Parts for your 2001 Mitsubishi Pajero-Water pump

2001 Mitsubishi Pajero Water Pump — What It Does and When To Replace It

Yes, a water pump is absolutely fitted and relevant on the 2001 Mitsubishi Pajero. Technical sources such as the Mitsubishi Pajero NM/NP Workshop Manual (Cooling System), the Mitsubishi ASA electronic parts catalogue, and Australian catalogue listings from Gates and Dayco confirm factory water pumps for both the 3.5L 6G74 petrol and the 3.2L 4M41 Di-D diesel. The 6G74’s pump sits behind the timing covers and is driven by the timing belt, while the 4M41’s pump is externally driven by the accessory belt.

On this Pajero, the water pump’s job is to keep coolant moving through the block, heads, heater core and radiator so the engine sits right in its sweet spot for temperature. That means better performance, fewer dramas under the bonnet on hot days, and reduced risk of head gasket grief. A healthy pump also helps your heater work properly and keeps temps stable on long tows or outback runs.

Servicing depends on the engine fitted. For the 3.5L V6 (6G74), the pump is typically replaced as preventative maintenance when doing the timing belt, usually around the 90,000–100,000 km mark or at the time interval specified in the service schedule. It’s smart value: you’re already in there, so swap the pump, idlers and tensioner together. For the 3.2L diesel (4M41), there’s no fixed pump interval, inspect it at each service and replace on condition (leaks, noise or play), and renew the accessory belt if it’s glazed or cracked.

• Common warning signs: coolant drips from the weep hole, a chirp or rumble from the pump bearing, temp gauge creeping up or fluctuating, sweet coolant smell, or wobble at the pulley.
• Coolant care: use a quality ethylene glycol coolant that meets Mitsubishi specs and mix correctly with demineralised water. Don’t mix types, flush if changing chemistry. Refresh at the interval in the owner’s manual (often every 2–4 years).

1. If replacing: choose a reputable pump and gasket, clean mating faces, use the correct sealant if specified, torque bolts evenly, and bleed the cooling system thoroughly.
2. Pair the job with a new thermostat and radiator cap, and pressure-test to confirm it’s leak-free.
3. For 6G74: replace with the timing belt kit. For 4M41: inspect the accessory belt, tensioner and idlers at the same time.

Done right, the Pajero’s water pump will deliver years of fuss-free cooling whether it’s school runs or corrugated tracks.

FAQs

How often should the water pump be replaced on a 2001 Pajero?
On the 3.5L V6 (6G74), it’s best replaced with the timing belt at the kilometre/time interval in the service schedule (commonly around 90,000–100,000 km). On the 3.2L diesel (4M41), there’s no set interval—inspect at each service and replace if it leaks, gets noisy, or shows pulley play.

What coolant should be used?
Use a quality ethylene glycol coolant that meets Mitsubishi specifications, mixed with demineralised water (often 50/50 unless the product says otherwise). Avoid mixing different coolant chemistries and refer to the owner’s manual for capacity and change intervals.

Can it be driven with a failing water pump?
Not recommended. A failing pump can quickly lead to overheating and expensive engine damage. If temps rise or coolant is pouring out, stop, let it cool, and arrange a tow.