12. COOLING SYSTEM K-XCT 125i
SERVICE INFORMATION
GENERAL INSTRUCTIONS
The water pump must be serviced after removing the engine. Other cooling system service can be
done with the engine installed in the frame.
The engine must be cool before servicing the cooling system.
When the coolant temperature is over 100, never remove the radiator cap to release the
pressure because the boiling coolant may cause danger.
Avoid spilling coolant on painted surfaces because the coolant will corrode the painted surfaces.
Wash off any spilled coolant with fresh water as soon as possible.
After servicing the system, check for leaks with a cooling system tester.
SPECIAL TOOL
Mechanical seal driver
TORQUE VALUES
Water pump impeller 1.2 kgf-m (12 N-m, 9 lbf-ft) Left hand threads
Water pump cover bolt 1.0 kgf-m (10 N-m, 7 lbf-ft)
TROUBLESHOOTING
Engine temperature too high Coolant leaks
Faulty temperature gauge or thermosensor Faulty pump mechanical (water) seal
Faulty radiator cap Deteriorated O-rings
Faulty thermostat Damaged or deteriorated water hoses
Insufficient coolant
Passages blocked in hoses or water jacket
Clogged radiator fins
Passages blocked in radiator
Faulty water pump
Temperature gauge pointer does not register
the correct coolant temperature
Faulty temperature gauge or thermosensor
Faulty thermostat
12-1
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