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). |
|
|
|
| • |
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
|
|
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
|
|
Loosened impeller
|
| • |
Corrosion of the impeller
wing |
|
| • |
Poor coolant quality
/ Maintenance check |
|
| • |
Impeller seperation from
the shaft |
|
| • |
Replace the water pump. |
|
See also:
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