Isuzu N-Series. Manual - part 519
Cooling System 6B-7
Coolant scooping method
• Measure the concentration using the coolant
scoop.
A List of Defective Phenomena
• Engine overheats
• Engine overcools
Engine overheats
Engine overcools
Main Data and Specifications
Main Data and Specifications
Condition
Possible Cause
Correction
Engine overheats
Cooling water volume is deficit.
Replenish.
Thermometer unit is defective.
Replace.
Thermostat is defective.
Replace.
Water pump is defective.
Replace.
Radiator is clogging.
Clean or replace.
Radiator cap is defective.
Replace.
Engine oil volume is deficient or
incorrect engine oil is used.
Replenish or change the engine oil.
Cylinder head gasket is defective.
Replace.
The fan belt is loose.
Adjust.
Exhaust system is clogging.
Clean or replace.
The fuel injection quantity is in
surplus.
Diagnose the engine control
system.
Fuel injection timing is incorrect.
Diagnose
the
engine
control
system.
Starting pressure of fuel injection is
low.
Diagnose the engine control
system.
Condition
Possible Cause
Correction
Engine overcools
Thermostat is defective.
Replace.
Cooling methods
Forced circulation system
Radiator
Tubes with corrugated fins
Radiation capacity
kW (kcal/h)
120 (103200)
Radiation area
m
2
(ft
2
)
17.78 (191.3)
Frontal area
m
2
(ft
2
)
0.367 (4.05)
Dry mass
N (lb)
196 (44.1)
Radiator cap
Valve opening pressure
kPa (kg/cm
2
/ psi)
108
± 14.7 (1.1 ± 0.15 / 15.7 ± 2.1)
Cooling water capacity
Liters (US / Imp gal.)
3.2 (0.85 / 0.70)
Water pump
Centrifugal impeller system
Pulley ratio
1.190