air suspension ISUZU TROOPER 1995 Workshop Manual

•:1
SECTION TABLE OF CONTENTS
. GENERAL INFORMATION OA General Information OB Maintenance and Lubrication
WORKSHOP MANUAL
HEATING AND AIR CONDITIONING 1A Heating and Ventilation
1B Air Conditioning 1D Compressor Overhaul
TROOPER
FRAME, BUMPERS AND SHEET METAL
2A Frame 2B Bumpers
(UX) 2C Sheet Metal
STEERING, SUSPENSION, WHEELS AND TIRES
3 Diagnosis 3A Front End Alignment 3B1 Power Steering Gear and Pump 3B3 Steering Linkage 3C Front Suspension 3D Rear Suspension 3E Wheels and Tires 3F4 Supplemental Restraint System Steering Wheel
FOREWORD and Column
PROPELLER SHAFT AND AXLE 4A Propeller Shaft This manual includes special notes, important points, service 4B Rear Axle
data, precautions, etc. that are needed for the maintenance, 4C Front Driving Axle
adjustments, service, removal and installation of vehicle BRAKES components. 5A Hydraulic Brakes
·~ m rmation, illustrations and specifications contained in 5A1 Brake Booster System
.. _,. 5A2 Disc Brakes ~ this ma. ~-based D.fl the latest product information 5A3 Rear Wheei_Antilock Brake System (RWAL)
available at the tirrHHrl·publication. 5A4 4-wheel Antilock Brake System (ABS)
5C Parking Brakes All rights are reserved to make changes at any time without ENGINE notice. 6· Engine General Information Arrangement of the material is shown in the table of contents &A General Engine Mechanical
on the right-hand side of this page. A black spot on the first 6A1 3.2L VB Engine
page of each section can be seen on the edge of the book &B Engine Cooling
6C Engine Fuel below each section title. These point to a more detailed table &D Engine Electrical of contents preceding each section. 6D1 Battery 6D2 Cranking System
This manual applies to 1995 models. 6D3 Charging System 6D4-Ignition System 6E2. Driveability and Emissions 6F Engine Exhaust
TRANSMISSION 7A-Automatic Transmission (4L30·E) 7B Manual Transmission 7C Clutch 7D Transfer Case
8 CHASSIS ELECTRICAL
ACCESSORIES 9A Radio 9B Cruise Control 9J Supplemental Restraint System (SRS)-AIR BAG
10 BODY
APPENDIX A CONVERSION TABLES PUBLICATION NO. UXOO-WSM-L0001-00
APPENDIXB HYDRAULIC CIRCUIT DIAGRAM (Automatic Transmission)
© 1994 ISUZU MOTORS LIMITED

