Damper Support

The METALDYNE viscous damper has a design / operating principle of using a high viscosity silicone fluid to generate damping torque by shearing the thin film of fluid surrounding the inertia ring mass (flywheel). As the engine speed changes to a point where torsional vibration is present, the crankshaft (and hence the damper casing because of its attachment to the crankshaft) are subject to torsional oscillation superimposed on the mean rotation. Because of its inertia, the flywheel (within the casing) will continue to rotate at a more uniform velocity so that there is an oscillating relative movement between the flywheel and casing.Therefore, when torsional vibration is present, the fluid undergoes a shearing action absorbing vibration energy which is dissipated as heat.The high viscosity silicone fluid within the damper casing will, after constant heat absorption during its service life, reduce in viscosity value and because of this, sampling plugs are fitted into the cover plate and / or back face of the casing so that samples of fluid can be extracted for analysis to determine the condition of the damper.From this fluid analysis, the internal mechanical condition and operating efficiency of the damper can be established, and METALDYNE will recommend the service period the damper can be used before a further sample of fluid must be taken. If the reduction in fluid viscosity is excessive, or the condition of the fluid indicates internal mechanical damage, the remaining safe service period before overhaul of the damper becomes absolutely necessary will be advised.