Isuzu N-Series. Service manual - part 522
Cooling System 6B-19
Radiator core
1. If the radiator fin is deformed, the radiation effect
deteriorates causing overheating. Therefore,
modify the fin. Make sure that the root base of the
fin is not damaged during modification.
• Eliminate dust or other foreign matter.
Washing the radiator
1. Wash the internal parts of the radiator and cooling
water passage using water and detergent.
Eliminate scale and rust completely.
Installation
1. Ensure that no damage occurs to the radiator core
because of the fan blade. Mount the brackets on
the left and right sides of the radiator on the frame
according to the figure.
Tighten:
Bolts to 55 N
⋅m (5.6 kg⋅m / 41 lb⋅ft)
Legend
1. Flange Nut
2. Rubber
3. Stud Bolt
4. Frame
5. Bracket on The Radiator Side
6. Washer
2. Mount the reserve tank hose of the coolant on the
radiator.
3. Mount the radiator lower hose.
4. Mount the radiator upper hose.
• Fill the cooling water.
5. Install the 2 transmission oil pipes on the
underside of the radiator.
6. Install the intake pipe from the turbocharger and
inter-cooler (left side).
7. Install the intake pipe from the intake manifold and
inter-cooler (right side).
Reference
Cooling water injection procedure (in case of changing
the cooling water completely)
• Confirm that the engine has cooled.
• Open the radiator cap and the reserve tank cap.
• Pour the cooling water up to the filler neck.
• Pour the cooling water up to the “MAX” line in the
reserve tank.
• Close the radiator cap and the reserve tank cap
and start the engine. Stop the engine after running
for about 2 to 3 minutes at the idling rpm. Open the
radiator cap again and replenish if the water level
is low.
WARNING:
DO NOT LOOSEN OR REMOVE THE RADIATOR
CAP WHEN THE TEMPERATURE OF THE COOLING
WATER IS HIGH. STEAM OR BOILING WATER WILL
GUSH OUT AND YOU MAY BE BURNT. TO OPEN
THE RADIATOR CAP, COVER THE CAP WITH A
THICK CLOTH WHEN THE COOLING WATER IS
COOL, RELEASE THE PRESSURE BY SLOWLY
TURNING THE CAP, AND THEN REMOVE THE CAP.
• After tightening the radiator cap, warm up the
engine by running it at about 2000 rpm. Also,
adjust the temperature of the heater to maximum
temperature and circulate the cooling water even
in the heater water conduit system.
• When the pointer of the thermometer crosses the
median and the thermostat has activated, run at
idling rpm for another 5 minutes, then stop the
engine and leave it as-is.
• After the engine has cooled down sufficiently,
check the water level in the filler neck part and
replenish if necessary. If the level is extremely low,
check for leaks in the cooling water conduit system
and reserve tank hose.
N6A6247E