Dodge Durango (DN) 1998-2003 Service Manual » Cooling System » Removal and installation »

Water pump 4.7L engines

The water pump on 4.7L engines is bolted directly to the engine timing chain case/cover.

A gasket is used as a seal between the water pump and timing chain case/cover.

If water pump is replaced because of bearing/shaft damage, or leaking shaft seal, the mechanical cooling fan assembly should also be inspected. Inspect for fatigue cracks, loose blades, or loose rivets that could have resulted from excessive vibration. Replace fan if any of these conditions are found. Also check condition of the thermal viscous fan drive. Refer to Viscous Fan Drive in this group.

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

Fig. 32 Belt Routing-5.2L/5.9L Engines

1 - IDLER PULLEY

2 - GENERATOR PULLEY

3 - A/C COMPRESSOR PULLEY

4 - IF W/OUT A/C

5 - POWER STEERING PUMP PULLEY

6 - WATER PUMP PULLEY

7 - CRANKSHAFT PULLEY

8 - AUTOMATIC TENSIONER

REMOVAL

(1) Disconnect negative battery cable from battery.

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

Do not waste reusable coolant. If solution is clean, drain coolant into a clean container for reuse.

(3) The thermal viscous fan drive is attached (threaded) to the water pump hub shaft. Remove fan/ viscous fan drive assembly from water pump by turning mounting nut counterclockwise as viewed from front. Threads on viscous fan drive are RIGHT HAND. Using special tool spanner wrench 6958 with adapter pins 8346 and a suitable fan wrench loosen the fan drive (Fig. 33). Do not attempt to remove fan/ viscous fan drive assembly from vehicle at this time.

Fig. 33 Viscous Fan and Fan Drive 4.7L

1 - SPECIAL TOOL 6958 SPANNER WRENCH WITH ADAPTER PINS 8346

2 - FAN

WARNING: CONSTANT TENSION HOSE CLAMPS ARE USED ON MOST COOLING SYSTEM HOSES.

WHEN REMOVING OR INSTALLING, USE ONLY TOOLS DESIGNED FOR SERVICING THIS TYPE OF CLAMP, SUCH AS SPECIAL CLAMP TOOL (NUMBER 6094). SNAP-ON CLAMP TOOL (NUMBER HPC-20) MAY BE USED FOR LARGER CLAMPS. ALWAYS WEAR SAFETY GLASSES WHEN SERVICING CONSTANT TENSION CLAMPS.

CAUTION: A number or letter is stamped into the tongue of constant tension clamps. If replacement is necessary, use only an original equipment clamp with matching number or letter.

(4) If water pump is being replaced, do not unbolt fan blade assembly from thermal viscous fan drive.

(5) Remove two fan shroud-to-radiator screws (Fig.

34). Disconnect the coolant overflow hose, windshield washer fluid hose and washer pump electrical connector.

(6) Remove upper fan shroud and fan blade/viscous fan drive assembly from vehicle.

(7) 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.

(8) Remove accessory drive belt as follows: The drive belt is equipped with a spring loaded automatic belt tensioner. Relax tension from belt by rotating tensioner clockwise (as viewed from front) (Fig. 35).

When all belt tension has been relaxed, remove accessory drive belt.

(9) Remove lower radiator hose clamp and remove lower hose at water pump.

(10) Remove seven water pump mounting bolts and one stud bolt.

Fig. 34 Upper Fan Shroud, Coolant reservoir and Washer Fluid Reservoir

1 - RADIATOR

2 - WASHER FLUID RESERVOIR

3 - COOLANT OVERFLOW/RESERVOIR

4 - FAN SHROUD (UPPER)

5 - SCREW

6 - INTERLOCKING PINS

7 - FAN SHROUD (LOWER)

CAUTION: Do not pry water pump at timing chain case/cover. The machined surfaces may be damaged resulting in leaks.

(11) Remove water pump and gasket. Discard gasket.

INSTALLATION

(1) Clean gasket mating surfaces.

(2) Using a new gasket, position water pump and install mounting bolts as shown. (Fig. 36). Tighten water pump mounting bolts to 54 N*m (40 ft. lbs.) torque.

(3) Spin water pump to be sure that pump impeller does not rub against timing chain case/cover.

(4) Connect radiator lower hose to water pump.

(5) Relax tension from belt tensioner (Fig. 35).

Install drive belt.

Fig. 35 Automatic Belt Tensioner-4.7L

1 - AUTOMATIC TENSIONER

2 - WATER PUMP PULLEY

Fig. 36 Water Pump Installation-4.7L

1 - WATER PUMP

2 - TIMING CHAIN COVER

CAUTION: When installing the serpentine accessory drive belt, belt must be routed correctly. If not, engine may overheat due to water pump rotating in wrong direction. Refer to (Fig. 37) for correct belt routing. Or, refer to the Belt Routing Label located in the engine compartment. The correct belt with correct length must be used.

Fig. 37 Belt Routing 4.7L