Isuzu N-Series. Service manual — part 521
Cooling System 6B-15
Installation
1. Mount the gasket on the thermostat and mount it at
the position shown in the figure.
• Mount the thermostat at the position shown in
the figure, as there are two types of thermostats
with different shapes.
• Fit the thermostat gasket ensuring that it does
not come out of and on top of the external
housing on the cylinder head side.
Legend
1. Thermostat
2. Cylinder Head
2. Mount the water outlet pipe.
Tighten:
Bolt to 24 N
⋅m (2.4 kg⋅m / 17 lb⋅ft)
3. Mount the radiator upper hose.
4. Replenish the cooling water stored during the
discharge, and check the volume of the cooling
water.
Legend
1. Reserve Tank
2. MAX Line (Upper Limit)
3. MIN Line (Lower Limit)
N6A6348E
N6A6349E
N6A6330E
6B-16 Cooling System
Torque Specifications
N6A6356E
Cooling System 6B-17
Radiator and Intercooler
Components
Legend
1. Coolant Reserve Tank Hose
2. Radiator Upper Hose
3. Radiator and Intercooler
4. Fan Guide
5. Radiator Lower Hose
Removal
1. Loosen the water drain plug (to the right of the
engine toward the rear) and radiator drain plug,
and discharge the cooling water completely.
N6A6350E
6B-18 Cooling System
• After discharging the water, tighten the drain
cock.
Legend
1. Radiator Drain Cock
Legend
1. Power Steering Pump
2. Drain Plug
2. Remove the intake pipe from the intake manifold
and inter-cooler (right side).
3. Remove the intake pipe from the turbo charger and
inter-cooler (left side).
4. Remove the 2 transmission oil pipes on the
underside of the radiator.
5. Remove the upper hose on the radiator side.
6. Remove the lower hose on the radiator side.
7. Remove the coolant reserve tank hose from the
radiator side.
8. Take care to avoid damage to the radiator core
from the fan blade, and remove the brackets on
the right and left sides of the radiator.
Simultaneously remove the radiator and inter-
cooler.
Inspection
Radiator cap
1. Check the valve opening pressure using the
radiator cap tester. If the valve opening pressure
deviates from the standard value, replace the
radiator cap.
Valve opening pressure =
108
± 14.7 kPa (1.1 ± 0.15 kg/cm
2
/ 15.7
± 2.1 psi)
2. Check the state of the negative pressure valve
situated at the center on the valve seat side of the
cap. If the valve seat does not function smoothly
due to rust or dirt, clean or replace the radiator
cap.
N6A6336E
N6A6337E
N6A6351E
N6A6352E
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