E hoe with the JD 6068 engine, I found the rubber mounted damper ring from the crank pulley had spun off at some point. I haven't noticed any vibration and I have many farm tractors that don't have this ring. Not to be cheap, but as this is going to be a major teardown and expense to replace, how necessary is the ring and will I run the risk of engine damage if I don't replace the pulley/damper assembly soon or at all?

Crank pulley damper ring came off...