OB-6 MAINTENANCE AND LUBRICATION
BRAKE SYSTEMS OPERATION
Watch for the "BRAKE" light coming on. Other
signs of possible brake trouble are such things as
repeated pulling to one side when braking, unusual
sounds
when braking or between brake
applications,
or increased brake pedal travel. If you
note one of these conditions, repair the system at
once.
For convenience, the
following should be done
when wheels are removed for rotation: Inspect lines
and hoses
for proper hookup, bindings, leaks, crack,
chafing etc.
Inspect disc brake pads for wear and
rotors
for surface condition.
Inspect other brake parts, including parking brake
drums, linings etc., at the same time. Check parking
brake adjustment.
Inspect brakes more often if habit or
conditions
result in frequent braking.
PARKING BRAKE AND TRANSMISSION
PARK MECHANISM OPERATION
Park on a fairly steep hill and hold the vehicle with
the parking brake only. This checks holding ability.
On
automatic transmission vehicles, shifting from
"P" position to the other positions cannot be made
unless
the brake pedal is depressed when the key
switch is in
"ON" position or the engine running.
WARNING
•
Before checking starter safety switch
operation below,
be sure to have enough
room around the
vehicle. Then firmly apply
both the parking brake and the regular brake.
Do not
use the accelerator pedal. If the engine
starts, be ready
to turn off the key promptly.
Take these precautions because the vehicle
could move
without warning and possibly
cause personal injury
or property damage.
STARTER SAFETY SWITCH OPERATION
(AUTOMATIC TRANSMISSION)
Check by trying to start the engine in each gear
while setting the parking brake and the foot brake.
The starter
should crank only in "P" (Park) or "N"
(Neutral).
STARTER SAFETY SWITCH OPERATION
(MANUAL TRANSMISSION)
To check, place the shift lever in "Neutral", push
the clutch pedal halfway and try to start. The starter
should not crank. The starter should crank only
when the clutch pedal is fully depressed.
ACCELERATOR LINKAGE LUBRICATION
Lubricate the accelerator pedal fulcrum pin with
chassis grease.
STEERING AND SUSPENSION
INSPECTION
Inspect front and rear suspension and steering
system
for damaged, loose or missing parts or signs
of wear. Inspect power steering lines and hoses for
proper hookup, binding, leaks, cracks, chafing, etc.
BODY AND CHASSIS LUBRICATION
Lubricate the key lock cylinders, the hood latch, the
hood and door hinges, the door check link, the
parking cable guides,
the underbody contact points,
and the linkage.
PROPELLER SHAFT INSPECTION AND
LUBRICATION
Lubricate sliding yoke and universal joints with
grease containing MOS2 (disulfide molybdenum
type grease) at the interval shown in the
Maintenance Schedule. Check for play in normal
direction of rotation of sliding yoke and universal
joints. Also check
propeller shaft flange-to-pinion
bolts for proper torque of 63 N·m (46 lb·ft) for front
and rear propeller shaft.
AUTOMATIC TRANSMISSION FLUID
INSPECTION
Check the lubricant level every 7,500 miles (12,000
km) and add lubricant
if necessary.
Under harsh operating conditions, such as constant
driving in heavy city traffic during
hot weather, or in
hilly or mountainous terrain, change the transmission
fluid and service the
sump filter after every 20,000
miles (32,000 km) of operation.
AUTO CRUISE CONTROL INSPECTION
Check to see if the clearance between cruise link and
accelerator is normal. Also check that the vacuum
hoses are routed and connected properly.
CLUTCH LINES AND HOSES INSPECTION
Check lines and hoses for proper attachment,
binding, leaks, cracks, chafing, deterioration, etc.
Any questionable parts should be replaced or
repaired at once. When abrasion or wear is evident
on lines or hoses, the cause must be corrected.
..

3-2 DIAGNOSIS
GENERAL DIAGNOSIS
Condition Possible Cause Correction
Vehicle
Pulls 1. Mismatched or uneven tires. Replace tire.
2. Tires not adequately inflated. Adjust tire pressure.
3. Broken or sagging springs. Replace spring.
4. Radial tire lateral force. Replace tire.
5. Improper wheel alignment. Adjust wheel alignment.
6. Brake dragging in one wheel. Repair brake.
7. Loose, bent or broken front or rear suspension Tighten or replace the
parts. appropriate suspension
part(s).
8. Faulty shock absorbers. Replace shock absorber.
Abnormal or Excessive 1. Sagging or broken spring. Replace spring.
Tire Wear
2. Tire out of balance. Balance or replace tire.
3. Improper wheel alignment. Check front end alignment.
4. Faulty shock absorber. Replace shock absorber.
5. Hard driving. Replace tire.
6. Overloaded vehicle. Replace tire
and reduce
load.
7. Tires not rotated periodically. Replace or rotate
tire.
8. Worn or loose road wheel bearings. Replace wheel bearing.
9. Wobbly wheel or tires. Replace wheel or tire.
10. Tires not adequately inflated. Adjust the pressure.
Wheel Tramp or Hop 1. Blister or bump on tire. Replace tire.
2. Improper shock absorber operation. Replace shock absorber.
Shimmy,
Shake or 1. Tire or wheel out of balance. Balance
wheels or replace
Vibration tire/or wheel.
2. Loose wheel bearings. Replace wheel bearing.
3. Worn steering linkage ball joints. Replace ball joints.
4. Worn upper or lower end ball joints. Replace ball joints.
5. Excessive wheel runout. Repair or replace
wheel
and/or tire.
6. Blister or bump on tire. Replace tire.
7. Excessive loaded radial runout of tire/wheel Replace tire or wheel.
assembly.
8. Improper wheel alignment. Check
wheel alignment.
9. Loose or worn steering linkage. Tighten or replace steering
linkage.
10. Loose steering gear. Tighten
housing bolts.
11. Tires not adequately inflated. Adjust tire pressure.
12. Loose, bent or broken front or rear Tighten or replace the
suspension parts. appropriate suspension
parts.
13. Faulty shock absorber. Replace shock absorber.
14. Hub bearing preload misadjustment. Adjust preload.
Hard Steering 1. Bind in steering linkage ball studs, upper or Replace ball joint.
lower end ball joint.
2. Improper wheel alignment. Check wheel alignment.
3. Steering gear misadjustment. Check and adjust pinion
torque.
4. Tire not adequately inflated. Inflate tires to proper
pressure.
5. Bind in steering column or shaft. Repair or replace.
6. Improper power steering
system operation. Repair or replace.
Refer to "Power steering
system diagnosis"
'· •

