Isuzu N-Series. Service 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
6B-8 Cooling System
Thermostat
Wax pellet system
Valve opening temperature
°C (°F)
With jiggle valve 85 (185)
Without jiggle valve 82 (180)
Temperature when fully open
°C (°F)
With jiggle valve 100 (212)
Without jiggle valve 95 (203)
Cooling water total capacity
Liters (US / Imp gal.)
17.6 (4.65 / 3.87)
Cooling System 6B-9
Water Pump
Components
Legend
1. Radiator Lower Hose
2. Fan Guide
3. Fan
4. Cooling Fan Clutch
5. Setting Plate
6. Water Pump Pulley
7. Fan Belt
8. Water Pump Assembly
N6A6335E
6B-10 Cooling System
Removal
1. Drain the coolant water.
Legend
1. Radiator Drain Cock
Legend
1. Power Steering Pump
2. Drain Plug
2. Remove the radiator lower hose on the radiator
side.
3. Take out the fan guide from below.
4. Remove the four mounting nuts and then the fan
assembly. Also, loosen the four bolts for tightening
the setting plate and water pump pulley together.
Legend
1. Fan
2. Nut
3. Setting Plate
4. Water Pump Pulley
5. Bolt
5. (2) and (3) that tighten the setting plate and water
pump together. Loosen the adjusting bolts (1) in
the generator and remove the fan belt.
Legend
1. Adjusting Bolt (With A/C)
2. Lock Nut
3. Bolt
6. Remove the setting plate and water pump pulley.
N6A6336E
N6A6337E
N6A6338E
N6A6339E
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