Engine noise at idle. Has anyone heard this before?

[my mostly 36 coupe]

I removed the fan belt and the random "ching" noise that was more pronounced at low idle was completely gone. So I figure somewhere in the water pumps or generator bearings, fan blade. With the belt removed (and engine off ) I tried to wobble the bearings by hand but they seem the same and without noticeable play. Thanks, Tom

You can hear this at the link below.

https://vimeo.com/159570099