Isuzu N-Series. Service manual — part 606
6B-10 ENGINE COOLING
4JB1
Tighten:
• Generator Fixing Belt to 40 N
⋅m (4.1 kg⋅m/30 lb⋅ft)
• Adjust Plate Fixing Belt to 19 N
⋅m (1.9 kg⋅m/14 lb⋅ft)
• A/C Idler Pulley Lock Nut to 27 N
⋅m (2.8 kg⋅m/20 lb⋅ft)
• P/S Idler Pulley Lock Nut to 27 N
⋅m (2.8 kg⋅m/20 lb⋅ft)
8. Cooling Fan Assembly
• Mount fan pulley and cooling fan assembly on the
water pump and tighten to the specified torque.
Tighten:
Fan Pulley Nut to 8 N
⋅m (0.8 kg⋅m/69 lb⋅in)
9. Fan Shroud
• Install the fan shroud and reservoir tank hose and
bypass hose.
• Connect the battery ground cable.
• Pour coolant.
• Start the engine and check coolant leakage.
mm (in)
Initial tension
AC Generator drive belt
A/C compressor drive belt
Power Steering pump drive belt
8 — 12
(0.31 — 0.47)
Legend
1. A/C compressor drive belt & P/S pump drive
belt
2. AC generator & fan pulley drive belt
N6A3295E
N6A3379E
ENGINE COOLING 6B-11
THERMOSTAT
Component
Removal
Preparation:
• Disconnect battery ground cable.
• Drain coolant from the radiator and engine.
1. Switch Harness
2. Outlet Pipe
• Remove mounting bolt and remove outlet pipe to-
gether with radiator hose.
3. Gasket
4. Thermostat
Inspection
Submerge the thermostat assembly in the water.
Place wooden blocks on the bottom of the water con-
tainer.
Not to directly heat the thermostat.
Gradually increase the water temperature. Stir the water
so that the entire water is same temperature.
• Make sure that primary valve begins to open at the
specified temperature.
• Make sure that secondary valve opens fully at the
specified temperature.
Legend
1. Switch harness
3. Gasket
2. Outlet pipe
4. Thermostat
N6A3385E
Valve Opening Temperature
°C(°F)
82 (180)
Valve Full Open Temperature
°C(°F)
95 (203)
6B-12 ENGINE COOLING
Make necessary repair and parts replacement if ex-
treme wear or damage is found during inspection.
Installation
1. Thermostat
2. Gasket
3. Outlet Pipe
• Connect outlet pipe and tighten bolts to the speci-
fied torque.
Tighten:
19 N
⋅m (1.9 kg⋅m/14 lb⋅ft)
4. Switch Harness
• Install switch harness.
• Install battery ground cable.
• Pour coolant.
• Start the engine and check coolant leakage.
N6A3386E
N6A3387E
ENGINE COOLING 6B-13
RADIATOR
Component
Removal
Preparation:
• Disconnect battery ground cable.
• Loosen drain plug to drain coolant.
1. Reservoir Tank Hose & Bypass Hose
• Disconnect the hose from radiator.
2. Radiator Hose
• Disconnect lower hose and upper hose from the
engine.
3. Air Intake Duct
4. Radiator Stay
5. Condenser
• Remove the condenser from radiator and tempo-
rarily tighten the condenser to cab body front side,
use the wire.
6. Cushion Rubber
• Remove cushion rubbers on both sides of the bot-
tom.
7. Radiator Assembly
• Remove upward the radiator assembly with hose,
taking care not to damage the radiator core by fan
blade.
Inspection
Radiator Valve
• 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.
Legend
1. Reservoir tank hose & Bypass hose
5. Condenser
2. Radiator hose
6. Cushion rubber
3. Air intake duct
7. Radiator assembly
4. Radiator stay
N6A3388E
Radiator valve opening pressure
kPa (kg/cm
2
/psi)
93 — 123 (0.95 — 1.25/13.5 — 17.8)
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