Isuzu KB P190. Manual — part 240
6B – 16 ENGINE COOLING
P1010064
Removal
1. Disconnect battery ground cable.
2. Loosen a drain plug to drain EC.
3. Disconnect oil cooler hose on automatic transmission (A/T).
4. Disconnect radiator inlet hose and outlet hose from the
engine.
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5. Remove fan guide(1), clips(2) on both sides and the bottom
lock, then remove lower fan guide(3) with fan shroud(4).
6. Disconnect the reserve tank hose(6) from radiator.
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7. Remove bracket(5).
8. Lift up and remove the radiator assembly with hose, taking
care not to damage the radiator core with a fan blade.
ENGINE COOLING 6B – 17
Inspection and Repair
Make the necessary adjustments, repairs, and part
replacements if excessive wear or damage is discovered
during inspection.
Radiator Cap
Measure the valve opening pressure of the pressurizing valve
with a radiator filler cap tester.
Replace the cap if the valve opening pressure is outside the
standard range.
Valve opening pressure kPa (psi) 93.3
∼∼∼∼
122.7 (13.5
∼∼∼∼
17.8)
Cap tester: 5–8840–0277–0
Adapter: 5–8840–2603–0
Check the condition of the vacuum valve in the center of the
valve seat side of the cap. If considerable rust or dirt is found,
or if the valve seat cannot be moved by hand, clean or replace
the cap.
110RS006
Valve opening vacuum kPa (psi) 1.96
∼∼∼∼
4.91 (0.28
∼∼∼∼
0.71)
Radiator Core
1. A bent fin may result in reduced ventilation and overheating
may occur. All bent fins must be straightened. Pay close
attention to the base of the fin when it is being straightened.
2. Remove all dust, bugs and other foreign material.
Flushing the Radiator
Thoroughly wash the inside of the radiator and the engine
coolant passages with cold water and mild detergent. Remove
all signs of scale and rust.
Cooling System Leakage Check
Use a radiator cap tester to force air into the radiator through
the filler neck at the specified pressure of 196 kPa (28.5 psi)
with a cap tester:
• Leakage from the radiator
• Leakage from the coolant pump
• Leakage from the water hoses
6B – 18 ENGINE COOLING
110RS005
• Check the rubber hoses for swelling.
Installation
1. Install radiator assembly (9) with hose, taking care not to
damage the radiator core with a fan blade.
2. Support the radiator upper tank with the bracket (5) and
secure the radiator.
3. Connect reserve tank hose (6).
4. Install lower fan guide (3).
5. Connect radiator inlet hose and outlet hose (1) to the
engine.
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6. Connect oil cooler hose to automatic transmission.
7. Connect battery ground cable.
ENGINE COOLING 6B – 19
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8. Pour engine coolant up to filler neck of radiator, and up to
MAX mark of reserve tank.
Important operation (in case of 100% engine coolant
change) procedure for filling with engine coolant.
Engine coolant change
Refer to 6B-8 (Draining and Refilling Cooling System).
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