Symptoms | Possible Causes | Remedy | ||
Coolant leakage | From the bleed hole of the water pump | Visually check for efflorescence | 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). caution Fine vapor leakage can cause efflorescence. Therefore do not replace water pump only for efflorescence. |
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 bearings • 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 | • Damaged impeller • Loosened impeller | Inspection after removing a water pump | Corrosion of the impeller wing | • Check engine coolant. - Poor coolant quality (rust) / Maintenance check - Improper used water (underground water, mineral water and etc.) • Check for coolant lack, overheat, air - Additional inspection |
Impeller separation from the shaft | Replace the water pump. | |||
