2004 ISUZU TF SERIES coolant

6A – 34 ENGINE MECHANICAL



RTW46ASH000701
9. Turn the crankshaft clockwise and read the gauge
indication when the crankshaft pulley timing mark (8)
is aligned with the pointer.

Injection Timing : BTDC 8  2

Standard Reading mm (in)
0.5 (0.02)

If the injection timing is outside the specified range,
continue with the following steps.


10. Loosen the injection pump fixing nuts and bracket
bolts.
11. Adjust the injection pump setting angle.
When large than standard
value When smaller than standard
value
R A


A: Move the injection pump toward the engine.
R: Move the injection pump away from the engine.

ENGINE CONTROL (4JA1T(L) only)
Idling Speed Adjustment
1. Set the vehicle parking brake and chock the drive
wheels.
2. Place the transmission in neutral.
3. Start the engine and allow it to idle until the coolant
temperature reaches 70 - 80C (158 - 176F).


4. Disconnect the engine control cable from the control
lever.
5. Set a tachometer to the engine.
6. Check the engine idling speed.
If the engine idling speed is outside the specified
range, it must be adjusted.
Engine Idling Speed : 730  25 rpm


Idling Speed Adjustment
1. Loosen the idling set screw lock nut
on the injection
pump idling set bolt.
2. Adjust the idling speed to the specified range by
turning the idling set bolt
.
3. Lock the engine set nut

with the idling set bolt lock
nut.
4. Check that the idling control cable is tight (free of
slack). If required, remove the slack from the cable.

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

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. When 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)

9.5 (2.5/2.1)
























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.

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.