Trucking delivers the global economy to our local stores.  To reliably accomplish this demanding task, nearly all heavy duty truck diesel engines come equipped with a viscous style harmonic balancer (crankshaft damper) using Vibratech TVD technologies.  Due to the high levels and extended periods of crankshaft torsional vibration, Vibratech TVD recommends harmonic dampers on over-the-road heavy duty diesel trucks be replaced according to OEM service intervals, every 500k miles, or during in-frame rebuilds and overhauls.  Whichever occurs first.  Although the silicone found in a viscous damper is the best known damping material, it too will gradually harden after the recommended service interval and begin to lose its ability to provide optimum real-time, self-tuning damping across the rpm range.

Rebuilding a diesel engine without replacing the damper will greatly reduce the life expectancy of the rebuild and can lead to possible crankshaft failure.