Water Pump Replacement 4.3L Engine
Tools Required
J 41240 Fan Clutch Remover
and Installer
Removal Procedure
- Remove the air cleaner assembly. Refer to
Air Cleaner Assembly Replacement
in Engine Controls - 4.3L.
- Remove the air cleaner outlet resonator duct. Refer to
Air Cleaner Outlet Resonator Replacement
in Engine Controls -
4.3L.
- Drain the cooling system. Refer to
Cooling System Draining and Filling
.
- Remove the cooling fan. Refer to
Fan Replacement
.
- Remove the drive belt. Refer to
Drive Belt Replacement
in Engine Mechanical - 4.3L.
- Reposition
the radiator outlet hose clamps at the surge tank and water pump.
- Remove the radiator outlet hose from the surge tank.
- Remove the radiator outlet hose from the water pump.
- Reposition the water pump inlet hose clamps.
- Remove the water pump inlet hose.
- Using J 41240
to hold the water pump pulley, remove the water pump pulley bolts.
- Remove the water pump bolts.
- Remove the water pump.
- Remove and discard the water pump gaskets.
- Clean and inspect the water pump, if necessary. Refer to
Water Pump Cleaning and Inspection
in Engine Mechanical
- 4.3L. Unit Repair.
Installation Procedure
- If reusing the fasteners, apply sealant GM P/N 12346004 (Canadian P/N 10953480),
or equivalent to the threads of the water pump bolts.
Notice: Refer to Fastener Notice in the Preface section.
- Install NEW water pump gaskets and the water pump.
- Install the water pump bolts.
Tighten
Tighten the water pump bolts to 45 N·m
(33 lb ft).
- Using J 41240
to hold the water pump pulley, install the water pump pulley bolts.
Tighten
Tighten the water pump pulley bolts to 25 N·m
(18 lb ft).
Important: 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.
- Install the water pump inlet hose.
- Position the water pump inlet hose clamps.
- Install
the radiator outlet hose to the water pump.
- Install the radiator outlet hose to the surge tank.
- Position the radiator outlet hose clamps at the surge tank and water
pump.
- Install the drive belt. Refer to
Drive Belt Replacement
in Engine Mechanical - 4.3L.
- Install the cooling fan. Refer to
Fan Clutch Replacement
.
- Install the air cleaner outlet resonator duct. Refer to
Air Cleaner Outlet Resonator Replacement
in Engine Controls -
4.3L.
- Install the air cleaner assembly. Refer to
Air Cleaner Assembly Replacement
in Engine Controls - 4.3L.
- Fill the cooling system. Refer to
Cooling System Draining and Filling
.
- Inspect the cooling system for leaks.
Water Pump Replacement 4.8L, 5.3L, and 6.0L Engines
Removal Procedure
- Drain the cooling system. Refer to
Cooling System Draining and Filling
.
- Remove the air cleaner assembly. Refer to
Air Cleaner Assembly Replacement
in Engine Controls - 4.8L, 5.3L
and 6.0L.
- Remove the fan clutch. Refer to
Fan Clutch Replacement
.
- Remove the accessory drive belt. Refer to
Drive Belt Replacement - Accessory
.
- Reposition the inlet hose clamp at the water
pump.
- Remove the inlet hose from the water pump.
- Reposition the outlet hose clamp at the
water pump.
- Remove the outlet hose from the water pump.
- Reposition the heater inlet hose clamp at
the water pump.
- Remove the heater inlet hose from the water pump.
- Remove the water pump bolts.
- Remove the water pump and gaskets.
- Discard the water pump gaskets.
Installation Procedure
Important: All gaskets surfaces are to be free of oil or other foreign material during
assembly.
Notice: Refer to Fastener Notice in the Preface section.
- Install the water pump and NEW gaskets.
- Install the water pump bolts.
Tighten
- Tighten the water pump bolts a first pass to 15 N·m (11 lb ft).
- Tighten the water pump bolts a final pass to 30 N·m (22 lb ft).
- Install the heater inlet hose to the water
pump.
- Position the heater inlet hose clamp at the water pump.
- Install the outlet hose to the water pump.
- Position the outlet hose clamp at the water pump.
- Install the inlet hose to the water pump.
- Position the inlet hose clamp at the water pump.
- Install the accessory drive belt. Refer to
Drive Belt Replacement - Accessory
in Engine Mechanical - 4.8L,
5.3L, and 6.0L.
- Install the fan blade and clutch assembly. Refer to
Fan Clutch Replacement
.
- Install the air cleaner assembly. Refer to
Air Cleaner Assembly Replacement
in Engine Controls - 4.8L, 5.3L
and 6.0L.
- Fill the cooling system. Refer to
Cooling System Draining and Filling
.