TROUBLESHOOTING
14-5
1.4 Overheating
1.4.1 Check items before troubleshooting
(1) Quantity and leakage of coolant
(2) Loosening of fan belt
(3) Clogging of radiator fins
(4) Concentration of LLC
(5) Clogging of muffler
(6) Quantity and degradation of engine oil
(7) Swirling of cooling air
(8) Thermostat malfunction
1.4.2 Problem: Overheating
Overheat often occurs by engine load mismatching when the engine is set up.
If the engine itself is normal and overheat occurs, measure the ambient and coolant temperatures in the loaded condition
(thermostat full open).
If the temperature difference is greater than 60°C [140°F], the investigation into other components as well as the engine is
suggested.
Problem: Overheating
Does the engine run continuously under overload?
Examine the cause of load
Repair cooling system
Adjust fuel injection timing
NO
YES
YES
NO
NO
Is the cooling system normal
(blow-by of cylinder head gasket, clogging of water pump,
water hose and radiator, and faulty thermostat)?
Is the fuel injection timing
normal?
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