Parts for your 2004 Mitsubishi Pajero-Water pump

2004 Mitsubishi Pajero Water Pump — What It Does and When to Sort It

Based on technical references including the Mitsubishi Pajero/Montero Workshop Manual (Gen 3, 2000–2006), Mitsubishi ASA/CAPS parts catalogue, and aftermarket listings from Gates and Aisin, the 2004 Mitsubishi Pajero is fitted with a conventional engine water pump. It’s relevant across the range: the 3.5L and 3.8L V6 (6G74/6G75) use a timing-belt-driven pump, while the 3.2L Di‑D diesel (4M41) uses a belt-driven pump off the accessory drive. So yes, there’s a water pump on this model, and it’s a key part of the cooling system.

The water pump keeps coolant moving through the block, heads, thermostat and radiator, stopping heat soak and protecting the engine on hot Aussie and Kiwi days, towing, or slogging up long climbs. When it’s doing its job, temps stay steady, heaters work properly, and the engine lasts longer.

For V6 owners, the smart play is to replace the water pump whenever the timing belt is done—typically around 90,000–100,000 kilometres or 6 years, per common service practice reflected in Mitsubishi schedules and timing component kit guides. The pump sits behind the timing covers, so it’s efficient to do it while everything’s open. Use a quality pump (OE or reputable aftermarket), a fresh gasket or sealant as specified, and new coolant. Bleed the cooling system thoroughly to avoid airlocks.

For the 3.2 Di‑D diesel, there’s no timing belt, the cam drive is by chain and the water pump is on the accessory belt. There’s no fixed pump replacement interval, but it should be inspected every service. Replace it if there’s wobble, noise, or leakage from the weep hole. Many workshops in AU/NZ see pumps last well beyond 150,000 km, but they’re often renewed around 200,000 km or when doing radiators, thermostats, or major cooling work.

• Watch for signs of trouble: coolant drips or crusty staining at the pump, rumbling or squealing, temp gauge spikes, poor heater output, or wobble at the pulley.
• Use the correct coolant spec and a 50/50 demineralised water mix unless premix is used, refresh at the interval recommended for the coolant type.
• Inspect accessory belts and tensioners, a tired belt can take out a good pump.

Look after the pump and coolant, and the Pajero’s cooling system will handle heat, towing, and off-road work without a fuss.

FAQs

Does the 2004 Pajero’s water pump run off the timing belt?
On the V6 3.5/3.8 engines, yes—the pump is driven by the timing belt. On the 3.2 Di‑D diesel, the pump is driven by the accessory belt, not the timing system.

When should the water pump be replaced?
V6 owners typically replace it with the timing belt at around 90,000–100,000 km or 6 years. Diesel owners replace on condition—if there’s leakage, noise, or play—or proactively around major cooling service, often beyond 150,000–200,000 km.

What are the common symptoms of a failing water pump?
Coolant weeping from the pump, crusty residue near the weep hole, bearing noise, pulley wobble, intermittent overheating, or weak cabin heat. Any of these warrant prompt inspection.