A knocking noise from the engine is the main symptom of a bad harmonic balancer. A squeaking noise is another symptom of a bad balancer.
When dealing with a bad harmonic balancer, getting it fixed as soon as possible is vital for car owners, since it can cause the engine catastrophic damage. If the outer ring on the harmonic balancer comes loose, it can cause damage to the water pump and other components. A mechanic can properly diagnose the problem. Failure to maintain the vehicle with oil changes is one cause of the harmonic balancer failing. Improper repair service can also damage the component.