coolant capacity ISUZU TROOPER 1998 Service Repair Manual

6B±4
ENGINE COOLING
NOTE: An t if r e e ze s o lu t io n + Water = Total cooling
system capacity.

Total Cooling System Capacity

M/T 8.8Lit (2.32Us gal)

A/T 8.4Lit (2.22Us gal)
B06RW002

Mixing ratio
Check the specific gravity of engine coolant in the
cooling system temperature ranges from 0
C to 50
C
using a suction type hydrometer, then determine the
density of the engine coolant by referring to the table.
NOTE:
1. Even in the areas where the atmospheric
temperature is higher than 0
C, be sure not to use
antifreeze solution at a mixing ratio lower than 20% so
that the inside of the engine may not be corroded.
2. If antifreeze solution is used at a mixing ratio higher
than 60%, the specific heat of the coolant falls and the
engine may be overheated. Moreover, antifreeze
performance drop and the coolant may be frozen.
The density of the solution must be adjusted as
occasion calls.
Antifreeze solution lower than 20% may not have
sufficient anticorrosive performance, and therefore,
please never fail to adjust as occasion demands within
the range of 20% to 60%.
B06RW003

ENGINE COOLING6B±13
Main Data and Specifications
General Specifications
M/TA/T
Cooling systemEngine coolant forced circulation
Radiator(1 tube in row) Tube type corrugated (2 tube in row)
Heat radiation capacity68,000 kcal/h77,000 kcal/h
Heat radiation area9.445m
(0.878ft
)11.21m
(1.04ft
)
Radiator front area0.302m
(0.028ft
)
Radiator dry weight39N (8.8lb)44N (9.9lb)
Radiator cap valve opening pressure93.3 ~ 122.7kpa (13.5 ~ 17.8psi)
Engine coolant capacity2.5lit (2.6U.S q.t.)2.4lit (2.5U.S q.t.)
Engine coolant pumpCentrifugal impeller type
Delivery300 (317) or more
Pump speed5000 + 50 rpm
ThermostatWax pellet type with air hole
Valve opening temperature74.5 ~ 78.5
C (166.1 ~ 173.3
F)
Engine coolant total capacity10.4lit (11.0U.S qt)10.5lit (11.1U.S qt)
Torque Specifications
N´m (Kg´m/lb ft)

E06RW041

00 Ð 20 SERVICE INFORMATION
MAIN DATA AND SPECIFICATIONS
GENERAL SPECIFICATIONS
Engine type
Camshaft type
Cylinder line-type
Number of cylinders
Bore x stroke
Total piston displacement
Compression ratio
Engine weight (dry)
Engine idling speed (Reference)
Compression pressure
Firing order
Injection timing
VALVE SYSTEM
Intake valves
Exhaust valve
Valve clearance at
Oil filter
Oil capacity (Original factory fill or rebuilt engine)
Oil capacity (Service change)
with filter change
without filter change
Oil cooler
Inter cooler
Turbocharger
Control method
Lubrication method
Cooling method
(mm)
(cc)
(to 1)
N (kg/lb)
RPM
open at:
close at:
open at:
close at:
cold
intake:
exhaust:mm (in)Diesel, four cycle water cooled inline
Overhead valve
Dry type
4
95.4 x 107
3,059
20.0
2353 (240/529)(4JG2-NA)
2597 (265/584)(4JG2-T)
750 (4JG2-NA)
720 (4JG2-T)
2940 (30/426)-200
1–3–4–2
1¡A.T.D.C (4JG2-NA)
T.D.C. (4JG2-T)
B.T.D.C. 24¡
A.B.D.C. 55¡
B.B.D.C. 54¡
A.T.D.C. 26¡
0.40 (0.016)
0.40 (0.016)
Full flow and bypass combined type
7.1 liters (6.3 US quarts)
6.0 liters (6.3 US quarts)
5.0 liters (5.3 US quarts)
Water cooled type
Air cooled type
Wastegate control
Pressurized control
Coolant cooled kpa (kg/cm /psi)-rpm
2

