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