2007 ISUZU KB P190 radiator

6A – 28 ENGINE MECHANICAL


Cooling System Inspection
Install a radiator filler cap tester to the radiator. Apply
testing pressure to the cooling system to check for
leakage. The testing pressure must not exceed the
specified pressure.

Testing Pressure kPa(kg/cm
2 /psi)
150 (1.5/21)



Radiator Cap Inspection
The radiator filler cap is designed to maintain coolant
pressure in the cooling system at 103 kPa(1.05 kg/cm2,
15psi).
Check the radiator filler cap with a radiator filler cap tester.
The radiator filler cap must be replaced if it fails to hold the
specified pressure during the test procedure.
Radiator Cap Valve Opening Pressure
kPa(kg/cm
2 /psi)
90 – 120 (0.9 – 1.2/13 – 17)

Negative Valve (Reference) kPa(kg/cm2 /psi)
1.9 – 4.9 (0.02 – 0.05/0.28 – 0.71)
030LX003
030LX002

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ISUZU KB P190 2007

ENGINE MECHANICAL 6A – 39

18. Radiator 1) Drain the engine coolant.
2) Remove the reservoir hose.
3) Remove the upper and lower hose.
4) Remove the fan guide.
5) Remove the radiator.


19. Fan

P1010034
20. Air cleaner
1) Remove the MAF sensor connector (4JA1TC/4JH1TC) from air cleaner duct.
2) Remove the air cleaner duct and the air cleaner box from engine room.
3) Remove the two air ducts from inter cooler (4JA1TC/4JH1TC).

21. Power Steering Pump Loosen the power steering pump adjust plate bolt, then
remove the power steering pump assembly. Place the
power steering pump assembly along with piping on the
body side.
22. Air conditioner compressor 1) Remove air compressor magnet connector.
2) Remove the air conditioner compressor. Place the air conditioner compressor along with piping on the body
side.
23. Engine Control Cable Remove the engine control cable from its bracket
(4JA1TC/4JH1TC) or the injection pump (4JA1T(L)).

24. Vacuum Piping Remove the vacuum pipe from the vacuum pump, the
EGR valve, injection pump FICD (4JA1T(L)).

25. Engine Harness 1) Remove following connectors from engine.
• TPS connector
• Oil pressure switch connector
• Thermo switch connector
• Injection pump connector
• Engine earth
• Thermometer unit connector
• TDC sensor
2) Remove the clips fixing engine harness.
P1010009

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ISUZU KB P190 2007

ENGINE MECHANICAL 6A – 41

















































Coolant Replenishment
Warning:
When the coolant is heated to a high temperature, be
sure not to loosen or remove the rediator cap.
Otherwise you might get scalded by hot vapor or
boiling water.
To open the radiator cap, put a piece of thick cloth on
the cap and loosen the cap slowly to reduce the
pressure when the coolant has become cooler.
1. Open rediator cap pour coolant up to filler neck
2. Pour coolant into reservoir tank up to "MAX" line
3. Tighten radiator cap and start the engine. After idling for 2 to 3 minutes, stop the engine and reopen radiator
cap. If the water level is lower, replenish.
4. After replenish the coolant tighten radiator cap, warm up the engine at about 2000 rpm. Set heater
adjustment to the highest temperature position, and let
the coolant circulate also into heater water system.
5. Check to see the thermometer, continuously idling 5 minutes and stop the engine.
6. W hen the engine has been cooled, check filler neck for water level and replenish if required. Should extreme
shortage of coolant is found, check the coolant system
and reservoir tank hose for leakage.
7. Pour coolant into the reservoir tank up to "MAX" line.
Coolant Capacity lit (US/UK gal)

4JA1 / TC 9.4 (2.5 / 2.1)
4JH1TC M/T: 10.1 (2.7 / 2.2)
A/T: 10.0 (2.6 / 2.2)
























Engine Warm-Up
After completing the required maintenance procedures,
start the engine and allow it to idle until it is warm.
Check the following:
1. Engine idling speed.
2. Engine noise level.
3. Engine lubricating system and cooling system. Carefully check for oil and coolant leakage.
4. Clutch engagement.
5. Transmission operation.
6. Indicator warning light operation.



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ISUZU KB P190 2007

ENGINE MECHANICAL 6A – 135


INTER COOLER
REMOVAL AND INSTALLATION





RTW 46ALF001001

Removal Steps
1. Radiator grille
2. Front bumper fascia
3. Front bumper inpact support assembly
4. Inter cooler

Installation Steps
4.
Inter cooler
3. Front bumper inpact support assembly
2. Front bumper fascia
1. Radiator grille



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ISUZU KB P190 2007

6A – 136 ENGINE MECHANICAL





RTW 36ASH000601
Removal
1. Radiator Grille
• Refer to removal procedure in Sheet Metal section.







