How to Replace the Water Pump on a 4L 93 Ford Ranger

The 1993 Ford Ranger with the 4.0-liter has a cooling fan that is driven by the water pump. Removal of the water pump requires removing the cooling fan, alternator, power steering pump and air-conditioning compressor (If equipped). To remove and install the fan and fan clutch, you need a fan clutch tool kit. This process would also be a good time to replace the accessory drive belt as it must also be removed.

Instructions

Removal

1

Lift the vehicle hood and support it with the hood prop rod. Ensure the engine has cooled completely and remove the coolant pressure cap slowly. Disconnect the negative battery cable with a wrench.

2

Place the drain pan under the passenger side of the radiator directly below the drain cock. Loosen the drain cock until the coolant begins to drain from the radiator. Allow the coolant to drain completely and tighten the drain cock. Dispose of the used coolant properly.

3

Release the pressure clamps for the coolant lines at the water pump and remove the lower radiator and heater return hose from the water pump. Remove the fan clutch and fan blade using the fan clutch holding tool and fan clutch nut wrench from the fan clutch tool set; rotate the holding nut clockwise until the fan and fan blade are loose and remove the fan clutch and blade from the engine.

4

Sketch out the pulley and belt routing for installation later. Place the 1/2-inch breaker bar into the hole on the belt tensioner and rotate clockwise. Remove the serpentine belt from the engine.

5

Remove the four bolts securing the a/c compressor and power steering bracket to the engine and remove the a/c compressor and power steering pump with the bracket and set it aside without disconnecting any lines.

6

Remove the two bolts holding the belt tensioner to the engine with the socket and ratchet. Remove the belt tensioner from the engine. Remove the three bolts securing the alternator bracket to the engine with the socket and ratchet and remove the alternator bracket with the alternator and set it aside.

7

Hold the water pump pulley in place with the water pump holding tool and remove the four pulley mounting bolts from the water pump pulley with the socket and ratchet. Remove the water pump bolts with the socket and ratchet and remove the water pump from the engine. Clean any old gasket material from the mating surface on the front engine cover with the wire brush.

Installation

8

Place the small bead of high temp silicone on both sides of the new water pump gasket and install the gasket onto the new water pump. Set the water pump onto the mating surface and the engine front cover and tighten two bolts to hand. Install the remaining bolts and tighten all bolts to 9 foot-pounds of torque with the torque wrench.

9

Place the water pump pulley onto the water pump and tighten the four mounting bolts to 20 foot-pounds of torque; use the water pump holding tool to hold the pump during the tightening sequence.

10

Install the alternator and alternator bracket to the engine and tighten the mounting bolts to 40 foot-pounds of torque with the torque wrench. When installing be sure not to twist or maneuver the alternator wires behind the bracket. Place the belt tensioner into position and install the mounting bolts, tightening the bolts to 40 foot-pounds of torque with the torque wrench.

11

Place the bracket with the a/c compressor and the power steering pump into position and hold it, making sure the a/c lines are not pinched or damaged when installing the bracket to the engine. Tighten the bracket to cylinder head bolts to 40 foot-pounds of torque and the two bracket to front cover bolts to 35 foot-pounds of torque.

12

Thread the fan blade and fan clutch onto the clutch shaft. Set the torque wrench to 45 foot-pounds and place the torque wrench into the hole on the holding tool and the fan clutch nut wrench onto the clutch nut. Rotate the nut counter-clockwise until the torque wrench clicks and remove the fan clutch tool set components.

13

Route the serpentine belt around the crankshaft, alternator, power steering and a/c compressor pulleys according to the routing sketch made previously. Rotate the belt tensioner clockwise and slide the belt under the tensioner pulley. Slowly rotate the tensioner back down until it rests naturally on the belt. Inspect the belt to make sure the routing is correct and there are no twists in the belt.

14

Install the lower radiator hose and heater outlet hose onto the new water pump and secure them with the pressure clamps.

15

Fill the radiator with new coolant until completely full. Allow the coolant to work its way through the radiator and then fill to the top again. Install the radiator cap fully and then back it off to the first stop. Turn the heater controls to high and start the engine, holding the engine between 2000 and 2500 rpm for four minutes and then shut the engine off.

16

Remove the radiator cap completely and fill the radiator with new coolant until full again. Start the engine and run at 2000 to 2500 rpm until the engine reaches normal operating temperature and the upper radiator hose is hot. Shut the engine off and fill the radiator again. Top off the coolant reservoir to the warm full line with new coolant and shut the vehicle hood.