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

The natural enemy of the harmonic dampener is oil and other fluids. A leaking crankshaft seal can coat the rubber or elastomeric parts of the dampener and cause it to deteriorate. Also, items like leaking valve covers, power steering pumps and A/C compressor oil can cause the rubber to swell, shrink or crack.

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

An often overlooked part of an engine is the harmonic balancer. Failure in the harmonic balancer can be as simple as a squeaking noise or as catastrophic as an engine failure. Proper service procedures and learning to spot symptoms helps prevent most problems the harmonic balancer may cause. The purposes of the harmonic balancer

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.

community.cartalk.com/t/can-a-bad-transmission-replacement...

How likely is it that a badly done transmission job could have caused the harmonic balancer to fail ? After the transmission replacement the car “felt” like it was running fine. Or @200K miles, is the harmonic balancer failure just bad luck ? ...

www.gatestechzone.com/.../tvd-failure-signs

So, replacement is required when the harmonic balancer is no longer able to provide reduction of vibrations due to wear. Furthermore, when a torsional vibration damper has reached the end of its service life Gates recommends that all wear parts are replaced at the same time to ensure the best long-term solution.

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

Symptoms of a Bad or Failing Crankshaft Harmonic Balancer. ... If the rubber layer in the harmonic balancer dries or wears out, it can cause the entire harmonic balancer to completely fail by ...

mechanicbase.com/engine/crankshaft-harmonic-balancer-symptoms

You will also see cracks on the balancer hub or the outer ring if the pressure from the harmonic balancer is too much. Check Belts. The crankshaft harmonic balancer is connected to a timing belt. So, to check the harmonic balancer’s failure you need to first take a look at the various belts of your engine.

www.fixya.com/cars/t27287462-harmonic_balancer_crankshaft_pulley

What causes Harmonic Balancer failure? There are a variety of possible causes for balancer failure. Most common among these are heat stress, wear from road salt, oil leak, or ozone attacking the rubber components, damage inflicted by road debris, crankshaft failure, stress from integrated drive pulleys, and stress caused by loads from other ...

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 ...