The rubber bond in the harmonic balancer can decay, which causes the balancer to move and work its way toward the timing cover. If the balancer comes into contact with the timing cover while the engine is running, it will fracture and damage the cover and potentially other surrounding parts. The harmonic balancer should be inspected at every service.
Harmonic Balancer May Fail and Damage Timing Cover on Mercedes-Benz CL500
Average mileage: 109,000 (109,000–109,000)
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had vibration from front of vehicle at specific rpms only. Replaced harmonic balancer and problem is fixed, requires special tool to counter hold pulley when removing and installing