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Cooling

Water pump failure

2014–2021 Mitsubishi Pajero 3.0 L diesel · V61

Replace the front‑mounted water pump on a 2014 Mitsubishi Pajero V61 3.0 L V6 turbo‑diesel to stop overheating and coolant loss.

Difficulty
Moderate
Time
3h
Parts
4
Sources
5

Before you start

  • Engine and coolant are extremely hot after operation – allow the engine to cool completely before starting work.
  • Coolant is toxic; avoid skin contact and dispose of drained fluid according to local regulations.
  • Incorrect torque on the water pump bolts can cause leaks or damage the engine block – verify torque values against the factory service manual.
  • Running the engine with air trapped in the cooling system can cause severe overheating – be sure to bleed the system properly after refill.
  • Do not start the vehicle until the battery is re‑connected and the coolant level is correct.

Steps

  1. Secure the vehicle and disconnect power Park on a level surface, engage the parking brake, place wheel chocks, and disconnect the negative battery terminal.
  2. Drain the cooling system Place a drain pan under the radiator drain plug, open the plug, and allow all coolant to flow out. Close the plug once drained.
  3. Remove engine cover (if equipped) Unscrew the fasteners securing the plastic engine cover and lift it away to expose the belt and pump area.
  4. Release the drive (serpentine) belt Rotate the belt tensioner using the appropriate socket to relieve tension, then slip the belt off the water pump pulley and other pulleys.
  5. Remove the water pump pulley (if separate) Loosen and remove the pulley retaining bolt, then pull the pulley off the pump shaft.
  6. Unbolt the water pump Remove all mounting bolts (typically 4‑6) holding the pump to the engine block. Keep bolts organized.
  7. Extract the old pump and clean mating surfaces Pull the water pump away from the block. Scrape away old gasket material and any sealant residue from the block surface, being careful not to gouge the metal.
  8. Install new gasket / O‑ring Place the new gasket or O‑ring onto the block as supplied. If the manufacturer recommends sealant, apply a thin, even bead of RTV silicone to the gasket surface.
  9. Mount the new water pump Position the new pump onto the block, insert the mounting bolts, and hand‑tighten them in a criss‑cross pattern.
  10. Torque the pump bolts Using a torque wrench, tighten the mounting bolts to the specification listed in the factory service manual (typically around 8‑10 Nm, but verify).
  11. Reinstall the pulley and belt Place the pulley back on the pump shaft, reinstall the retaining bolt, and then route the serpentine belt according to the diagram. Use the tensioner to apply proper belt tension.
  12. Refill the cooling system Close the radiator drain plug, then fill the system with the specified coolant (Mitsubishi G12 type, 50/50 mix). Fill until the coolant reaches the “MAX” mark on the reservoir.
  13. Bleed air from the cooling system Start the engine, let it idle with the heater set to hot, and watch the coolant level. Add coolant as the level drops until it stabilizes and no air bubbles are visible.
  14. Reconnect the battery and final check Re‑attach the negative battery terminal, start the engine, and monitor temperature gauge and for any leaks around the pump.

Parts

  • Water pump — OEM‑spec water pump for 2014‑2021 Mitsubishi Pajero V61 3.0 L V6 turbo‑diesel ×1
  • Water pump gasket / O‑ring set — OEM‑spec gasket or silicone O‑ring set for the same pump ×1
  • Coolant — Mitsubishi approved ethylene‑glycol coolant, 50/50 mix with distilled water (or equivalent G12 type) ×5‑6 L
  • Sealant (if required) — High‑temperature RTV silicone sealant, compatible with coolant systems ×1 tube

Tools

  • Metric socket set (including 10 mm, 13 mm, 17 mm)
  • Torque wrench
  • Screwdrivers (flat and Phillips)
  • Pliers
  • Drain pan
  • Rubber mallet or soft‑face hammer
  • Coolant bleed kit or funnel
  • Jack and jack stands (or ramps) if needed for better access
  • Shop rags

Sources

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