2007 ISUZU KB P190 engine

ENGINE MECHANICAL 6A – 139
Illustration Tool Number Tool Name
5-8840-2361-0
Front Oil Seal Installer
5-8840-0145-0 Static Timing Gauge

5-8840-2834-0
Adapter Set: Static Timing Gauge


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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

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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ISUZU KB P190 2007

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

ENGINE COOLING 6B – 5

WATER PUMP


RTW 46ASF000101

A centrifugal type water pump forcefully circulates the coolant through the cooling system.
The water pump is not disassembled type.

THERMOSTAT














030RY00005
A wax pellet type thermostat is used.
The jiggle valve accelerates engine warm-up.


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ISUZU KB P190 2007

6B – 6 ENGINE COOLING



110RS001
RADIATOR
The radiator is a tube type with corrugated fins. In order to
raise the boiling point of the coolant, the radiator is fitted with a
cap in which the valve is operated at 93.3
∼ 122.7 kPa (13.5 ∼
17.8 psi) pressure. (No oil cooler provided for M/T)





F06RW 005
Antifreeze Solution
NOTE: Antifreeze solution + W ater = Total cooling system
capacity.
Total Cooling System Capacity Lit (US / UK gal)
9.4 (2.5/21) 4JA1L/TC
M/T 10.1 (2.7/2.2) 4JH1TC
A/T 10.0 (2.6/2.2) 4JH1TC
See section 0B MAINTENACE AND LUBRICATION .





PTW 46BSH000201
NOTE:
To maintain the corrosion resistance of the aluminum
radiator, water and antifreeze must be combined in a 1:1
solution (50% antifreeze and 50% water)




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ISUZU KB P190 2007

ENGINE COOLING 6B – 7
DIAGNOSIS
Engine Cooling Trouble
Symptom Possible Cause Action
Low Engine Coolant level Replenish
Thermo meter unit faulty Replace
Faulty thermostat Replace
Faulty Engine Coolant temperature
sensor Repair or replace
Clogged radiator
Clean or replace
Faulty radiator cap Replace
Low engine oil level or use of
improper engine oil Replenish or change oil
Clogged exhaust system
Clean exhaust system or replace
faulty parts
Faulty Throttle Position sensor Replace throttle valve assembly
Open or shorted Throttle Position
sensor circuit Repair or replace
Engine overheating
Damaged cylinder head gasket Replace
Engine overcooling Faulty thermostat Replace
Faulty thermostat Replace Engine slow to warm–up
Thermo unit faulty Replace



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ISUZU KB P190 2007