ISUZU TROOPER 1998 Service Repair Manual

6A±95
ENGINE MECHANICAL
Engine mount
N´m (Kg´m/Ib ft)
E06RW040

6A±96
ENGINE MECHANICAL
Special Tool
ILLUSTRATIONTOOL NO.
TOOL NAME
5±8840±0011±0
(J±21687±02)
Remover; tie rod end
5±8840±2441±0
Set Number of Valve
Compressor
5±8840±2446±0
(J±8062)
Compressor; Valve
Spring (1)
5±8840±2547±0
(J±42898)
Adapter; Compressor
Valve Spring (2)
5±8840±0623±0
(J±37281)
Remover; Oil controller
5±8840±0624±0
(J±38537)
Installer; Oil controller
5±8840±2445±0
(J±42985)
Installer; Camshaft oil
seal
5±8840±2545±0
(J±39206)
Installer; Pilot bearing
ILLUSTRATIONTOOL NO.
TOOL NAME
5±8840±0133±0
(J±8614±01)
Holder; Crankshaft
5±8840±2153±0
(J±37228)
Seal cutter
5±8840±2286±0
(J±39201)
Installer; Real oil seal
9±8511±4209±0
(J±24239±1)
Cylinder head bolt
wrench
5±8840±2442±0
(J±42899)
Replacer; Valve guide
(set) (1,2)
5±8840±2548±0
(J±42687)
Installer; Valve guide (1)
5±8840±2549±0
(J±37985±1)
Remover; Valve guide
(2)
5±8840±2444±0
(J±42689)
Adjusting Tool: Valve
clearance

6A±97
ENGINE MECHANICAL
ILLUSTRATIONTOOL NO.
TOOL NAME
5±8840±2443±0
(J±42686)
Lever; Gear spring
5±8840±2447±0
(J±43041)
Holder; Universal

ENGINE COOLING6B±1
ENGINE
ENGINE COOLING
CONTENTS
Service Precaution 6B±1. . . . . . . . . . . . . . . . . . . . . .
General Description 6B±2. . . . . . . . . . . . . . . . . . . . .
Diagnosis 6B±5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Draining and Refilling Cooling System 6B±6. . . . .
Water Pump 6B±7. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Pump and Associated Parts 6B±7. . . . . . .
Removal 6B±7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection 6B±7. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 6B±7. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermostat 6B±8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermostat and Associated Parts 6B±8. . . . . . . .
Removal 6B±8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection 6B±8. . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation 6B±8. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Radiator 6B±9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Radiator and Associated Parts 6B±9. . . . . . . . . .
Removal 6B±9. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection 6B±10. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 6B±11. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drive Belt and Cooling Fan 6B±12. . . . . . . . . . . . . . .
Drive Belt and Associated Parts 6B±12. . . . . . . . .
Inspection 6B±12. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 6B±12. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Data and Specifications 6B±13. . . . . . . . . . . . .
Special Tool 6B±14. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Precaution
WARNING: I F S O E Q U IPPED WITH A
SUPPLEMENTAL RESTRAINT SYSTEM (SRS),
REFER TO THE SRS COMPONENT AND WIRING
LOCATION VIEW IN ORDER TO DETERMINE
WHETHER YOU ARE PERFORMING SERVICE ON OR
NEAR THE SRS COMPONENTS OR THE SRS
WIRING. WHEN YOU ARE PERFORMING SERVICE
ON OR NEAR THE SRS COMPONENTS OR THE SRS
WIRING, REFER TO THE SRS SERVICE
INFORMATION. FAILURE TO FOLLOW WARNINGS
COULD RESULT IN POSSIBLE AIR BAG
DEPLOYMENT, PERSONAL INJURY, OR
OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.
CAUTION: Always use the correct fastener in the
proper location. When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal. ISUZU will also call out
the fasteners that require thread lockers or thread
sealant. UNLESS OTHERWISE SPECIFIED, do not
use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or
fastener joint interfaces. Generally, such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener. When
you install fasteners, use the correct tightening
sequence and specifications. Following these
instructions can help you avoid damage to parts and
systems.

6B±2
ENGINE COOLING
General Description
030RW001
Legend
(1) Water Pump
(2) Thermostat
(3) Radiator
(4) Reserve Tank
(5) Cooling Fan
(6) Cylinder Block(7) Cylinder Head
(8) Right Bank
(9) Throttle Body
(10) Cylinder Block
(11) Cylinder Head
(12) Left Bank
(13) Heater
The cooling system is a pressurized Engine Coolant (EC)
forced circulation type which consists of a water pump,
thermostat cooling fan, radiator and other components.
The automatic transmission fluid is cooled by the EC in
radiator.
Water Pump
The EC pump is a centrifugal impeller type and is driven
by a timing belt.
030RS001

ENGINE COOLING6B±3
Thermostat
The thermostat is a wax pellet type with a air hole(1) and is
installed in the thermostat housing.
031RW002
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 88.2 ~ 117.6
kPa (12.8 ~ 17.0 psi) pressure. (No oil cooler provided for
M/T)
110RS001
Anti Freeze Solution

Relation between the mixing ratio and freezing
temperature of the EC varies with the ratio of
anti±freeze solution in water. Proper mixing ratio can
be determined by referring 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.