SERVICE INFORMATION 00 Ð 21
Engine Cooling
Starting System
Cooling system
Radiator
Heat radiation capacity
Heat radiation area
Front area
Dry weight
Radiator cap
Valve opening pressure
Coolant capacityCoolant forced circulation
(2 tube in row) Tube type corrugated
318 x 10 (76000)
15.63 (1.454)
0.309 (2.029)
83 (8.5/18.7 )
88.2~117.6 (0.899~1.199/12.78~17.05)
2.8 (2.46/2.96) J/h (kcal/h)
m
2 (ft2 )
m
2 (ft2 )
N(Kg/lb)
kPa(Kg/cm
2psi)
lit (Imp.qt./US qt.)
Coolant pump
Pulley ratioCentrifugal impeller type
1.2
Coolant total capacity
lit (Imp.qt./US qt.)8.6 (7.57/9.09)
6
Rating
Voltage
Output
Time
Number of tooth of pinion
Rotating direction (as viewed from pinion)
Weight (approx.)
No-load characteristics
Voltage/current
Speed
Load characteristics
Voltage/current
Torque
Speed
Locking characteristics
Voltage/current
Torque
Model HITACHI S14-03
V
kw
sec12
30
9
Clockwise
N (kg/lb)
59 (6.0/13.2)
V/A
rpm11/160 or less
3900 or more
V/A
N•m (kg•m/lb•ft)
rpm10.85/300
7.4 (0.75/5.4) or more
2000 or more
V/A
N•m (kg•m/lb•ft)3/1300 or less
26 (2.7/20) or more
11.5/120 or less
4000 or more
7.5/500
13 (1.3/9) or less
1400 or more
2/850 or less
16 (1.6/12) or more2.2 2.8DENSO ADR4G1

00 Ð 30 SERVICE INFORMATION
Fuel Filter Water Draining Procedure
The indicator light will come on when the water level in the
water separator exceeds the specified level.
Drain the water and foreign material from the water separa-
tor with the following procedure.
1. Find a safe place to park the vehicle.
2. Open the engine hood and place a container (Approxi-
mately 0.2 liter capacity) at the end of the vinyl hose
beneath the drain plug on the separator.
3. Loosen the drain plug by turning it counterclockwise
(Approximately 5 turns) and operate the priming pump
up and down about 10 times until water is drained
approximately 0.1 liter.
4. After draining, securely tighten the drain plug by turn-
ing it clockwise and operate the priming pump manu-
ally up and down several times.
5. After starting the engine, check to see that there is no
fuel leak from the drain plug.
Also check to see that the fuel filter water indicator light
has turned off.
If water separator requires frequent draining, have the
fuel tank drained for removal of water at your Isuzu
Dealer.
Air Bleeding
1. Loosen the bleeder screw on the injection pump over-
flow valve.
2. Operate the priming pump until fuel mixed with foam
flows from the bleeder screw.
3. Tighten the bleeder screw.
4. Operate the priming pump several times and check for
fuel leakage.
COOLING SYSTEM
Coolant Level
Check the coolant level and replenish the radiator reserve
tank as necessary.
If the coolant level falls below the ÒMINÓ line, carefully check
the cooling system for leakage. Then add enough coolant to
bring the level up to the ÒMAXÓ line.
NOTE:
Do not overfill the reserve tank.

