2007 ISUZU KB P190 cooling

6A – 120 ENGINE MECHANICAL









4. Water Inlet Pipe
1) Tighten the water inlet pipe bolts to the specified torque.
Suction Pipe Bolt Torque N·m(kg·m/Ib ft)
19 (1.9/14)





5. Generator and Adjusting Plate
1) Install the generator to the bracket (1).
2) Temporarily tighten the generator bolt (2) and adjusting plate bolts (3).
The bolts will be finally tightened after installation of
the cooling fan drive belt.



3) Connect the vacuum pump rubber hose (4) to the
vacuum pump (5), and the oil pan (6).
6. Vacuum Pump Oil Return Hose Connect the vacuum oil pipe (7) to the vacuum pump, and
the cylinder body

052R300001
7. Compressor Bracket 1) Install the compressor bracket to the cylinder head.
2) Tighten the bracket bolts to the specified torque.
Bracket Bolt Torque N·m(kg·m/Ib ft)
M8×1.25
19 (1.9/14)
M10×1.25
40 (4.1/30)











066RY00002
032R300001
042RY00003

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6A – 122 ENGINE MECHANICAL

















RTW 46ASH001601































9) Install the water feed adapter (1) with the gaskets to
turbocharger and tighten to the specified torque.
Adapter Torque N·m(kg·m/Ib ft)
39 (4.0/29)

10) Install the water feed pipe with the gaskets and tighten to the specified torque.
W ater Return Pipe Torque N·m(kg·m/Ib ft)
39 (4.0/29)

11) Install the water return pipe with the gaskets and tighten to the specified torque.
W ater Return Torque N·m(kg·m/Ib ft)
39 (4.0/29)

12) Clamp the water feed pipe to the oil return pipe of the turbocharger.
Fixing Bolt (3) Torque N·m(kg·m/Ib ft)
8 (0.8/6)

13) Install the hoses for the water feed and return.






















9. Catalytic Converter
Install the catalytic converter with gasket and tighten the
nut to the specified torque.
Catalytic converter Nut Torque N·m(kg·m/Ib ft)
27 (2.7/20)

Do not install the catalytic converter, if drop down it.
10. Heat Protector Install the heat protector and tighten the bolt to the
specified torque.
Heat Protector Bolt Torque N·m(kg·m/Ib ft)
9 (0.9/6.5 Ib in)

033R300002











11. Cooling Fan Pulley
1) Install the cooling fan pulley to the water pump.
2) Tighten the cooling fan pulley nuts to the specified torque.
Pulley Nut Torque N·m(kg·m/Ib ft)
8 (0.8/6)

12. Oil Cooler Water Pipe
13. Fuel Leak Off Pipe
14. Oil Pressure Warning Switch
027R100007

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6A – 126 ENGINE MECHANICAL


LUBRICATION SYSTEM
LUBRICATING OIL FLOW









1. Oil Pump Relief Valve Operating Pressure: 6.2 - 7.8 kg/cm
2 (608 – 764 kPa)
2. Regulating Valve Operating Pressure: 5.7 - 6.3 kg/cm2 (558.6 - 617.4 kPa)
3. Oil Cooler Relief Valve Opening Pressure: 2.8 - 3.4 kg/cm2 (270 – 330 kPa)
4. Oil Filter Relief Valve Opening Pressure: 0.8 - 1.2 kg/cm2 (78.4 - 117.6 kPa)
5. Oil Pressure Switch Operating Pressure: 0.3 - 0.5 kg/cm2 (29.4 - 49.0 kPa)
6. Regulating Valve: 1.8 - 2.2 kg/cm2 (176 – 216 kPa)

The 4J series engine has a full flow type lubricating system.
Lubricating oil is pumped from the oil pump to the cylinder body oil gallery through the oil cooler and the oil filter. It is
then delivered to the vital parts of the engine from the cylinder body oil gallery.
Oiling jets installed on the cylinder body spray engine oil to the piston backside faces to achieve maximum piston
cooling effect.

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ENGINE MECHANICAL 6A – 127

OIL PUMP AND OIL FILTER




RTW 46ALF001501

The 4J series engine is equipped with a gear type oil pump.
The oil filter and the water cooled oil cooler integrated a single unit to increase the cooling effect.



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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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6B – 2 ENGINE COOLING

PAGE
Engine coolant change ............................................................................................. 6B - 19
Fan Clutch with Cooling Fan ........................................................................................ 6B - 20
Inspection and Repair ............................................................................................... 6B - 20
Special Tools ............................................................................................................. 6B - 20

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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