RTW 36ASH000501
2. Front Bumper Fascia

• Remove the nine clips and four screws.
• Disconnect the fog light harness connectors.
















RTW 46ASH002101
3. Front Bumper Impact Support Assembly
• Remove the nut and two bolts.


4. Inter Cooler
• Remove the nut and two bolts.
• Disconnect the air hose.




Installation
4. Inter Cooler • Tighten the nut and two bolts.


3. Front Bumper Impact Support Assembly
• Tighten the nut and two bolts.



2. Front Bumper Fascia
• Install the nine clips and four screws.
• Connect the fog light harness connectors.


1. Radiator grille
• Refer to installation procedure in Sheet Metal section.



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ISUZU KB P190 2007

SECTION 6B
ENGINE COOLING


TABLE OF CONTENTS
PAGE
Main Data and Specifications ....................................................................................... 6B - 3
General Description .................................................................................................. 6B - 4
Coolant Flow .............................................................................................................. 6B - 4
Water Pump ............................................................................................................... 6B - 5
Thermostat................................................................................................................. 6B - 5
Radiator...................................................................................................................... 6B - 6
Diagnosis ...................................................................................................................... . 6B - 7
Draining and Refilling Cooling System ....................................................................... 6B - 8
Water Pump ................................................................................................................... 6 B - 10
Removal and Installation .......................................................................................... 6B - 10
Removal ..................................................................................................................... 6 B - 10
Inspection and Repair ............................................................................................... 6B - 11
Installation ................................................................................................................. 6B - 11
Thermostat ..................................................................................................................... 6B - 13
Removal and Installation .......................................................................................... 6B - 13
Removal ..................................................................................................................... 6 B - 13
Inspection and Repair ............................................................................................... 6B - 13
Installation ................................................................................................................. 6B - 14
Radiator ....................................................................................................................... ... 6B - 15
Removal and Installation .......................................................................................... 6B - 15
Radiator and Associated Parts ................................................................................ 6B - 15
Removal ..................................................................................................................... 6 B - 16
Inspection and Repair ............................................................................................... 6B - 17
Installation ................................................................................................................. 6B - 18
EN GI NE COOLI NG 6 B – 1

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ISUZU KB P190 2007

ENGINE COOLING 6B – 3

MAIN DATA AND SPECIFICATIONS
Description Item M/T A/T
Cooling system
W ater pump type
Pump to crankshaft speed ratio (To 1)
Delivery volume lit (US/UK gal)/min
Pump speed at 3000 rpm
W ater temperature at 30 °C (86 °F)
Pump bearing type

Thermostat type
Valve initial opening temperature °C ( °F)
(Oil cooler thermo valve)
(EGR cooler thermo valve)
Valve full opening temperature °C ( °F)
(Oil cooler thermo valve)
(EGR cooler thermo valve)
Valve lift at fully open position mm (in)
(Oil cooler thermo valve)
(EGR cooler thermo valve) Engine coolant forced circulation
Centrifugal impeller type 1.2
100 (26.3/22.2)

Double row shaft
W ax pellet with jiggle valve 82 (180)
76.5 (170) 40 (104)
95 (203)
90 (194)
55 (131)
9.5 (0.37)
4.5 (0.18)
3.5 (0.14)
Radiator Tube type corrugated
Heat radiation capacity 93.0 kW (79,980 kcal/h)
Heat radiation area 11.63 m2 (1.081ft2)
Radiator front area 0.28m2 (0.026 ft2)
Radiator dry weight 52 N (5.3 kg/11.7 lb) 53 N (5.4 kg/11.9 lb)
Radiator cap valve opening pressure 93.3 ~ 122.7 kPa (13.5 ~ 17.8 psi)
Engine coolant capacity 2.4 lit (5.1 U.S pint) 2.3 lit (4.9 U.S pint)
Engine coolant total capacity 10.1 lit (21.3 U.S pint) 10.0 lit (21.1 U.S pint)




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6B – 4 ENGINE COOLING

GENERAL DESCRIPTION
COOLANT FLOW








RTW 66ALF000101

The engine cooling system consists of the radiator, the water pump, the cooling fan, and the thermostat.
To quickly increase cold engine coolant temperature for smooth engine operation, the coolant is circulated by the
water pump and thermostat through the bypass hose and back to the cylinder body.
The coolant does not circulate through the radiator.
W hen the coolant temperature reaches specified value, the thermostat will begin to open and a gradually increasing
amount of coolant will circulate through the radiator.
The thermostat will be fully open when the coolant temperature reaches specified value. All of the coolant is now
circulating through the radiator for effective engine cooling.


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ISUZU KB P190 2007