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. |
|
