Water Pump: Service and Repair

Water Pump Replacement (LMM) (6.6L)

Removal Procedure





1. Remove the left wheelhouse inner panel. Refer to Front Wheelhouse Liner Replacement - Left Side (Chevrolet) Front Wheelhouse Liner Replacement - Left Side (GMC) .
2. Remove the thermostat housing crossover. Refer to Thermostat Housing Crossover Replacement (LMM) (Service and Repair) .
3. Remove the crankshaft balancer. Refer to Crankshaft Balancer Replacement (Service and Repair) .
4. Remove the water pump to engine coolant pipe nuts.
5. Remove the engine wiring harness retainer from the inner stud.




6. Remove the water pump bolts. Note the location of the bolts. The bolts are three different lengths.
7. Remove the water pump.
8. Remove and discard the water pump O-ring and coolant pipe gasket.
9. If required, clean and inspect the water pump. Refer to Water Pump Cleaning and Inspection (Overhaul) .



Installation Procedure





1. Lubricate the water pump O-ring with engine oil.
2. Install the engine coolant pipe gasket and water pump O-ring.
3. Install the water pump.
Notice: Refer to Fastener Notice .


4. Install the water pump bolts. Ensure the correct length bolt is used in the proper location.

Tighten the bolts to 21 N.m (15 lb ft).





5. Install the engine wiring harness retainer on the water pump outlet pipe inner stud.
6. Install the water pump to engine coolant pipe nuts.

Tighten the nuts to 21 N.m (15 lb ft).

7. Install the thermostat housing crossover. Refer to Thermostat Housing Crossover Replacement (LMM) (Service and Repair) .
8. Install the crankshaft balancer. Refer to Crankshaft Balancer Replacement (Service and Repair) .
9. Install the left wheelhouse inner panel. Refer to Front Wheelhouse Liner Replacement - Left Side (Chevrolet) Front Wheelhouse Liner Replacement - Left Side (GMC) .