Questionhow do I replace the waer pump?
AnswerREMOVAL
The water pump on all models can be removed without discharging the air conditioning system (if equipped).
The water pump on all gas powered engines is bolted directly to the engine timing chain case/cover.
On all 3.9L/5.2L/5.9L gas powered engines, 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 7 - COOLING/ENGINE/FAN DRIVE VISCOUS CLUTCH - DIAGNOSIS AND TESTING).
Disconnect negative cable from battery.
Drain cooling system (Refer to 7 - COOLING - STANDARD PROCEDURE).Do not waste reusable coolant. If solution is clean, drain coolant into a clean container for reuse.
Remove windshield washer reservoir tank from radiator fan shroud.
Disconnect the coolant reserve/overflow tank-to-radiator hose at the tank.
Remove the four fan shroud mounting bolts at the radiator (Typical Fan Shroud Mounting). Do not attempt to remove shroud from vehicle at this time.
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 a matching number or letter.
Remove upper radiator hose at radiator.
The thermal viscous fan drive is attached (threaded) to the water pump hub shaft (Fan Blade and Viscous Fan Drive - Typical). Remove the fan/fan drive assembly from water pump by turning the mounting nut counterclockwise (as viewed from front). Threads on the fan drive are RIGHT-HAND. A Snap-On 36 MM Fan Wrench (number SP346 from Snap-On Cummins Diesel Tool Set number 2017DSP) can be used with Special Tool 6958 Spanner Wrench and Adapter Pins 8346 (Using Special Tool 6958 Spanner Wrench and Adapter Pins 8346) to prevent the pulley from rotating.
If water pump is being replaced, do not unbolt fan blade assembly (Fan Blade and Viscous Fan Drive - Typical) from the thermal control fan drive.
Remove fan blade/fan drive and fan shroud as an assembly from vehicle.
After removing fan blade/fan drive assembly, do not place the thermal viscous fan drive in the horizontal position. If stored horizontally, the silicone fluid in the viscous drive could drain into its bearing assembly and contaminate the bearing lubricant.
Remove accessory drive belt (Refer to 7 - COOLING/ACCESSORY DRIVE/DRIVE BELTS - REMOVAL) (Belt Tensioner 5.9L V-8 Engine).
Remove the lower radiator hose and heater hose from water pump.
Loosen heater hose coolant return tube mounting bolt (Coolant Return Tube 5.9L) and remove tube from water pump. Discard the old tube O-ring.
Remove the seven water pump mounting bolts (Water Pump Bolts - 5.9L V-8 Gas Engine - Typical).
Loosen the clamp at the water pump end of bypass hose (Fan Blade and Viscous Fan Drive - Typical). Slip the bypass hose from the water pump while removing pump from vehicle. Do not remove the clamp from the bypass hose.
Discard old gasket.
CAUTION: Do not pry the water pump at timing chain case/cover. The machined surfaces may be damaged resulting in leaks.
