Isuzu N-Series. Service manual — part 379
6B-10 ENGINE COOLING
4. Check the valve lift full opening temperature.
Installation
1. Thermostat
Install the gaskets to the thermostats and the ther-
mostats to the cylinder head as shown in the illus-
tration.
2. Water Outlet Pipe
Install the water outlet pipe with thermostat to the
cylinder head.
Tighten the water outlet pipe bolts to the specified
torque.
Tighten:
Water outlet pipe bolt to 24 N
⋅m (2.4 kg⋅m / 17 lb⋅ft)
3. Radiator Upper
• Connect battery ground cable.
• Pour coolant
• Start the engine and check coolant leakage.
Valve Initial Opening Temperature
°C (°F)
Standard
without jiggle
valve
Primary valve
80 — 84 (176 —
183)
Secondary valve
83 — 87 (181 —
189)
with jiggle valve
83.5 — 86.5
(182 — 188)
Valve Lift Full Opening Temperature
°C (°F)
Standard
without jiggle valve
95 (203)
with jiggle valve
100 (212)
Legend
1. Thermometer
2. Agitating rod
3. Wooden piece
4. Thermostat
5. Heat
N6A0806E
Legend
1. With jiggle valve
2. Without jiggle valve
N6A0807E
N6A1635E
ENGINE COOLING 6B-11
RADIATOR
Component
Removal
• Disconnect battery ground cable.
• Tilt the cab.
• Loosen drain plug to drain coolant.
Legend
1. Radiator upper hose
4. Fan guide
2. Radiator lower hose
5. Radiator
3. Coolant reserve tank hose
N6A1647E
6B-12 ENGINE COOLING
1. Radiator Upper Hose
2. Radiator Lower Hose
Disconnect upper hose and lower hose from the ra-
diator.
3. Coolant Reserve Tank Hose
4. Fan Guide
5. Radiator
1) Remove upward the radiator assembly with
hose, taking care not to damage the radiator
core by fan blade.
Inspection
Radiator Valve Check
1. Apply air pressure from filler neck using radiator
cap tester and check the opening pressure of radi-
ator valve. If the valve opening pressure is out of
the standard value range, replace with a new radi-
ator valve.
2. Remove the radiator valve and check a negative
pressure valve as the center of the valve seat side.
If the negative pressure valve does not work
smoothly, clean or replace the radiator valve.
Tighten:
Radiator valve fixing to 6 N
⋅m (0.6 kg⋅m / 4 lb⋅ft)
3. Conduct cooling system leakage check after rein-
stalling the radiator valve.
Cooling System Leakage Check
1. Clog up the reservoir tank hose carefully and check
the cooling system for leakage with a radiator cap
tester by applying an air pressure of 196 kPa (2 kg/
cm
2
/28 psi) from filler neck to inside the radiator.
2. As the radiator upper tank is provided with a valve,
the pressure fails to rise higher than the valve
opening pressure unless the hose is clogged up.
Radiator Core
1. Deformed radiator fins could reduce radiation ef-
fects, resulting in overheat. Straighten the fins. In
such a case, take care not to damage the fin roots.
2. Remove dust and other foreign materials.
Flushing the Radiator
Wash the inside of radiator and the coolant passage
with water and neutral detergent. Remove all scales and
rust.
Installation
1. Radiator
With due attention paid not to damage the radiator
core by the fan blades, install the both brackets of
the radiator to the brackets on the frame as shown
in the illustration.
Radiator Valve Opening Pressure
kPa (kg/cm
2
/psi)
93 — 123 (0.95 — 1.25/13.5 — 17.8)
N6A0810E
N6A0811E
N6A0812E
ENGINE COOLING 6B-13
2. Fan Guide
3. Coolant Reserve Tank Hose
4. Radiator Lower Hose
5. Radiator Upper Hose
• Connect battery ground cable.
• Pour coolant
• Pour coolant up to filler neck of outlet pipe, and
up to MAX mark of reserve tank.
• Start engine to warm up, and check for coolant
level.
Replenish coolant if it does not reach the outlet
pipe filler neck, and tighten the cap completely.
Legend
1. Stud bolt
2. Rubber
3. Washer
4. Flange nut
5. Flame side bracket
6. Radiator side bracket
N6A0813E
N6A0814E
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