Isuzu N-Series. Service manual — part 605
6B-6 ENGINE COOLING
• Mixing ratio
Check the specific gravity of engine coolant in the
cooling system in temperature ranges from 0
° to
50
°C using a suction type hydrometer, then deter-
mine the mixing ratio of the coolant by referring to
the table.
50
5.0
(4.40/5.28)
5.0
(4.40/5.28)
Legend
A. Mixing ratio
B. Specific gravity
C. Coolant temperature
Mixing
ratio (%)
Specified coolant
solution:
lit. (imp. qt./U.S. qt)
Water:
lit. (imp. qt/U.S. qt)
N6A3377E
ENGINE COOLING 6B-7
WATER PUMP
Component
Removal
Preparation:
• Disconnect battery ground cable.
• Drain coolant.
1. Fan Shroud
• Remove the reservoir tank hose, bypass hose and
fan guide.
2. Cooling Fan Assembly
• Remove lock nut and take out cooling fan assem-
bly.
3. Power Steering Pump Drive Belt
• Loosen the idler pulley lock nut and loosen adjust
bolt, and remove the drive belt.
4. A/C Compressor Drive Belt
• Loosen A/C compressor idler pulley lock nut and
adjust bolt and remove the drive belt.
Legend
1. Fan shroud
6. Crankshaft damper pulley
2. Cooling fan assembly
7. Timing pulley upper cover
3. Power steering pump drive belt
8. Timing pulley lower cover
4. A/C compressor drive belt
9. Water pump assembly
5. AC generator drive belt
N6A3378E
N6A3380E
6B-8 ENGINE COOLING
5. AC Generator Drive Belt
• Loosen AC Generator mounting bolt (under side)
and adjust plate lock bolt, and remove the drive
belt.
6. Crankshaft Damper Pulley
7. Timing Pulley Upper Cover
8. Timing Pulley Lower Cover
9. Water Pump Assembly
• Remove the O-ring.
Inspection
Make necessary parts replacement if extreme wear or
damage is found during inspection. Should any of the
following problems occur, the entire water pump assem-
bly must be replaced.
• Cracks in the coolant pump body
• Coolant leakage from the seal unit
• Play or abnormal noise in the bearing
• Cracks or corrosion in the impeller
Legend
1. Lock bolt
N6A3379E
N6A3699E
Legend
1. Lower cover
2. Upper cover
N6A3159E
N6A3158E
ENGINE COOLING 6B-9
Installation
1. Water Pump Assembly
• Set O-ring in water pump body groove.
• Install water pump assembly, and tighten to speci-
fied torque.
Tighten:
Pump Fixing Bolt to 20 N
⋅m (2 kg⋅m/14 lb⋅ft)
2. Timing Pulley Lower Cover
• Install timing pulley lower cover, and tighten to
specified torque.
Tighten:
Cover Fixing Bolts to 8 N
⋅m (0.8 kg⋅m/69 lb⋅in)
3. Timing Pulley Upper Cover
• Install timing upper cover, and tighten to specified
torque.
Tighten:
Cover Fixing Bolts to 8 N
⋅m (0.8 kg⋅m/69 lb⋅in)
4. Crankshaft Damper Pulley
• Install crankshaft damper pulley, and tighten to
specified torque.
Tighten:
Pulley Bolt to 19 N
⋅m (1.9 kg⋅m/14 lb⋅in)
4JG2
5. AC Generator Drive Belt
6. A/C Compressor Drive Belt
7. Power Steering Pump Drive Belt
• Install the drive belts and adjust belt.
Check drive belts for wear or damage, and replace
with new ones as necessary. Check belts for ten-
sion, and adjust as necessary.
• Push the middle of belts with a force of 98 N (10 kg/
22 lb) and check each bolt for deflection.
• Standard deflection
N6A3353E
Legend
1. A/C compressor drive belt
2. P/S oil pump drive belt
3. AC generator & cooling fan drive belt
N6A3159E
N6A3297E
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