6B Ð 4 ENGINE COOLING
ANTI-FREEZE SOLUTION
·Relation between Mixing ratio and Freezing point
Freezing temperature of the engine coolant varies
with the ratio of anti-freeze solution in water.
Proper mixing ratio can be determined by refering to
the chart. Supplemental inhibitors or additives
claiming to increase cooling capability that have not
been specifically approved by Isuzu are not
recommended for addition to the cooling system.
·Calculation of mixing ratio
Mixing ratio
Note: Anti-freeze solution + Water = 8.6 lit
Total cooling system capacity.
=Anti-freeze solution (Lit/qt.)
Anti-freeze solution (Lit/
qt.) + Water (Lit/qt.)
In case of 6.8 lit total cooling system capacity
Mixing
ratio (%)Anti-freeze
solution:
lit. (imp. qt./U.S. qt)Water:
lit. (imp.qt/U.S. qt)
0
5
10
15
20
25
30
35
40
45
500
0.3
0.7
1.0
1.4
1.7
2.0
2.4
2.7
3.1
3.40
(0.26/0.32)
(0.62/0.74)
(0.88/0.93)
(1.23/1.48 )
(1.50/1.80)
(1.76/1.86)
(2.11/2.23)
(2.38/2.85)
(2.72/2.87)
(2.99/3.60)6.8
6.5
6.0
5.8
5.4
5.1
4.8
4.4
4.1
3.7
3.4
(5.98/7.19)
(5.71/6.87)
(5.28/6.34)
( 5.1/6.13)
( 4.75/5.7)
(4.49/5.39)
(4.22/5.04)
(3.87/4.65)
( 3.6/4.33)
(3.26/3.91)
(2.99/3.59)
·Mixing ratio
Check the specific gravity of engine coolant in the
cooling system in temperature ranges from 0¡ C to
50¡ C using a suction type hydrometer, then
determine the density of the coolant by refering to the
table at left.

ENGINE MECHANICAL 6A – 3
SERVICE INFORMATION
MAIN DATA AND SPECIFICATION
Engine type Diesel, four cycle water cooled inline
Camshaft type DOHC
Number of cylinders 4
Bore x stroke (mm) 95.4 x 104.9
Total piston displacement (cc) 2999
Compression ratio (to 1) 19.0
For Europe : 18.5
Engine weight (dry) N (kg/lb) 2492 (254/560) (A/T)
For Europe : 2422 (247/545) (A/T)
2649 (270/593) (M/T)
For Europe : 2697 (275/606) (M/T)
Engine idling speed (Reference) RPM 720
Compression pressure kpa (kg/cm
2/psi)-rpm 3040 (31/441)-200
Firing order 1–3–4–2
VALVE SYSTEM
Intake valves open at: B.T.D.C. 3°
close at: A.B.D.C. 57.6°
Exhaust valves open at: B.B.D.C. 56.5°
close at: A.T.D.C. 5°
Valve clearance (at cold) mm (in)
intake: 0.15 (0.006)
exhaust: 0.25 (0.01)
Oil filter Full flow and bypass combined type
Oil capacity (Original factory fill or rebuilt engine) 9.0 liters (7.9 US quarts)
Oil capacity (Service change)
with filter change 6.0 liters (6.3 US quarts)
without filter change 5.0 liters (5.3 US quarts)
Oil cooler Water cooled type
Inter cooler Air cooled type
Turbocharger method
Control method Wastegate control
Lubrication Pressurized control
Cooling method Coolant cooled
Crankshaft
As tufftriding (Nitrizing treatment) is applied to increase
crankshaft strength, crankpins and journals should not
be reground.
Piston Cooling
An oiling jet device for piston cooling is provided in the
lubricating oil circuit from the cylinder block oil gallery
via a check valve.
Take care not to damage any oiling jet when removing
and installing piston and connecting assembly.
Fuel Injection System
The injection system is oil rail type.
Quick On Start 4 System
QOS4 preheating system which features a quick-on
glow plug with thermometer control of the glowing time
and the afterglow time function, is applied.

6A – 4 ENGINE MECHANICAL
Engine Cooling
Starting System
Cooling system Coolant forced circulation
Radiator (2 tube in row) Tube type corrugated
Heat radiation capacity J/h (kcal/h) 318 x 10
6(76000)
Heat radiation area m
2(ft2) 15.63 (1.454)
Front area m
2(ft2) 0.309 (2.029)
Dry weight N (kg/lb) 83 (8.5/18.7)
Radiator cap
Valve opening pressure kPa (kg/cm
2/ psi) 93.3 – 122.7 (0.95 – 1.25/13.5 – 17.8)
Coolant capacity lit (Imp.qt./US qt.) M/T 2.5 (2.2/2.6) A/T 2.4 (2.1/2.5)
Coolant pump Centrifugal impeller type
Pulley ratio (to 1) 1.2
Coolant total capacity lit (Imp.qt./US qt.) 9.3 (8.2/9.8)
Model HITACHI S14-0
Rating
Voltage V 12
Output kW 2.8
Time sec 30
Number of teeth of pinion 9
Rotating direction (as viewed from pinion) Clockwise
Weight (approx.) N(kg/lb) 49 (5.0/11)
No-load characteristics
Voltage/current V/A 11/160 or less
Speed rpm 4000 or more
Load characteristics
Voltage/current V/A 8.76/300
Torque N·m(kg·m/lb·ft) 7.4 (0.75/5.4) or more
Speed rpm 1700 or more
Locking characteristics
Voltage/current V/A 2.5/1100 or less
Torque N·m(kg·m/lb·ft) 18.6 (1.9/14) or more

