Overheating; White Exhaust Smoke - Isuzu 4JB1 Service Information

00 – 10 SERVICE INFORMATION
Checkpoint
Cooling water
Fan clutch
Fan belt
Radiator
Water pump
Cylinder head and
cylinder body sealing
cap
Thermostat
Cooling system
Fuel injection timing
Checkpoint
Cooling water
Fuel
Fuel injection timing
Compression pressure
Inlet and exhaust valve
Valves seals

6. OVERHEATING

Possible cause
Insufficient cooling water
Oil leakage from the fan clutch
Fan belt loose or cracked causing slippage
Defective radiator cap or clogged radiator
core
Defective water pump
Defective sealing cap resulting in water
leakage
Defective thermostat
Cooling system clogged by foreign material
Fuel injection timing improperly adjusted

7. WHITE EXHAUST SMOKE

Possible cause
Insufficient cooling water
Water particles in the fuel
Delayed fuel injection timing
Blown out cylinder head gasket. Worn
cylinder liner.
Piston ring sticking
Defective valve seals.
Worn valves stems and valve guides
Correction
Replenish the cooling water
Replace the fan clutch
Replace the fan belt
Replace the radiator cap or clean the
radiator core
Repair or replace the water pump
Replace the sealing cap
Replace the thermostat
Clean the foreign material from the
cooling system
Adjust the fuel injection timing
Correction
Replace the cooling water
Replace the fuel
Adjust the fuel injection timing
Replace the related parts
Replace the valve seals, the valves,
and the valve guides