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It can cause a vibration at different RPMs. If it is wobbling around on the crankshaft it could cause damage to the crankshaft's snout. And a worst case scenario overtime a faulty balancer could break a crankshaft.

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Q: What will a bad harmonic balancer cause?
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A bad harmonic balancer can cause a knocking noise. The harmonic balancer doesn't actually produce the noise, but it can cause the noise in the engine.


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