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ENGINE INTRODUCTION (J08E)
EN01–4
TROUBLESHOOTING
EN0110601F300001
Engine overheating
Symptom
Possible cause
Remedy/Prevention
Engine overheating (Coolant)
Insufficient coolant
Add coolant
Defective thermostat
Replace thermostat
Overflow of coolant due to leakage of
exhaust into cooling system
Repair
Damaged rubber hose
Replace rubber hose
Coolant leakage due to deteriorated
rubber hose
Replace rubber hose
Coolant leakage from coolant pump
Replace the coolant pump
Coolant leakage from rubber hose con-
nection
Retighten or replace clamp
Coolant leakage from cylinder head
gasket
Replace gasket
Engine overheating (Coolant pump)
Bearing seizure
Replace
Damaged (corroded) vane
Replace vane
Engine overheating (Radiator)
Clogged with rust or scale
Clean radiator
Clogged with iron oxide due to leakage
of exhaust into cooling system
Clean coolant passage and correct
exhaust leakage
Coolant leakage
Repair or replace radiator
Damaged cooling fan
Replace cooling fan
Clogged radiator core due to mud or
other debris
Clean radiator
Defective radiator cap pressure valve
Replace radiator cap
Engine overheating (Abnormal com-
bustion)
Poor fuel
Use good quality fuel
Breakdown of injector
Replace the injector
Engine overheating (Other prob-
lems)
Defective or deteriorated engine oil
Change engine oil
Unsatisfactory operation of oil pump
Replace or repair
Insufficient oil
Add oil
Brake drag
Repair or adjust
Break water temperature sensor
Replace it
Engine overheating (Severe operat-
ing condition)
Lugging the engine
Operate engine properly