2004 ISUZU TF SERIES engine

ENGINE MECHANICAL 6A – 139
Illustration Tool Number Tool Name
5-8840-2361-0 Front Oil Seal Installation

6A – 140 ENGINE MECHANICAL
MEMO

ENGINE COOLING 6B – 1


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 .................................................................................................................... 6B - 10
Removal and Installation .......................................................................................... 6B - 10
Removal...................................................................................................................... 6B - 10
Inspection and Repair ............................................................................................... 6B - 11
Installation.................................................................................................................. 6B - 11
Thermostat ..................................................................................................................... 6B - 13
Removal and Installation .......................................................................................... 6B - 13
Removal...................................................................................................................... 6B - 13
Inspection and Repair ............................................................................................... 6B - 13
Installation.................................................................................................................. 6B - 14
Radiator .......................................................................................................................... 6B - 15
Removal and Installation .......................................................................................... 6B - 15
Radiator and Associated Parts................................................................................. 6B - 15
Removal...................................................................................................................... 6B - 16
Inspection and Repair ............................................................................................... 6B - 17
Installation.................................................................................................................. 6B - 18

6B – 2 ENGINE COOLING

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

ENGINE COOLING 6B – 3

MAIN DATA AND SPECIFICATIONS
Description Item
M/T A/T
Cooling system
Water pump type
Pump to crankshaft speed ratio (To 1)
Delivery volume lit (US/UK gal)/min
Pump speed at 3000 rpm
Water 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

Wax 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 m
(1.081ft
)
Radiator front area
0.28m
(0.026 ft
)
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
122.7kpa (13.5
17.8psi)
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)

6B – 4 ENGINE COOLING

GENERAL DESCRIPTION
COOLANT FLOW





RTW46ALF001101

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.
When 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.

ENGINE COOLING 6B – 5

WATER PUMP



RTW46ASF000101

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.

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)





F06RW005
Antifreeze Solution
NOTE: Antifreeze solution + Water = 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.





PTW46BSH000201
NOITE:
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)
NOTE