Produced from 1998 to early 2003, the Ford 7.3 turbo diesel has a well-known reputation for being a workhorse. The large diesel engine's abilities range from hauling luxury fifth-wheel travel trailers to getting down and dirty on the muddy road to a remote oil rig. These kinds of demands require that you maintain your engine on a regular basis. A puddle of coolant underneath your truck is a good indication that a water pump replacement is in your future.
Things You'll Need
- Water pump
- 4 gallons antifreeze
- 4 gallons distilled water
- 1 bottle diesel coolant conditioner
- Fan nut wrench
- Wrenches, assorted sizes
- 3/8-inch drive ratchet
- Drain pan
Loosen the coolant reservoir cap. Place a drain pan under the left side of the radiator and loosen the radiator drain petcock. Retighten the drain petcock after all of the coolant has drained from the radiator. Remove the lug wrench from the top of the radiator. Remove the attaching bolts from the coolant reservoir tank. Disconnect the upper coolant hose and the lower radiator hose from the coolant tank. Remove the coolant tank from the engine bay.
Loosen the large nut attaching the fan to the water pump pulley, using the fan nut wrench to turn the nut counterclockwise. Remove the upper radiator hose and the bolts holding the fan shroud. Lift the fan shroud and the fan assembly together out of the engine bay and set aside.
Loosen but do not remove the four bolts holding the water pump pulley. Use a 3/8-inch drive ratchet wrench to relieve the pressure on the belt tensioner and remove the serpentine belt. Finish backing out the four pulley bolts and remove the pulley. Remove the camshaft and coolant sensor wiring plugs and move them aside. Remove the four bolts holding the upper coolant hose onto the water pump. Remove the clamp holding the heater hose onto the water pump and remove the hose.
Loosen and remove the nine attaching bolts from the water pump and remove the water pump from the engine bay. Remove the coolant temperature sensor and the thermostat from the old water pump and install them onto the new water pump using thread sealant. Install the metal coolant tube onto the new water pump. Install the “O” ring onto the back of the water pump and apply sealant.
Reattach the new water pump to the engine block using the nine attaching bolts. Reconnect the heater hose, upper radiator hose, and the coolant and camshaft sensor plugs. Install the water pump pulley, leaving the four attaching bolts loose. Reinstall the serpentine belt and tighten the four pulley bolts. Lift the fan shroud and fan into the engine bay. Reattach the fan shroud bolts. Using the fan nut wrench, reattach the fan to the water pump pulley.
Reinstall the coolant tank and upper and lower radiator hoses. Remove the cap from the coolant tank and add 4 gallons of antifreeze, 4 gallons of distilled water, and one bottle of coolant conditioner. Screw the cap back onto the coolant tank and start the engine. Allow engine to run a few minutes and check for leaks. Tighten any connections as needed. Add more coolant if the level is not between the minimum and maximum marks on the coolant tank.
Tips & Warnings
- The fan nut wrench can be rented from an auto parts store.
- While replacing your water pump, a good proactive measure would be to replace the coolant sensor, thermostat, serpentine belt, and radiator hoses.
How to Replace a Powerstroke Fuel Pump
When Ford introduced the new body-style F-250 trucks, they soared in popularity, partially because of the super-powerful Powerstroke diesel engine. Routine maintenance...
How to Remove a Water Pump on a Ford F-250 7.3
The 7.3-liter diesel V-8 engine in your Ford F-250 utilizes a heavy-duty water pump to circulate antifreeze through the radiator and coolant...
How to Remove the Fan From a 7.3 Diesel
The 7.3-liter diesel engine was manufactured by International Harvester and was used in heavy-duty Ford pickup trucks from the late 1980s to...
How to Replace the Fuel Pump On a 7.3 Diesel
The 7.3-liter Power Stroke diesel engine was installed in the F-250, F-350 and Ford Excursion starting in 1988, with a turbo version...
How to Replace a 7.3L Fuel Pump
A 7.3-liter engine is most common in Ford Super Duty trucks manufactured from 1995 to 2002. These vehicles have a Ford Power...
How to Replace a Water Pump
A water pump, whether on a car, truck or yard equipment, will malfunction after time, whether it is a leak or the...