Parts for your 1989 Mitsubishi Pajero-Harmonic balancers

1989 Mitsubishi Pajero harmonic balancer — fitment, purpose and servicing tips

Yes, a harmonic balancer is fitted to 1989 Mitsubishi Pajero engines. This includes the popular 2.5-litre 4D56 diesel, the 2.6-litre 4G54 petrol, and the 3.0-litre 6G72 V6. Technical sources that document this include: the Mitsubishi Pajero/Montero Factory Service Manual (1988–1991) engine section describing the crankshaft pulley with integrated vibration damper, the Mitsubishi ASA electronic parts catalogue, which lists a “vibration damper/crankshaft pulley” for these engines, and aftermarket catalogues from Dayco/PowerBond and Gates that supply direct-fit harmonic balancers for 1989 Pajero models.

On these engines, the harmonic balancer (also called a crankshaft pulley damper) is a two-piece pulley with a bonded rubber layer. Its job is to soak up torsional vibrations from the crankshaft, keeping the engine smooth, protecting the timing gear/belt, and preventing accessory drive issues. On the torquey 4D56 diesel in particular, the damper does a lot of heavy lifting at low revs, but it’s just as important on the 4G54 and 6G72 to help longevity and refinement.

There’s no fixed replacement interval, but it pays to inspect the balancer at each service or every 10,000 km. Look for tell-tales under the bonnet that the rubber isolator is on the way out or the outer ring is shifting.

• Cracked, perished or oil-soaked rubber between hub and outer ring
• Wobble at idle, belt tracking off-line or flickering charge light
• Chirp/squeal that isn’t cured by a new belt, or a rhythmic knock
• Visible separation of the outer ring from the hub

If any of that shows up, replacement is the smart move. Use a quality OEM or reputable aftermarket damper, and renew the drive belts if they’ve been contaminated. It’s also worth checking the front crank seal and timing cover area for leaks while you’re in there. A proper holding tool is strongly recommended for the crank pulley bolt, and torque should follow the workshop manual spec for your exact engine. Make sure the keyway and woodruff key are in good nick and that the pulley seats fully on the snout.

Plenty of older Pajeros are still running original dampers. If it’s 15+ years old or north of 250,000 km, a preventative replacement isn’t a bad shout. After fitment, if there’s still vibration, look at engine mounts, ignition/injector condition, and belt alignment. Keeping the balancer healthy helps keep the whole driveline happier for the long haul across NZ and Aussie roads.

Popular questions about 1989 Mitsubishi Pajero harmonic balancers

Does the 1989 Pajero (2.5 diesel and 3.0 V6) actually have a harmonic balancer?
Yes. Both the 4D56 2.5 diesel and the 6G72 3.0 V6 (as well as the 4G54 2.6 petrol) use a crankshaft pulley with an integrated torsional damper. This is documented in the Mitsubishi factory service manual and parts catalogues and reflected in widespread aftermarket availability.

What symptoms point to a failing harmonic balancer on a 1989 Pajero?
Common signs include a wobbling crank pulley, cracked/perished rubber in the damper, chirping or squealing that persists after new belts, misaligned belts, or a flickering battery light at idle. On diesels, you might also feel extra harshness through the cabin at certain revs.

Can a worn balancer affect the timing belt on these engines?
Indirectly, yes. A degrading damper can cause pulley runout and poor belt tracking, which may accelerate wear on the accessory belts and place extra load on the timing system. If the balancer’s hub or keyway is damaged, it can also impact timing accuracy. If there’s any doubt, inspect the timing components when replacing the balancer.