Removal
The water pump on all 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.
1. Disconnect negative battery cable from battery.
2. Drain cooling system.
3. Do not waste reusable coolant. If solution is clean, drain coolant into a clean container for reuse.
4. Remove the plastic air cleaner intake tube.
5. Remove two-piece fan shroud. Remove lower half first.
Hose Clamp Tool - Typical:
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.
Clamp Number/Letter Location:
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.
6. Remove upper radiator hose at radiator.
Fan Blade/Viscous Fan Drive Assembly:
7. The thermal viscous fan drive is attached (threaded) to the water pump hub shaft. 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 RAND. A Snap-On 36 MM Fan Wrench (number SP346 from Snap-On Cummins Diesel Tool Set number 2017D5P) can be used. Place a bar or screwdriver between the water pump pulley bolts to prevent the pulley from rotating.
8. If water pump is being replaced, do not unbolt fan blade assembly from the thermal viscous fan drive.
9. Remove fan blade/fan drive assembly from vehicle.
10. 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.
11. Do not remove the water pump pulley bolts at this time.
Automatic Belt Tensioner - Typical:
12. Remove accessory drive belt as follows: The drive belt is equipped with a spring loaded automatic belt tensioner. Relax the tension from the belt by rotating the tensioner clockwise (as viewed from front). When all belt tension has been relaxed, remove accessory drive belt.
13. Remove the four water pump pulley-to-water pump hub bolts and remove pulley from engine.
14. Remove the lower radiator hose at water pump.
Coolant Return Tube - Typical:
15. Loosen heater hose coolant return tube mounting bolt and remove tube from water pump. Discard the old tube O-ring.
Water Pump Bolts - Typical:
16. Remove the seven water pump mounting bolts.
17. Loosen the clamp at the water pump end of bypass hose. Slip the bypass hose from the water pump while removing pump from engine. Do not remove the clamp from the bypass hose.
18. Discard old gasket.
CAUTION: Do not pry the water pump at timing chain case/cover. The machined surfaces may be damaged resulting in leaks.