Water Pump Replacement L18
Removal Procedure
- Drain the cooling system. Refer to
Cooling System Draining and Filling
.
- Remove the drive belt. Refer to
Drive Belt Replacement
for the 8.1L engine.
- Remove the fan clutch. Refer to
Fan Clutch Replacement
.
- Reposition the outlet hose clamp at the water pump.
- Remove the outlet hose from the water pump.
- Reposition the bypass hose clamps at the water pump and water crossover.
- Remove the bypass hose.
- Remove the water pump bolts.
- Remove the water pump.
- Remove and discard the water pump gaskets.
Installation Procedure
- Place NEW water pump gaskets into place.
Notice: Refer to Fastener Notice in the Preface section.
- Install the water pump.
- Install the water pump bolts.
Tighten
Tighten the water pump bolts to 50 N·m (37 lb ft).
- Install the bypass hose.
- Position the bypass hose clamps at the water pump and water crossover.
- Install the outlet hose to the water pump.
- Position the outlet hose clamp at the water pump.
- Install the fan clutch. Refer to
Fan Clutch Replacement
.
- Install the drive belt. Refer to
Drive Belt Replacement
for the 8.1L engine.
- Fill the cooling system. Refer to
Cooling System Draining and Filling
.
Water Pump Replacement Caterpillar
Refer to the Caterpillar® Service Manual.
Water Pump Replacement 6.6L
Removal Procedure
- Remove the thermostat housing crossover. Refer to
Thermostat Housing Crossover Replacement
.
- Remove the thermostat bypass pipe. Refer to
Thermostat Bypass Pipes Replacement
.
- Remove the crankshaft balancer. Refer to
Crankshaft Balancer Replacement
for the 6.6L (LLY) engine.
- Remove the water pump to engine coolant pipe nuts.
- Remove the engine wiring harness retainer from the inner stud.
- Remove the water pump bolts. Note the location of the bolts. The bolts are three different lengths.
- Remove the water pump.
- Remove and discard the water pump O-ring and coolant pipe gasket.
- If required, clean and inspect the water pump. Refer to
Water Pump Cleaning and Inspection
for the 6.6L (LLY) engine.
Installation Procedure
- Lubricate the water pump O-ring with engine oil.
- Install the engine coolant pipe gasket and water pump O-ring.
Notice: Refer to Fastener Notice in the Preface section.
- Install the water pump.
- Install the water pump bolts. Ensure the correct length bolt is used in the proper location.
Tighten
Tighten the bolts to 21 N·m (15 lb ft).
- Install the engine wiring harness retainer on the water pump outlet pipe inner stud.
- Install the water pump to engine coolant pipe nuts.
Tighten
Tighten the nuts to 21 N·m (1 lb ft).
- Install the thermostat bypass pipe. Refer to
Thermostat Bypass Pipes Replacement
.
- Install the thermostat housing crossover. Refer to
Thermostat Housing Crossover Replacement
.
- Install the crankshaft balancer. Refer to
Crankshaft Balancer Replacement
for the 6.6L (LLY) engine.
Water Pump Replacement 7.8L
Removal Procedure
- Drain the coolant. Refer to
Cooling System Draining and Filling .
- Remove the drive belt from the water pump pulley. Refer to
Drive Belt Replacement .
- Remove the fan clutch and adapter. Refer to
Fan Clutch Replacement .
- Remove the following components from the water pump:
- Remove the bolts from the water duct.
- Remove the following components:
- Remove the water pump bolts.
- Remove the following components:
- Clean the following components:
• | The surface of the water pump |
• | The surface of the engine block |
• | The water duct sealing surfaces |
- Inspect the following components for wear, deterioration or corrosion.
Replace the components as necessary:
Installation Procedure
- Install new gaskets to the water pump.
- Install the water pump to the engine block.
Notice: Refer to Fastener Notice in the Preface section.
- Install the water pump bolts.
Tighten
Tighten the water pump bolts to 19 N·m (14 lb ft).
- Lube the O-ring with soap suds.
- Install the following components:
- Install the water duct bolts.
Tighten
- Tighten the M8 bolt to 19 N·m (14 lb ft).
- Tighten the M16 bolt to 125 N·m (92 lb ft).
- Install the following components to the water pump:
Tighten
Tighten the clamp to 5 N·m (44 lb in).
- Install the adapter (2) to the pump.
Tighten
Tighten the adapter bolts to 68 N·m (50 lb ft).
- Install the fan clutch. Refer to
Fan Clutch Replacement .
- Install the drive belt. Refer to
Drive Belt Replacement .
- Fill the cooling system. Refer to
Cooling System Draining and Filling .
- Inspect the system for leaks.