Parts for your 2001 Mitsubishi Pajero-Drive belt pulley

2001 Mitsubishi Pajero drive-belt pulleys: what they do and when to service them

Yes, the 2001 Mitsubishi Pajero absolutely uses drive‑belt pulleys. Factory technical sources list them as part of the accessory drive system: the Mitsubishi Pajero NM/NP Workshop Manual, the Mitsubishi electronic parts catalogue for NM/NP series (covering 6G74 V6 petrol and 4M41 3.2 Di‑D diesel), and aftermarket catalogues such as Gates Accessory Belt Drive System references all identify a crankshaft (harmonic balancer) pulley, alternator pulley, power steering and A/C compressor pulleys, plus idler and tensioner pulleys. These pulleys guide and drive the belt that spins your alternator, power steering pump, water pump (application‑dependent), and air‑con.

On the Pajero, the crankshaft pulley (often called the harmonic balancer) is the big one at the bottom. It transmits engine torque to the belt and also dampens vibration through a bonded rubber layer. Idler and tensioner pulleys keep the belt aligned and at the right tension, while accessory pulleys free‑wheel on bearings and turn only when driven by the belt.

Why it matters? If a pulley’s rubber damper degrades, or if a bearing gets gritty, you’ll cop squeaks, chirps, or a wobble at idle. Ignore it and you risk a thrown belt, flat battery, sudden loss of power steering assist, overheating, or no A/C on a stinking hot day.

• Inspection: Have the belt and pulleys checked at regular services (every 20,000–30,000 km). Look for pulley wobble, glazing, cracks in the balancer’s rubber, or rusty dust from failing bearings.
• Replacement timing: Belts are typically replaced around 90,000–100,000 km or earlier if worn. It’s smart to replace noisy idler/tensioner pulleys at the same time. Any sign of delamination on the crank pulley means replace it immediately.
• Good practice: Use quality OEM‑equivalent parts, confirm belt routing, and set the correct tension (or fit the correct auto‑tensioner). After installation, recheck for noise and belt tracking with the bonnet up.
• Diesel note: The 4M41 is known for harmonic balancer wear with age, catching it early prevents collateral damage.

If the Pajero’s making a cold‑start chirp, there’s play in an idler, or the crank pulley looks off‑centre, it’s time for a closer look. A fresh pulley and belt combo is cheap insurance that keeps the big Mitsi touring without drama.

Popular questions

What does the drive‑belt pulley actually do on a 2001 Pajero?

It transfers engine rotation to the accessories via the belt. The crankshaft pulley drives the belt, idlers and a tensioner guide and maintain tension, and the accessory pulleys spin the alternator, power steering pump, water pump (on certain engines), and A/C compressor. The harmonic balancer also dampens vibration to protect the engine and the belt system.

How often should Pajero drive‑belt pulleys be replaced?

There’s no single kilometre rule for all pulleys, but many techs inspect every service and expect idler/tensioner bearings to last roughly 100,000–150,000 km. Replace immediately if there’s noise, play, wobble, or cracking in the balancer’s rubber. Pairing a new belt with fresh noisy pulleys saves repeat labour.

Is it safe to drive with a noisy or wobbling pulley?

Not recommended. A failing pulley can spit the belt, which can mean loss of charging, power steering assist, and cooling. If you hear chirps, grinding, or see the pulley running off‑centre, park up and get it checked before it strands you.