What is a crankshaft harmonic balancer?
The crankshaft harmonic balancer—also known as a vibration damper—is a vital engine component designed to reduce harmonic vibrations and prevent damage.
Picture this: The explosions of fuel and air that power your car’s internal combustion engine create vibrations and torsional force on the crankshaft. Those vibrations can cause damage to internal components and throw off the engine timing. For these reasons, a crankshaft harmonic balancer is necessary.
The harmonic balancer attaches to the front of the crankshaft and is composed of a metal hub, a rubber damper, and a balance ring.
It connects to the crankshaft via the metal hub, while the rubber damper absorbs shocks and vibrations. The balance ring usually functions as the crankshaft pulley, powering engine accessories like the water pump, alternator, and AC compressor.
When should I replace the crankshaft harmonic balancer on my car?
The most common signs of a bad crankshaft harmonic include:
Visible damage: You may notice visible cracks or damage to balance when you inspect the part. If your harmonic balancer is loose, cracked, or separated, it will need to be replaced.
Excessive vibrations or weird noises: Your crankshaft harmonic balancer manages your engine’s vibrations, so if you feel harsh vibrations or hear strange noises coming from the engine bay of your vehicle, it may be due to a failing harmonic balancer. If left unchecked, these vibrations can affect other integral parts of your car.
Misalignment or pulley issues: A misaligned balancer, belt slippage, or pulley issues may be the result of a faulty crankshaft harmonic balancer. If these issues are not resolved, they can affect your vehicle’s overall performance.
Check engine light: Your check engine light will turn on if there is an issue with your crankshaft, including damage to your crankshaft harmonic balancer. Your mechanic can use an OBD-II scanner to check for trouble codes associated with the harmonic balancer.
How often should a crankshaft harmonic balancer be replaced?
Manufacturers do not typically outline specific lifespans or replacement intervals for crankshaft harmonic balancers. With this said, most crankshaft harmonic balancers last 50,000 miles or approximately 10 years.
Can I replace my crankshaft harmonic balancer myself?
If you’re a DIY car repair expert with the tools and knowledge to back the replacement, you may be able to replace your crankshaft harmonic balancer on your own.
However, a crankshaft harmonic balancer replacement requires a fair understanding of your engine’s complex components, and you’ll also need special tools. If you’re a DIY car repair beginner, opt for a trusted mechanic to ensure your crankshaft harmonic balancer is replaced correctly