Water Pump Replacement LU3

Special Tools

J 41240 Fan Clutch Remover and Installer

Removal Procedure

1. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Resonator Replacement.
2. Remove the drive belt. Refer to Drive Belt Replacement.
3. Drain the cooling system. Refer to Cooling System Draining and Filling.
4. Reposition the radiator outlet hose clamps at the surge tank and water pump.
5. Remove the radiator outlet hose from the surge tank.
6. Remove the radiator outlet hose from the water pump.



7. Reposition the water pump inlet hose clamps.
8. Remove the water pump inlet hose.



9. Using J 41240 , hold the water pump pulley, remove the water pump pulley bolts.



10. Remove the water pump bolts.
11. Remove the water pump.
12. Remove and discard the water pump gaskets.
13. Clean and inspect the water pump, if necessary. Refer to Water Pump Cleaning and Inspection.

Installation Procedure

1. If reusing the old fasteners, apply sealant GM P/N 12346004, (Canadian P/N 10953480), or equivalent to the threads of the water pump bolts.
2. Install NEW water pump gaskets and the water pump.

Caution: Refer to Fastener Caution in the Preface section.

3. Install the water pump bolts.

Tighten
Tighten the bolts to 45 N·m (33 lb ft).




4. Using J 41240 , hold the water pump pulley, install the water pump pulley bolts.

Tighten
Tighten the bolts to 25 N·m (18 lb ft).





Note: After assembly, the hose clamp tangs (water pump end) must point forward and the upper tang should be level with the outside diameter of the water pump inlet hose.

5. Install the water pump inlet hose.
6. Position the water pump inlet hose clamps.



7. Install the radiator outlet hose to the water pump.
8. Install the radiator outlet hose to the surge tank.
9. Position the radiator outlet hose clamps at the surge tank and water pump.
10. Install the drive belt. Refer to Drive Belt Replacement.
11. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Resonator Replacement.
12. Fill the cooling system. Refer to Cooling System Draining and Filling.
13. Inspect the cooling system for leaks.

Water Pump Replacement LMM

Removal Procedure

1. Remove the left wheelhouse inner panel. Refer to Front Wheelhouse Liner Replacement - Left Side.
2. Remove the thermostat housing crossover. Refer to Thermostat Housing Crossover Replacement.
3. Remove the crankshaft balancer. Refer to Crankshaft Balancer Replacement.
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.

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.

Caution: Refer to Fastener Caution in the Preface section.

4. 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).




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

7. Install the thermostat housing crossover. Refer to Thermostat Housing Crossover Replacement.
8. Install the crankshaft balancer. Refer to Crankshaft Balancer Replacement.
9. Install the left wheelhouse inner panel. Refer to Front Wheelhouse Liner Replacement - Left Side.

Water Pump Replacement LH6, LY2, LY5, and LMG

Removal Procedure

1. Remove the air cleaner outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement.
2. Drain the cooling system. Refer to Cooling System Draining and Filling.
3. Reposition the radiator vent inlet hose clamp (1) at the coolant air bleed pipe fitting.
4. Remove the radiator vent inlet hose (2) from the coolant air bleed pipe fitting.



5. Reposition the radiator inlet hose clamp (3) at the water pump.
6. Remove the radiator inlet hose from the water pump.
7. Reposition the radiator inlet hose and vent inlet hose out of the way.
8. Remove the accessory drive belt. Refer to Drive Belt Replacement - Accessory.



9. Reposition the radiator outlet hose clamp at the water pump.
10. Remove the radiator outlet hose from the water pump.
11. Reposition the outlet hose out of the way.



12. Reposition the radiator surge tank outlet hose clamp (1) at the water pump.
13. Remove the radiator surge tank outlet hose (2) from the water pump.
14. Reposition the outlet hose out of the way.



15. Reposition the heater inlet hose clamp (1) at the water pump.
16. Remove the heater inlet hose (2) from the water pump.
17. Reposition the inlet hose out of the way.



18. Remove the water pump bolts (301).
19. Remove the water pump (300) and gaskets (309). Discard the gaskets.

Installation Procedure

Caution: DO NOT use cooling system seal tabs, or similar compounds, unless otherwise instructed. The use of cooling system seal tabs, or similar compounds, may restrict coolant flow through the passages of the cooling system or the engine components. Restricted coolant flow may cause engine overheating and/or damage to the cooling system or the engine components/assembly.

Note: All gaskets surfaces are to be free of oil or other foreign material during assembly.

