Parts for your 1991 Mitsubishi Pajero-Drive belt pulley

1991 Mitsubishi Pajero Drive Belt Pulley — What It Does and How to Look After It

Yes, the 1991 Mitsubishi Pajero uses drive-belt pulleys. Factory documentation and reputable manuals show accessory belts and pulleys across the petrol and diesel engines fitted to this model. The Mitsubishi Motors Workshop Manual for the Pajero/Montero range (covering 1991), the Mitsubishi ASA parts catalogue, and third-party manuals such as the Haynes Pajero/Montero manual (1983–1996 coverage) all list the crankshaft (harmonic balancer) pulley, alternator, power steering, A/C and idler/tensioner pulleys for engines like the 6G72 3.0L V6, 4G54 2.6L petrol, and 4D56 2.5L turbo-diesel.

On a ’91 Pajero, the drive-belt pulleys transfer rotation from the crankshaft to vital accessories: alternator, water pump, power steering pump and A/C compressor. Many variants use multiple V-belts rather than a single serpentine belt, so each accessory has its own groove(s) on the crank pulley and matching pulleys on the driven components. Idler and tensioner pulleys keep belt tension spot-on and belts tracking straight.

As part of routine servicing, it’s smart to inspect pulleys every 10,000 km or at each service. Look for wobble at idle, belt walk, or a pulley face that’s chewed out. Spin idler/tensioner pulleys by hand with the belts off, any roughness, grinding or play means a new pulley is due. On the crank pulley/harmonic balancer, check the bonded rubber layer for cracks or separation—delamination can shift timing marks, throw belts and make a mess under the bonnet.

Common signs of trouble include:

• Cold-start squeal or chirp that doesn’t go away with a new belt
• Charging issues, heavy steering or overheating at idle
• Visible pulley misalignment or a belt riding out of its groove

Replacement tips for the home spannerer: use quality OEM or reputable aftermarket pulleys, match the groove profile to your belts (many ’91s aren’t serpentine). For the crank pulley, use a holding tool, follow the service manual torque spec, and replace the crank bolt and key if specified. Keep belts correctly tensioned—over-tightening will knock out bearings in short order. On the 4D56 diesel, note the timing belt is separate, don’t confuse its pulleys with the accessory drive.

A tidy set of pulleys and fresh belts keeps the Pajero charging strongly, steering lightly and cooling reliably—ideal for Aussie and Kiwi conditions from city traffic to corrugations and beach runs.

1. During each service: inspect belt condition, pulley faces, and alignment.
2. Every 60,000–100,000 km: replace worn belts, renew noisy or loose idler/tensioner pulleys.
3. Immediately: replace any crank pulley with perished rubber or wobble.

Popular questions

Does a 1991 Mitsubishi Pajero have a serpentine belt or multiple V-belts?
Most 1991 Pajero variants run multiple V-belts for the alternator, power steering and A/C, driven off a multi-groove crank pulley. Some later or specific trims may differ, so it’s worth checking the belt routing diagram under the bonnet or the service manual for your exact engine code.

How often should drive-belt pulleys be replaced on a ’91 Pajero?
There’s no strict time-based interval for pulleys, they’re replaced on condition. Inspect at every service. Renew idler/tensioner pulleys when their bearings feel rough or noisy, and replace the crank pulley if the rubber damper shows cracks or separation. Belts typically last 60,000–100,000 km depending on use and climate.

What happens if the crank pulley (harmonic balancer) fails?
If the crank pulley delaminates or wobbles, belts can slip or jump, leading to loss of charging, heavy steering and overheating. In worst cases, a thrown belt can damage shrouds or radiators. If there’s any sign of failure, park it and replace the pulley before further driving.