| Coolant leakage |
- From the bleed hole of the water pump
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Visually check |
- 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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NOTE:
- Be careful not to mis repair because evaporate sediment caused by tiny vapor evaporation or a little coolant evaporation evidence can happen even when the water pump operates normal.
- Get rid of sediment in the air hole, and recheck there is leakage or not.
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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 |
- From bearings
- From mechanical seals
- Impeller interference
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Inspection with a stethoscope |
- 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 |
- 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 |
- Check water pump body and impeller interference.
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- If there is any interference between them, replace the water pump with a new one.
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| Overheating |
- Damaged impeller
- Loosened impeller
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Loosened impeller |
- Corroded impeller insert
- Replace the water pump if it is separated by corrosion between impellers and inserts
- Replace the water pump if there is a crack in the PL impeller.
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- Check engine coolant.
- Poor coolant quality/Maintenance check
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- Impeller separated from the shaft
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