The harmonic balancer is actually two separate pieces. The inside core is attached to the outer hub by a layer or rubber or plastic. Take a close look and see if the two pieces are still intact... They need to act as if they are one piece ... If you see any play or movement between the two pieces, then you will have to find another one ... could cause vibration of some sort when you get the engine going. ... If you do find a problem with the balancer ... I suspect that it was caused by somebody using an inappropriate method of loosening the center bolt ... to try to remove it.
