Parts for your 2020 Mitsubishi Asx-Harmonic balancers

2020 Mitsubishi ASX harmonic balancers — purpose, care and when to replace

Yes, the 2020 Mitsubishi ASX runs a harmonic balancer. Technical sources identify it as the torsional-damped crankshaft pulley used on the ASX’s 2.0L/2.4L MIVEC four-cylinder engines (4B11/4B12). The Mitsubishi Motors Service Manual for these engines (Engine Mechanical: Crankshaft Pulley and Torsional Damper) specifies a rubber-bonded damper on the crank. Mitsubishi’s ASA parts catalogue lists the crankshaft pulley as a damper assembly for GA–XD ASX models, and major aftermarket catalogues (e.g., Dayco PowerBond and Gates) carry harmonic balancers for 2010–2021 ASX/Outlander Sport applications. So it’s very much a used and relevant component on the 2020 ASX.

What does it do? In short, the harmonic balancer tames crankshaft twist and vibration caused by the firing pulses of the engine. It’s a two-piece pulley with a rubber layer between the hub and the outer ring. That rubber lets the outer ring “lag” just enough to counter torsional spikes, protecting the crank, timing set and accessories. On the ASX, it also keeps the serpentine belt driving the alternator and A/C smoothly, helping reduce cabin buzz and belt squeal.

There’s no fixed service interval for the ASX harmonic balancer, but it should be checked during regular servicing, especially past 120,000–150,000 kilometres or 7–10 years. Heat, oil contamination and age can harden or crack the rubber bond. If the outer ring drifts or the hub separates, it can wobble, chew belts or create nasty vibrations.

• Common symptoms: noticeable vibration at idle or around 1,500–2,500 rpm, chirping or fraying belts, visible pulley wobble, or a burning rubber smell under the bonnet.
• Inspection tips: with the engine off, look for radial cracks in the rubber, rubber “squeeze-out,” or a misaligned outer ring. Spin the pulley by hand to feel for binding and check belt tracking.
• Replacement advice: use a quality OEM-equivalent damped pulley. Renew the crank bolt and keyway if specified by the service manual. A proper holding tool and correct torque/angle are essential—don’t rattle it home with an impact. Clean any oil leaks first so the new damper isn’t bathed in fluid.

If an owner’s ASX is feeling vibey, eating belts, or the pulley looks wonky, it’s time to sort the balancer before it takes out the belt or stresses the crank. A fresh damper restores smoothness and keeps the ASX humming along nicely for the long haul.

Does the 2020 ASX actually have a harmonic balancer?

It does. The crankshaft pulley on the 2.0L/2.4L MIVEC engines is a torsional damper (harmonic balancer) defined in Mitsubishi’s engine mechanical service information and listed as a damper assembly in the parts catalogue. Aftermarket application guides also list a dedicated harmonic balancer for this model.

How long will an ASX harmonic balancer last?

Many last well past 150,000 kilometres, but age, heat and oil contamination can shorten life. Start regular inspections around 120,000 kilometres or 7 years. Replace at the first sign of rubber degradation, pulley wobble or persistent vibration.

What’s the risk of driving with a failing balancer?

Left too long, the outer ring can slip or separate, causing belt misalignment, charging issues and increased engine vibration. In the worst case, it can damage the belt or stress the crankshaft. Replacing early is cheaper than chasing collateral damage.