| Symptoms |
POSSIBLE CAUSES |
REMEDY |
| Coolant Leakage |
- From the water pump drain hole
|
VISUAL INSPECTION |
- Check for leaks during a 10-minute warm-up.
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- If the coolant continues to leak, replace the water pump.
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- If the leak is repaired, reuse the water pump. (Do not replace the pump.)
|
- From the gaskets or bolts
|
- Check the tightening torque of the water pump mounting bolts.
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- Tighten the mounting bolts.
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- Check for damaged seals or dust.
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- Replace the gasket and wipe off the dust.
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- From the outer surface of the water pump
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- Check the water pump for material defects or cracks.
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- Replace the water pump if there is a material defect or cracks.
|
| Noise |
- Seating
- From the mechanical seals
- Impeller interference
|
Check using a stethoscope |
- After starting the engine, check for noise with a stethoscope.
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- If there is no noise, reuse the water pump (without replacing it).
|
- If the noise comes from the water pump, remove the drive belt and check again.
|
| Inspection after drive belt removal |
- After removing the water pump and drive belt, check the noise again.
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- If there is noise, replace the water pump. Check the other drive shaft components.
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- If there is no noise, reinstall the water pump with a new one.
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| Inspection after water pump removal |
- After removing the water pump and drive belt, check the noise again.
|
- If there is no interference between them, replace the pump with a new one.
|
| Overheated |
- Damaged impeller
- Loose rotor
|
Loose impeller |
|
- Check the engine coolant.
- Poor coolant quality / maintenance
|
- Impeller separated from shaft
|
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