1. Position the water pump (300) and NEW gaskets (306) to the engine block.

Caution: Refer to Fastener Caution in the Preface section.

2. Install the water pump bolts (301).

Tighten

1. Tighten the bolts a first pass to 15 N·m (11 lb ft).
2. Tighten the bolts a final pass to 30 N·m (22 lb ft).



3. Position and install the heater inlet hose (2) to the water pump.
4. Position the heater inlet hose clamp (1) at the water pump.



5. Position and install the radiator surge tank outlet hose (2) to the water pump.
6. Position the radiator surge tank outlet hose clamp (1) at the water pump.



7. Position and install the radiator outlet hose to the water pump.
8. Position the radiator outlet hose clamp at the water pump.
9. Install the accessory drive belt. Refer to Drive Belt Replacement - Accessory.



10. Position the radiator inlet hose and vent inlet hose to the correct position.
11. Install the radiator inlet hose to the water pump.
12. Position the radiator inlet hose clamp (3) at the water pump.



13. Install the radiator vent inlet hose (2) to the coolant air bleed pipe fitting.
14. Position the radiator vent inlet hose clamp (1) at the coolant air bleed pipe fitting.
15. Fill the cooling system. Refer to Cooling System Draining and Filling.
16. Install the air cleaner outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement.

Water Pump Replacement LY6, L76, and L92

Removal Procedure

1. Remove the air cleaner outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement.
2. Drain the cooling system. Refer to Cooling System Draining and Filling.
3. Reposition the radiator vent inlet hose clamp (1) at the coolant air bleed pipe fitting.
4. Remove the radiator vent inlet hose (2) from the coolant air bleed pipe fitting.



5. Reposition the radiator inlet hose clamp (3) at the water pump.
6. Remove the radiator inlet hose from the water pump.
7. Reposition the radiator inlet hose and vent inlet hose out of the way.
8. Remove the accessory drive belt. Refer to Drive Belt Replacement - Accessory.



9. Reposition the radiator outlet hose clamp at the water pump.
10. Remove the radiator outlet hose from the water pump.
11. Reposition the outlet hose out of the way.



12. Reposition the radiator surge tank outlet hose clamp at the water pump (1).
13. Remove the radiator surge tank outlet hose (2) from the water pump.
14. Reposition the outlet hose out of the way.



15. Reposition the heater inlet hose clamp (1) at the water pump.
16. Remove the heater inlet hose (2) from the water pump.
17. Reposition the inlet hose out of the way.



18. Remove the water pump bolts (301).
19. Remove the water pump (300) and gaskets (309). Discard the gaskets.

Installation Procedure

Caution: DO NOT use cooling system seal tabs, or similar compounds, unless otherwise instructed. The use of cooling system seal tabs, or similar compounds, may restrict coolant flow through the passages of the cooling system or the engine components. Restricted coolant flow may cause engine overheating and/or damage to the cooling system or the engine components/assembly.

Note: All gaskets surfaces are to be free of oil or other foreign material during assembly.

1. Inspect the drained coolant for sand or other debris, flush the system as needed. Refer to Flushing.
2. Inspect and clear the radiator vent hose fitting, if necessary.

There is a small 2.0 mm (0.080 in) orifice (vent hose fitting) in the neck of the radiator where the coolant vent hose from the engine attaches to the radiator.

3. Position the water pump (300) and NEW gaskets (306) to the engine block.

Caution: Refer to Fastener Caution in the Preface section.

4. Install the water pump bolts (301).

Tighten

1. Tighten the bolts a first pass to 15 N·m (11 lb ft).
2. Tighten the bolts a final pass to 30 N·m (22 lb ft).



5. Position and install the heater inlet hose (2) to the water pump.
6. Position the heater inlet hose clamp (1) at the water pump.



7. Position and install the radiator surge tank outlet hose (2) to the water pump.
8. Position the radiator surge tank outlet hose clamp at the water pump (1).



9. Position and install the radiator outlet hose to the water pump.
10. Position the radiator outlet hose clamp at the water pump.
11. Install the accessory drive belt. Refer to Drive Belt Replacement - Accessory.



12. Position the radiator inlet hose and vent inlet hose to the correct position.
13. Install the radiator inlet hose to the water pump.
14. Position the radiator inlet hose clamp (3) at the water pump.



15. Install the radiator vent inlet hose (2) to the coolant air bleed pipe fitting.
16. Position the radiator vent inlet hose clamp (1) at the coolant air bleed pipe fitting.
17. Fill the cooling system. Refer to Cooling System Draining and Filling.
18. Install the air cleaner outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement.