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 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 | Loosened impeller | ● Corrosion of the impeller wing | ● Check engine coolant. ● Poor coolant quality / Maintenance check |
● Impeller seperation from the shaft | ● Replace the water pump. | |||
