Symptoms
| Possible Causes
| Remedy
|
Coolant leakage
|
| • |
From the bleed hole of the water pump |
| Visually check
|
| • |
Check leaks after about ten-minute warming up. |
|
| • |
If coolant still leaks, replace a water pump. |
|
| • |
If leakage stops, reuse the water pump (Do not replace the pump with a new one). |
|
| • |
From gaskets or bolts |
|
| • |
Check the tightening of the water pump mounting bolts. |
|
| • |
Retighten the mounting bolts. |
|
| • |
Check damage of gaskets or inflow of dust. |
|
| • |
Replace the gasket and clean dust off. |
|
| • |
From outer surface of water pump |
|
| • |
Check the material or any cracks of the water pump. |
|
| • |
Poor material. If any crack found, replace the water pump. |
|
Noise
|
| • |
From mechanical seals |
| • |
Impeller interference |
| Inspection with a stethoscope
|
| • |
After starting the engine, check noise with a stethoscope. |
|
| • |
If there is no noise, reuse the water pump (do not replace it). |
|
| • |
If there is any noise from the water pump, remove the drive belt and recheck. |
|
Inspection after removing a drive belt
|
| • |
After removing a water pump and a drive belt, check noise again. |
|
| • |
If there is noise, reuse the water pump. Check other drive line parts. |
|
| • |
If there is no noise, replace the water pump with a new one. |
|
Inspection after removing a water pump
|
| • |
After removing a water pump and a drive belt, check noise again. |
|
| • |
If there is any interference between them, replace the water pump with a new one. |
|
Overheating
|
| Loosened impeller
|
| • |
Corrosion of the impeller wing |
|
| • |
Check engine coolant. |
| • |
Poor coolant quality / Maintenance check |
|
| • |
Impeller seperation from the shaft |
|
| • |
Replace the water pump. |
|
Water pump Repair procedures
Thermostat Repair procedures