Isuzu AA-6HK1T, Workshop Manual

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GENERAL INFORMATION 0A–29
Condition Possible Cause Correction
Overheating Insufficient coolant
Defective pressure cap or clogged
radiator core
Defective water pump
Defective sealing cap resulting in the
cooling water leakage
Defective thermostat
Cooling system clogged by foreign
material
Fuel injection timing improperly
adjusted
Replenish coolant
Replace the radiator pressure cap or
clean radiator core
Repair or replace the water pump
Replace the sealing cap
Replace the thermostat
Remove foreign material from the
cooling system
Adjust the fuel injection timing
6. Engine Cooling Trouble
Condition Possible Cause Correction
Trouble in the fuel system
Low compression pressure
Trouble in the cooling system
Trouble in the turbocharger
system
Water particles in fuel
Retarded fuel injection timing
Blown out cylinder head gasket
Worn cylinder liner
Piston ring sticking or broken
Improper seating between the valve and
valve seat.
Defective thermostat
Defective turbocharger
Replace the fuel
Adjust the fuel injection timing
Replace the related parts
Replace the thermostat
Repair or replace
Condition Possible Cause Correction
Trouble in the fuel system
Trouble in the fuel injection
system
Trouble in the valve train
Clogged air cleaner element
Injection nozzle starting pressure tool
low
Improper spray condition
Advanced fuel injection timing
Excessive injection volume
Worn camshaft lobe
Clean or replace the air cleaner element
Adjust or replace the injection nozzle
Adjust the fuel injection timing
Adjust the injection volume
Replace the camshaft
8. Black Exhaust Smoke
7. White Exhaust Smoke