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www.yourmechanic.com/article/symptoms-of-a-bad-or-failing...

The crankshaft harmonic balancer is a device connected to the front of an engine’s crankshaft, usually built into the crankshaft pulley. Its purpose is to absorb and reduce harmonic vibrations from the engine as the crankshaft rotates, as harmonic vibrations at high engine speeds can cause accelerated wear and damage to the components.

www.autoblog.com/2016/01/08/symptoms-of-a-bad-or-failing...

The crankshaft harmonic balancer is a device connected to the front of an engine’s crankshaft, usually built into the crankshaft pulley. Its purpose is to absorb and reduce harmonic vibrations ...

www.agcoauto.com/content/news/p2_articleid/273

Improper harmonic balancer service. Harmonic balancers are precision devices and improper service may easily damage them. They do not design the outer ring as a place to pull the harmonic balancer from the engine. Using a wheel puller to remove a balancer is a sure way to destroy it. Prying or beating on the balancer will also cause damage.

www.youtube.com/watch?v=KLKg3PXJqH8

At first I thought it was a bent pulley. I was kind of surprised when I saw the broken harmonic balancer. I'm lucky my crankshaft looks fine. I put a new balancer on it and the noise and wobble ...

www.reference.com/vehicles/symptoms-bad-harmonic-balancer...

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.

www.stangnet.com/.../threads/harmonic-balancer-wobbly.753721

The rubber on the stock balancers can crack causing the two sides of the balancer start to come apart, it will look like the balancer is wobbling with the engine running. In my case it looked slightly wobbly and caused minor vibrations at idle, but smoothed out with more RPM.

itstillruns.com/signs-bad-harmonic-balancer-7247989.html

The harmonic balancer is the unsung hero of your vehicle's engine. This component works with the camshaft sensor to keep engine components operating smoothly and belts running without slipping. The signs and symptoms of this component failing can be quite noisy. Without proper attention the problem can quickly ...

www.underhoodservice.com/harmonic-dampeners-fail-look

The other cure is a crankshaft pulley with a harmonic dampener/balancer. A harmonic balancer is like a punching bag for the crankshaft. There are two basic components in a harmonic balancer: inertial mass and an energy-dissipating element.

spendonauto.com/harmonic-balancer-replacement-cost

The following is a list of symptoms which indicate a bad harmonic balancer for car users to watch out for: Deterioration – Visible signs of deterioration are some of the most obvious symptoms of a failing harmonic balancer. The outer ring or balancer hub might be cracked or warped.

www.youtube.com/watch?v=vM-bz_oBuus

MotorWeek's Pat Goss & RockAuto.com's Tom Taylor discuss what harmonic balancers do and how they sometimes fail.