4. COOLING SYSTEM
4-1
4. COOLING SYSTEM
FAULT OVERHAULING ······················ 4-1
COOLING SYSTEM TEST ··················· 4-2
THERMOSTAT ································· 4-3
RADIATOR AND CAP ························· 4-3
COOLANT TANK ······························ 4-5
RADIATOR FAN ································· 4-6
WATER PUMP HOUSING ··················· 4-6
WATER PUMP IMPELLER ··················· 4-7
WATER PUMP SHAFT AND SEALS ····· 4-7
WATER TEMPERATURE SENSOR ······· 4-11
Fault overhauling
1. If cover of radiator is open and temperature of cooling liquid is over 100℃, pressure of
cooling liquid will be reduced rapidly and boiled. Vapor injection may cause danger and
injuries. After drop of temperature of cooling liquid, use one cloth to cover the cover of
radiator and then slowly open the cover. Cooling liquid can only be tested after complete
cooling.
2. Cooling liquid is toxic. Do not drink it or splash it to skin, eyes or clothes. In case of
splashing cooling liquid to your eyes, use clean water to wash your eyes completely and
see the doctor. In case of splashing cooling liquid to your clothes, use soapy water to wash
it rapidly. In case of drinking cooling liquid, vomit will be caused immediately. Please see
the internist physician immediately. Store cooling liquid well and keep it out of reach of
children.
2. Check whether soil of fins is blocked or damaged. Correct curved fins. Use water and
compressed air to clean soil. If damaged area reaches 20%, please replace radiator.
3. Pump overhauling can be carried out before dismantling engine.
4. Only add cooling liquid to water tank in normal times. In addition to adding or exhausting
cooling liquid, please do not open cover of radiator.
5. Do not splash cooling liquid to plastic parts. Once splashed, please use clean water for
washing.
6. After dismantling cooling system, check leakage situation of joint.
Sharp rise of water temperature
z Faults of radiator cover
z There is air in cooling system
z Faults of water pump
z Faults of thermostat (thermostat is not open)
z Blockage of radiator tube or cooling tube
z Damage or blockage to radiator
z Incomplete cooling liquid
z Failure or faults of fan motor
No rise or slow rise of water temperature.
Z Faults of thermostat (thermostat is not closed)
Z Faults of line of water temperature display
Leakage of cooling liquid
z Faults of water seal
z Aging, damage or improper sealing to O-shaped ring
z Aging, damage or improper sealing to gasket
z Improper installation of pipe or hose
z Aging, damage or improper sealing to pipe and/or hose
WARNING！
Never start engine without coolant. Some engine parts such as the rotary seal on water pump shaft
can be damaged.
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