Water Pump: Testing and Inspection
INSPECTION1) Check water pump bearing for smooth rotation.
2) Check water pump pulley for abnormalities.
3) Using a dial gauge, measure impeller runout in thrust direction while rotating the pulley.
Thrust runout limit. 0.5 mm (0.020 inch)
4) Check clearance between impeller and pump case.
Clearance between impeller and pump case:
Standard 0.5 - 0.7 mm (0.020 - 0.028 inch)
Limit 1.0 mm (0.039 inch)
5) After water pump installation, check pulley shaft for engine coolant leaks. If leaks are noted, replace water pump assembly.