The BMW X5 Harmonic Balancer helps protect the crankshaft by absorbing torsional vibrations that would otherwise crack metal and shake the cabin. Mounted to the nose of the crankshaft, the Harmonic Balancer contains a steel hub, a thick inertia ring, and a rubber isolator that flexes to allow the inertia ring to twist in the opposite directions of the oscillations of the crankshaft, canceling the unwanted energy. Every BMW generation of the X5 retains this tri-layer design as an action to balance the mass of the pistons and rods and also steady the operation of component pulleys. If the rubber softens due to heat or chemicals on the road, the Harmonic Balancer loses its flexibility, vibrations increase, and serious crank damage may occur. Earlier versions of the X5 petrol and diesel models had a single groove pulley face, but later turbocharged versions applied multi-groove faces to power extra components. Both of these styles employ the same basic Harmonic Balancer construction with rubber bonded between metal surfaces. BMW suggests replacement once there are signs of cracks, glazing, or wobble because a new Harmonic Balancer means the idle will be smooth again, the bearings will be protected, and the belt alignment will remain true during spirited BMW X5 acceleration.
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