Parts for your 1990 Mitsubishi Pajero-Drive belt pulley

1990 Mitsubishi Pajero Drive-Belt Pulley – Purpose, Care, and When to Replace

Based on recognised technical references – including the Mitsubishi Pajero factory service manuals (1989–1993), the Mitsubishi ASA electronic parts catalogue, Gates and Dayco application catalogues, and the Haynes Mitsubishi Pajero/Montero 1983–1999 repair manual – the 1990 Mitsubishi Pajero is absolutely fitted with multiple drive-belt pulleys. Depending on engine (4D56 2.5 turbo-diesel, 4G54 2.6 petrol, or 6G72 3.0 V6), it runs one or more accessory belts over the crankshaft pulley (harmonic balancer) to spin the alternator, power steering pump and A/C compressor, with idler and tensioner pulleys managing belt wrap and tension. In some variants, a belt may also assist ancillary drives.

For anyone keeping a 1990 Pajero in top nick, the drive-belt pulleys do a heap of quiet work under the bonnet. Their job is simple but vital: transmit engine torque from the crank to essential accessories. The crank pulley’s rubber-damped hub (harmonic balancer) also quells torsional vibration, which helps protect the V6 and four-cylinder engines from harmonic nasties. Smooth, correctly aligned pulleys and the right belt tension keep charging strong, steering light, and A/C cold – especially important on outback or off-road trips.

Regular servicing should include a close look at every pulley. Mitsubishi’s workshop guidance and aftermarket catalogues alike recommend inspecting belt condition, pulley grooves, and bearing health at routine intervals. On these older Pajeros, many adjusters are manual, so belt tension needs checking. Watch the crank pulley too: the bonded rubber can harden or delaminate with age and oil exposure.

• Listen for squeals or chirps on start-up – often tension or misalignment.
• Growling or rumbling at idle points to a dry or failing idler/tensioner bearing.
• Wobble at the crank pulley suggests harmonic balancer deterioration.
• Glazed, cracked, or frayed belts mean the pulleys and belts should be replaced together.

When it’s time to replace, use quality OEM-equivalent pulleys and the correct belts per engine code. Under the bonnet, check for oil leaks that can attack rubber dampers. If the crank pulley is removed on a 6G72 V6, use the proper holding tool and observe the high bolt torque – no rattle-guns on the balancer’s outer ring. After fitting new belts on manual adjusters, recheck tension after a few hundred kilometres. A tidy belt line, true-running pulleys, and the right tension will keep a 1990 Pajero charging, cooling and steering sweetly for years.

Popular questions about 1990 Mitsubishi Pajero drive-belt pulleys

What noises point to a failing drive-belt pulley on a 1990 Pajero?
Chirps or squeals on a cold start usually mean belt slip or a misaligned pulley. A steady growl at idle often indicates a dry or worn idler/tensioner bearing. If the crank pulley wobbles or there’s a rhythmic thump, the harmonic balancer’s rubber damper may be separating and needs urgent attention.

How often should belts and pulleys be replaced?
Inspect at every service and replace belts about every 60,000–100,000 km or 4–6 years, sooner if there’s cracking or glazing. Replace any pulley with rough, notchy, or noisy bearings, and renew the harmonic balancer if its rubber shows cracking, offset grooves, or wobble. It’s smart to change related belts and suspect pulleys together.

Can the 1990 Pajero be converted to a single serpentine belt?
Most 1990 Pajero engines use multiple V-belts with manual adjusters. Conversions to a single serpentine setup aren’t common and typically require custom brackets and parts. For reliability and parts availability across Australia and New Zealand, sticking with the original belt and pulley layout is the practical choice.