Water Pump: Testing and Inspection

C: INSPECTION
1. 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.