Toyota
Jeep Cherokee
 Service Manual
Cooling system » Removal and installation
Water pump

CAUTION: If the water pump is replaced because of mechanical damage, the fan blades and viscous fan drive should also be inspected. These components could have been damaged due to excessive vibration.

The water pump can be removed without discharging the air conditioning system (if equipped).

CAUTION: All engines have a reverse (counterclockwise) rotating water pump. The letter R is stamped into the back of the water pump impeller (Fig. 25) to identify. Engines from previous model years, depending upon application, may be equipped with a forward (clockwise) rotating water pump. Installation of the wrong water pump will cause engine over heating.

Fig. 25 Reverse Rotating Water Pump-Typical
Fig. 25 Reverse Rotating Water Pump-Typical

1 - R STAMPED INTO IMPELLER

The water pump impeller is pressed on the rear of the pump shaft and bearing assembly. The water pump is serviced only as a complete assembly.

WARNING: DO NOT REMOVE THE BLOCK DRAIN PLUG(S) OR LOOSEN RADIATOR DRAINCOCK WITH THE SYSTEM HOT AND UNDER PRESSURE.

SERIOUS BURNS FROM COOLANT CAN OCCUR.

DO NOT WASTE reusable coolant. If the solution is clean, drain coolant into a clean container for reuse.

REMOVAL-2.5L ENGINE (LHD/RHD)

(1) Disconnect battery negative cable.

(2) Drain cooling system. Refer to Cooling System- Draining and Filling in this group.

(3) Remove upper radiator hose.

(4) Loosen (but do not remove at this time) the four fan hub-to-water pump pulley mounting nuts (Fig. 26).

(5) Remove accessory drive belt. (Refer to Accessory Drive Belt, Removal and Installation in this group) (6) Disconnect electric cooling fan connector (if equipped).

(7) Unbolt fan shroud.

(8) Remove the four fan hub-to-water pump pulley nuts and remove fan and shroud together.

CAUTION: After removing fan blade/viscous fan drive assembly, do not place thermal viscous fan drive in horizontal position. If stored horizontally, silicone fluid in viscous fan drive could drain into its bearing assembly and contaminate lubricant.

(9) Remove power steering pump and bracket (Fig.

27), refer to Group 19 Steering for correct procedure.

(10) Remove lower radiator hose from water pump.

Remove heater hose from water pump pipe.

(11) Remove the four pump mounting bolts (Fig.

28) and remove pump from vehicle. Discard old gasket.

Note that one of the four bolts is longer than the other bolts.

(12) If pump is to be replaced, the heater hose fitting must be removed. Note position of fitting before removal.


Fig. 26 Fan Mounting Nuts

1 - THERMAL VISCOUS FAN DRIVE
2 - (4) FAN BLADE-TO-VISCOUS DRIVE BOLTS
3 - (4) FAN HUB-TO-PUMP PULLEY STUDS
4 - WATER PUMP
5 - WATER PUMP PULLEY
6 - FAN BLADE
7 - (4) FAN HUB-TO-PUMP PULLEY NUTS

INSTALLATION-2.5L ENGINE (LHD/RHD)

(1) If pump is being replaced, install the heater hose pipe to the pump. Use a sealant on the fitting such as Mopart Thread Sealant With Teflon. Refer to the directions on the package.

(2) Clean the gasket mating surfaces. If the original pump is used, remove any deposits or other foreign material. Inspect the cylinder block and water pump mating surfaces for erosion or damage from cavitation.

Fig. 27 Power Steering Pump Attachment-2.5L
Fig. 27 Power Steering Pump Attachment-2.5L

1 - INTAKE MANIFOLD
2 - PUMP ASSEMBLY 2.5L
3 - PUMP BRACKET

Fig. 28 Water Pump Remove/Install-Typical
Fig. 28 Water Pump Remove/Install-Typical

1 - HEATER HOSE FITTING
2 - UPPER VENT HOLE
3 - PUMP GASKET
4 - WATER PUMP
5 - LOWER VENT HOLE
6 - LONG BOLT
7 - BOLTS (3) SHORT

(3) Install the gasket and water pump. The silicone bead on the gasket should be facing the water pump. Also, the gasket is installed dry. Tighten mounting bolts to 23 N·m (17 ft. lbs.) torque. Rotate the shaft by hand to be sure it turns freely.

(4) Connect the radiator and heater hoses to the water pump.

(5) Install power steering pump and bracket. Refer to Group 19, Steering.

(6) Position water pump pulley to water pump hub.

(7) Install shroud and fan together and install four nuts to water pump hub studs. Tighten nuts to 27 N·m (20 ft. lbs.) torque.

(8) Install and tighten upper fan shroud nuts to 4 N·m (31 in. lbs.).

(9) Connect electric fan connector (if equipped).

CAUTION: When installing the accessory drive belt, the belt MUST be routed correctly. If not, the engine may overheat due to the water pump rotating in the wrong direction. Refer to the Belt Removal and Installation in this group for appropriate belt routing.

