KYMCO MXU 300 -, User Manual

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12
. COOLING SYSTEM
12-1
MXU 300/250
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 Nm, 8.6 lbf-ft) Left thread
Water pump cover bolt 1 kgf-m (10 Nm, 7.2 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