- Remove the old gasket material from the water pump sealing surfaces.
Refer to
Replacing Engine Gaskets
in Engine Mechanical
- 4.3L.
- Clean all of the excess dirt and the debris from the water pump
housing.
- Inspect the water pump for the following conditions:
| • | The gasket sealing surfaces for excessive scratches or gouging |
| • | Restrictions within the internal coolant passages |
| • | Excessive side-to-side play in the pulley shaft |
| • | Leakage at the water outlet housing or the rear cover gasket |
| • | Leakage at the water pump vent hole |
| • | A stain around
the vent hole is acceptable. If leakage occurs (dripping) with the engine
running and the cooling system pressurized, replace the water pump.
Refer to
Water Pump Replacement
. |
- Inspect the water pump
pulley for wear or damage in the belt tracking area.
