Isuzu 4JB1 User Manual

00 – 10 SERVICE INF
ORMATION
6.
OVERHEATING
Checkpoint Possible cause Correction
Cooling w
ater Insufficient cooling water Replenish the cooling water
F
an clutch Oil leakage from the fan clutch Replace the fan clutch
F
an belt Fan belt loose or cracked causing slippage Replace the fan belt
Radiator
Defective radiator cap or clogged radiator
core
Replace the radiator cap or clean the
radiator core
W
ater pump Defective water pump Repair or replace the water pump
Cy
linder head and
cylinder body sealing
cap
Defective sealing cap resulting in water
leakage
Replace the sealing cap
T
hermostat Defective thermostat Replace the thermostat
Cooling s
ystem Cooling system clogged by foreign material Clean the foreign material from the
cooling system
F
uel injection timing Fuel injection timing improperly adjusted Adjust the fuel injection timing
7. WHITE EXHA
UST SMOKE
Checkpoint Possible cause Correction
Cooling w
ater Insufficient cooling water Replace the cooling water
F
uel Water particles in the fuel Replace the fuel
F
uel injection timing Delayed fuel injection timing Adjust the fuel injection timing
Com
pression pressure Blown out cylinder head gasket. Worn
cylinder liner.
Piston ring sticking
Replace the related parts
Inlet and ex
haust valve
Valves seals
Defective valve seals.
Worn valves stems and valve guides
Replace the valve seals, the valves,
and the valve guides

Isuzu 4JB1 Specifications

General

Brand	Isuzu
Model	4JB1
Category	Engine
Language	English