A system for determining acceptability of torsional dampers for service in a machine system includes a fixture, an ultrasonic scanner and an indicating device configured to indicate at least one of acceptability and unacceptability of a torsional damper based upon receipt of a signal from the scanner. A nondestructive testing method for a torsional vibration damper includes scanning a torsional vibration damper with ultrasonic energy, and determining a test value for the damper indicative of a viscosity of fluid sealed within a housing of the damper based on receiving transmitted ultrasonic energy. Receipt of ultrasonic energy may be used to determine the flow rate of fluid within the damper by indicating a time for fluid to flow to fill a void within the damper. The system and method may be implemented in a remanufacturing or salvaging process for torsional vibration dampers.