Isuzu N-Series. Manual — part 378
6B-6 ENGINE COOLING
WATER PUMP
Component
Removal
Preparation
• Disconnect battery ground cable.
• Drain coolant.
• Tilt the cab.
1. Radiator Lower Hose
Disconnect radiator Lower hose from radiator.
Legend
1. Radiator lower hose
4. Fan belt
2. Fan guide
5. Water pump pulley
3. Fan
6. Water pump assembly
N6A0796E
N6A0797E
ENGINE COOLING 6B-7
2. Fan Guide
3. Fan
4. Fan Belt
5. Water Pump Pulley
6. Water Pump Assembly
Inspection
Make the necessary adjustments, repairs, and part re-
placements if excessive wear or damage is discovered
during inspection.
Water Pump Assembly
1. Check the pump body for crack and damage.
2. Check the impeller for crack and corrosion.
3. Check the seal unit leakage.
4. If there is any abnormal condition, replace the wa-
ter pump as an assembly.
Bearing Unit
1. Rotate the fan center while pushing it toward the
radius, and check to see if there is any excessive
play or noise.
2. When there is any excessive play or noise found,
replace it as a water pump assembly.
Installation
1. Water Pump Assembly
1) Apply 3 — 4 mm (0.12 — 0.16 in) bead of the
recommended liquid gasket (Three Bond
1207C) or its equivalent on the water pump fit-
ting surface.
2) Install the water pump to the front retainer.
Tighten:
Water pump bolt to 24 N
⋅m (2.4 kg⋅m / 17 lb⋅ft)
• Install the water pump within 7 minutes after appli-
cation of liquid gasket.
• For the dislocation of liquid gasket, refer to the il-
lustration.
N6A0798E
N6A0799E
N6A0800E
N6A1625E
6B-8 ENGINE COOLING
Caution:
The water pump clamping bolt is also used to tighten the
front retainer. So, install the water pump before liquid
gasket gets dry immediately after installation of the front
retainer.
2. Water Pump Pulley
Tighten:
Water pump pulley bolt to 24 N
⋅m (2.4 kg⋅m / 17 lb⋅ft)
3. Fan Belt
Check the drive belt tension.
Depress the drive belt mid-portion with a 98 N
(10 kg / 22 lb) force.
Check the drive belt for cranking and other dam-
age.
Fan Belt Adjustment
Fan belt tension is adjusted by moving the generator.
Tighten:
Bolt to
• (1): 40 N
⋅m (4.1 kg⋅m / 30 lb⋅ft)
• (2): 24 N
⋅m (2.4 kg⋅m / 17 lb⋅ft)
• (3): 46 N
⋅m (4.7 kg⋅m / 34 lb⋅ft)
4. Fan
Tighten:
Fan bolt to 24 N
⋅m (2.4 kg⋅m / 17 lb⋅ft)
5. Fan Guide
6. Radiator Lower Hose
• Pour coolant into radiator.
• Connect battery ground cable.
• Start engine and check for water leakage carefully.
Legend
1. Liquid gasket
Legend
1. Set plate
2. Pulley
Drive Belt Deflection
mm (in)
New belt
8 — 12 (0.31 — 0.47)
Reuse belt
10 — 14 (0.39 — 0.55)
N6A0802E
N6A0037E
N6A0038E
ENGINE COOLING 6B-9
THERMOSTAT
Component
Removal
Preparation
• Disconnect battery ground cable
• Drain coolant
1. Radiator Upper Hose
Disconnect radiator upper hose from radiator.
2. Water Outlet Pipe
Remove mounting bolt and remove outlet pipe to-
gether with radiator upper hose.
3. Thermostat
Inspection
Make the necessary adjustments, repairs, and part re-
placements if excessive wear or damage is discovered
during inspection.
Operating Test
1. Completely submerge the thermostat in water.
2. Heat the water.
Stir the water constantly to avoid direct heat being
applied to the thermostat.
3. Check the valve initial opening temperature.
Legend
1. Radiator upper hose
3. Thermostat
2. Water outlet pipe
N6A0805E
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