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Nissan Armada 2025-2026 Service and Repair Manual: Water Pump

Nissan Armada 2025-2026 Service and Repair Manual / Engine / Engine Cooling System / Water Pump

Exploded View

Water pump Gasket    
: N·m (kg-m, ft-lb)        
: Always replace after every disassembly.        

Removal & Installation

WARNING:

Jacking up or lift up the vehicle may the vehicle height to go down which cause a personal injury and/or damage to the air suspension component parts. Refer to Precaution for when Jacking and Lifting Up the vehicle with Electronic Air Suspension System.

CAUTION:

  • When removing water pump assembly, be careful not to get engine coolant on drive belts.

  • Water pump cannot be disassembled and should be replaced as a unit.

  • After installing water pump, connect hose and clamp securely, then check for leakage using the radiator cap tester (commercial service tool) and the radiator cap tester adapter (commercial service tool).

REMOVAL

Remove front undercover using a power tool. Refer to Removal and Installation.

Drain engine coolant from drain plugs on radiator and cylinder block. Refer to following:

  • Radiator: Refer to ENGINE COOLANT : Draining.

  • Cylinder block: Refer to Setting.

CAUTION:

  • Perform this step when engine is cold.

  • Never spill engine coolant on drive belt.

Remove air duct 1 and inlet air duct 2. Refer to Removal and Installation.

Remove drive belt. Refer to Removal & Installation.

Remove reservoir tank tube .

Remove water pump.

  • Engine coolant will leak from cylinder block, so have a receptacle ready under vehicle.

CAUTION:

  • Handle the water pump vane so that it does not contact any other parts.

  • Never disassemble water pump.

INSTALLATION

Install in the reverse order of removal.

Inspection

INSPECTION BEFORE REMOVAL

NOTE:

The sealing surface between the water pump body and the shaft is lubricated by engine coolant.

A small amount of engine coolant is discharged from the lubrication surface during normal operation and may be found as a coolant residue on the plug, bleed hole, or bottom of water pump assembly.

In case of coolant residue is found on the water pump assembly, check the water pump leakage as following steps.

  1. Wipe off the engine coolant residue on water pump assembly.

  2. Open the reservoir tank cap.

  3. Apply pressure to the cooling system with the radiator cap tester (commercial service tool) (A) and radiator cap tester adapter (commercial service tool) (B).

    Testing pressure : Refer to RADIATOR : Service Data.

  4. Hold pressure for 20 minutes and check the engine coolant leakage from plug or bleed hole.

  5. Close the reservoir tank cap.

  6. Maintain idling for 20 minutes after engine warm up and stop engine.

  7. Check the water leakage around plug , drain hole or bleed hole .

  8. If engine coolant leakage is found in step 4 or 7, replace the engine water pump assembly.

INSPECTION AFTER REMOVAL

  • Check visually that there is no significant dirt or rusting on water pump body and vane .

  • Check that there is no looseness in vane shaft, and that it turns smoothly when rotated by hand.

  • Replace water pump, if necessary.

INSPECTION AFTER INSTALLATION

  • Check that the reservoir tank cap is tightened.

  • Check for leakage of engine coolant using the radiator cap tester adapter (commercial service tool) and the radiator cap tester (commercial service tool). Refer to ENGINE COOLANT : Inspection.

  • Start and warm up the engine. Visually check that there is no leakage of engine coolant.

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