You may also refer to the Belt Routing Label in the vehicle engine compartment.

(10) Install and tension accessory drive belt, refer to Accessory Drive Belt removal and installation in this group.

(11) Install upper radiator hose.

(12) Fill cooling system with coolant and check for leaks. Refer to Refilling Cooling System in this group.

(13) Connect battery negative cable.

(14) Start and warm the engine. Check for leaks.

REMOVAL-4.0L ENGINE (LHD/RHD)

(1) Disconnect battery negative cable.

(2) Drain the cooling system. (Refer to Cooling System-Draining and Filling in this group.) (3) Disconnect electric cooling fan connector.

(4) Remove electric cooling fan/shroud assembly (if equipped).

(5) Remove viscous fan shroud bolts (2).

(6) Loosen (but do not remove at this time) the four water pump pulley-to-water pump hub mounting bolts (Fig. 29) and the four viscous fan to idler pulley nuts.

NOTE: The accessory drive belt must be removed prior to removing the fan (if installed at pump) or fan pulley.

(7) Remove accessory drive belt (refer to Accessory Drive Belt, Removal and Installation in this group)

Fig. 29 Water Pump Pulley Bolts
Fig. 29 Water Pump Pulley Bolts

1 - WATER PUMP HUB
2 - BOLTS (4)
3 - PUMP PULLEY

(8) Remove the four viscous fan to idler pulley nuts and remove the fan and shroud together.

CAUTION: After removing fan blade/viscous fan drive assembly, do not place thermal viscous fan drive in horizontal position. If stored horizontally, silicone fluid in viscous fan drive could drain into its bearing assembly and contaminate lubricant.

(9) Remove the four water pump pulley bolts and remove the pulley.

(10) Remove power steering pump and bracket (Fig. 30), refer to Group 19 Steering.

(11) Remove lower radiator hose from water pump.

Remove heater hose from water pump fitting.

(12) Remove the four pump mounting bolts (Fig.

31) and remove pump from vehicle. Discard old gasket.

Note that one of the four bolts is longer than the other bolts.

(13) If pump is to be replaced, the heater hose fitting must be removed. Note position of fitting before removal.

INSTALLATION-4.0L ENGINE (LHD/RHD)

(1) If pump is being replaced, install the heater hose fitting to the pump. Use a sealant on the fitting such as Mopart Thread Sealant With Teflon. Refer to the directions on the package.

(2) Clean the gasket mating surfaces. If the original pump is used, remove any deposits or other foreign material. Inspect the cylinder block and water pump mating surfaces for erosion or damage from cavitation.

(3) Install the gasket and water pump. The silicone bead on the gasket should be facing the water pump. Also, the gasket is installed dry. Tighten mounting bolts to 23 N·m (17 ft. lbs.) torque. Rotate the shaft by hand to be sure it turns freely

Fig. 30 Power Steering Pump Attachment-4.0L
Fig. 30 Power Steering Pump Attachment-4.0L

1 - PUMP ASSEMBLY
2 - PUMP BRACKET

(4) Connect the radiator and heater hoses to the water pump.

(5) Position water pump pulley to water pump hub.

(6) Install four pump pulley bolts. Tighten bolts (or nuts) to 27 N·m (20 ft. lbs.) torque.

(7) Install power steering pump. Refer to Group 19, Steering for proper procedure and torque values.

(8) Install the viscous fan and shroud together.

Install the four fan to idler pulley nuts and tighten to 27 N·m (20 ft. lbs.).

CAUTION: When installing the accessory drive belt, the belt MUST be routed correctly. If not, the engine may overheat due to the water pump rotating in the wrong direction. Refer to the Belt Removal and Installation in this group for appropriate belt routing.

You may also refer to the Belt Routing Label in the vehicle engine compartment.

(9) Install and tighten viscous fan shroud bolts to 4 N·m (31 in. lbs.).

(10) Install and tension the accessory drive belt, refer to Accessory Drive Belt removal and installation in this group.

(11) Install the electric cooling fan/shroud assy.

(12) Install and tighten electric fan shroud bolts to 4 N·m (31 in. lbs.). Connect fan connector.

Fig. 31 Water Pump Remove/Install-Typical
Fig. 31 Water Pump Remove/Install-Typical

1 - HEATER HOSE FITTING
2 - UPPER VENT HOLE
3 - PUMP GASKET
4 - WATER PUMP
5 - LOWER VENT HOLE
6 - LONG BOLT
7 - BOLTS (3) SHORT

(13) Fill cooling system with coolant and check for leaks. Refer to Refilling Cooling System in this group.

(14) Connect battery negative cable.

(15) Start and warm the engine. Check for leaks.

    More about «Removal and installation»:

    Transmission oil coolers

    Coolant reserve tank

    Water pump

    Thermostat

    Radiator-2.5L

    Radiator-4.0L

    Electric cooling fan-2.5L

    Electric cooling fan-4.0L

    Block heater

    Engine accessory drive belts

    Cooling system fans

    Viscous fan drive removal/ installation

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