Calculating mixing ratio
F06RW005

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±5
Diagnosis
Engine Cooling Trouble
ConditionPossible causeCorrection
Engine overheatingLow Engine Coolant levelReplenish
Incorrect fan installedReplace
Thermo meter unit faultyReplace
Faulty thermostatReplace
Faulty Engine Coolant temperature
sensorRepair or replace
Clogged radiatorClean or replace
Faulty radiator capReplace
Low engine oil level or use of
improper engine oilReplenish or change oil
Clogged exhaust systemClean exhaust system or replace
faulty parts
Faulty Throttle Position sensorReplace throttle valve assembly
Open or shorted Throttle Position
sensor circuitRepair or replace
Damaged cylinder head gasketReplace
Engine overcoolingFaulty thermostatReplace
Engine slow to warm±upFaulty thermostatReplace
Thermo unit faultyReplace

6B±6
ENGINE COOLING
Draining and Refilling Cooling
System
Before draining the cooling system, inspect the system
and perform any necessary service to ensure that it is
clean, does not leak and is in proper working order. The
engine coolant (EC) level should be between the ªMINº
and ªMAXº lines of reserve tank when the engine is cold.
If low, check for leakage and add EC up to the ªMAXº line.
There should not be any excessive deposit of rust or
scales around the radiator cap or radiator filler hole, and
the EC should also be free from oil.
Replace the EC if excessively dirty.
1. Completely drain the cooling system by opening the
drain plug (2) at the bottom of the radiator.
110RW002
2. Remove the radiator cap.
WARNING: T O AV O I D T H E D A N G E R O F B E I N G
BURNED, DO NOT REMOVE THE CAP WHILE THE
ENGINE AND RADIATOR ARE STILL HOT.
SCALDING FLUID AND STEAM CAN BE BLOWN OUT
UNDER PRESSURE.
3. Disconnect all hoses from the EC reserve tank.
Scrub and clean the inside of the reserve tank with
soap and water. Flush it well with clean water, then
drain it. Install the reserve tank and hoses.
4. Refill the cooling system with the EC using a solution
that is at least 50 percent antifreeze but no more than
70 percent antifreeze.
5. Fill the radiator to the base of the filler neck.
Fill the EC reserve tank to ªMAXº line when the engine
is cold.
6. Block the drive wheels and firmly apply the parking
brake. Shift an automatic transmission to ªPº (Park)
or a manual transmission to neutral.
7. Remove the radiator cap. Start the engine and warm
it up at 2,500 ~ 3,000 rpm for about 30 minutes.
8. When the air comes out from the radiator filler neck
and the EC level has gone down, replenish with the
EC. Repeat this procedure until the EC level does not
go down. Then stop the engine and install the radiator
cap. Let the engine cool down.9. After the engine has cooled, replenish with EC up to
the ªMAXº line of the reserve tank.
10. Start the engine. With the engine running at 3,000
rpm, make sure there is no running water sound from
the heater core (behind the center console).
11. If the running water sound is heard, repeat steps 8 to
10.

ENGINE COOLING6B±7
Water Pump
Water Pump and Associated Parts
030RS002
Legend
(1) Timing Belt
(2) Idle Pulley(3) Water Pump Assembly
(4) Gasket
Removal
1. Disconnect battery ground cable.
2. Drain coolant.
3. Radiator hose (on inlet pipe side).
4. Remove timing belt. Refer to ªTiming Beltº in this
manual.
5. Remove Idle pulley.
6. Remove water pump assembly.
7. Remove gasket.
Inspection
Make necessary repair and parts replacement if extreme
wear or damage is found during inspection. Should any of
the following problems occur, the entire water pump
assembly must be replaced:

Crack in the water pump body

EC leakage from the seal unit

Play or abnormal noise in the bearing

Cracks or corrosion in the impeller.
Installation
1. Install gasket, clean the mating surface of gasket
before installation.2. Install water pump assembly and tighten bolts to the
specified torque.
Torque: 25 N´m (2.5 Kg´m/18 lb ft)

Tightening order
The tightening order are in the illustrate.
NOTE: To prevent the oil leakage, apply the LOCTITE
262 or an equivalent, to the arrow marked fixing bolt
thread.
030RW008