6B – 4 ENGINE COOLING
ANTI-FREEZE SOLUTION
•Relation between Mixing ratio and Freezing point
Freezing temperature of the engine coolant varies
with the ratio of anti-freeze solution in water.
Proper mixing ratio can be determined by refering
to the chart. Supplemental inhibitors or additives
claiming to increase cooling capability that have not
been specifically approved by Isuzu are not
recommended for addition to the cooling system.
•Calculation of mixing ratio
Mixing ratio (%)
=Anti-freeze solution (Lit/qt.)
×100
Anti-freeze solution (Lit/qt.) + Water (Lit/qt.)
For example
In case total coolant capacity = 10
l
It is necessary to mix about 35% anti-freeze
solution at ambient temperature minus 20°C.
Capacity of anti-freeze solution:
35
×10 = 3.5
l100
Water capacity: 10
l– 3.5 l= 6.5 l
Therefore, you prepare the water 6.5 land anti-
freeze solution 3.5
l, then mix them to get total
10
lcoolant.•Mixing ratio
Check the specific gravity of engine coolant in the
cooling system in temperature ranges from 0°C to
50°C using a suction type hydrometer, then
determine the density of the coolant by referring to
the table at below.
-1010 0
Freezing Temperature(°C)
20 30 Antifreeze Solution Density(%)
40 50
-20
-30
-40
B06RW018
1,100
20 10 30 4060%
50%
40%
20%
10%
30%
Antifreeze Solution Temperature(°C) 50 60 70 0
Specific Gravity
1,090
1,080
1,070
1,060
1,050
1,040
1,030
1,020
1,010
1,000
B06RW017

6B – 6 ENGINE COOLING
REMOVAL
1. Drain coolant.
2. AC Generator Drive Belt
1) Loosen AC Generator mounting bolt, adjust
plate lock bolt, and remove the drive belt.
3. Cooling Fan Assembly
1) Remove lock nut and take out cooling fan
assembly with cooling fan clutch.
4. Water Pump Assembly
INSPECTION
Make necessary repair and parts replacement if
excessive wear or damage is found during inspection.
Should any of the following problems occur, the entire
water pump assembly must be replaced.
1) Cracks in the water pump body
2) Coolant leakage from the seal unit
3) Excessive play in radial direction or abnormal noise
4) Excessive play in thrust direction
Limit : 0.2mm (0.008in) or less
5) Cracks or corrosion in the impeller
INSTALLATION
1. Gasket
1) Set gasket to gear case.
2. Water Pump Assembly
1) Install water pump assembly, and tighten to
specified torque.Torque: 20 N·m (2.0 kg·m/14.5 lb ft)
3. Cooling Fan Assembly
1) Install cooling fan assembly, and tighten to
specified torque.
Torque: 8 N·m (0.8 kg·m/5.8 lb ft)
4. AC Generator Drive Belt
1) Install AC Generator drive belt and adjust belt
tension.
Torque: 40 N·m (4.1 kg·m/29.7 lb ft)
For ACG to bracket
20 N·m (2.0 kg·m/14.5 lb ft)
For ACG to adjust plate
5. Fill coolant to specified capacity.
12
Legend
(1) Fan Pulley
(2) Water Pump Assembly
030RW009
ON-VEHICLE SERVICE
WATER PUMP