DIAGNOSIS 3-3
Condition Possible Cause Correction
Too
Much Play In 1. Wheel bearings worn. Replace wheel bearings.
Steering
2. Loose steering gear or linkage. Retighten or repair.
3. Steering
gear misadjustment. Inspect and adjust steering
gear preload.
4. Worn or loose steering shaft universal joint. Retighten or replace
steering shaft.
5. Worn steering linkage ball joints. Replace ball joints.
6. Worn upper or lower end ball joints. Replace ball joints.
Poor Steering
Wheel 1. Bind in steering linkage ball joints. Replace ball joints.
Returnability 2. Bind
in upper or lower end ball joints. Replace ball joints.
3. Bind
in steering column and shaft. Repair
or replace.
4. Bind in steering gear. Check and repair steering
gear.
5. Improper wheel alignment. Adjust wheel alignment.
6. Tires not adequately
inflated. Adjust
pressure.
7. Loose steering wheel nut. Retighten.
8. Worn wheel bearing.
Replace.
Abnormal Noise
1. Worn, sticky or loose upper or lower end ball Replace.
joint, steering linkage
ball joints or drive axle
joints.
2. Faulty shock absorbers.
Replace.
3. Worn upper or lower control arm bushing.
Replace.
4. Loose stabilizer bar. Retighten bolts or replace
bushings.
5. Loose wheel nuts. Tighten nuts. Check for
elongated wheel nut holes.
Replace
wheel if required.
6. Loose suspension bolts or nuts. Retighten suspension bolts
or nuts.
7. Broken or otherwise damaged wheel bearings. Replace wheel bearing.
8. Broken suspension springs. Replace spring.
9. Loose steering gear. Retighten mounting bolt.
10. Faulty steering gear. Check and adjust steering
gear.
Wandering
or Poor 1. Mismatched or unevenly worn tires. Replace tire or inflate tires
Steering
Stability to proper pressure.
2. Loose steering linkage ball joints. Replace ball joints.
3. Faulty shock absorbers. Replace shock absorber.
4. Loose stabilizer bar. Tighten or replace stabilizer
bar or bushings.
5. Broken or sagging springs. Replace spring (pairs).
6. Steering gear misadjustment. Check or adjust steering
gear.
7. Improper wheel alignment.
Adjust wheel alignment.

3-4 DIAGNOSIS
Condition Possible Cause Correction
Erratic Steering When 1. Worn wheel bearings. Replace wheel bearings.
Braking
2. Broken or sagging springs. Replace spring (pairs).
3. Leaking caliper. Repair or replace caliper.
4. Warped discs. Replace brake disc.
5. Badly worn brake pads. Replace brake pads.
6. Tires are inflated unequally. Inflate tires to proper
pressure.
Low or Uneven Trim
1. Broken or sagging springs. Replace springs (In pairs)
Height
2. Vehicle overloaded. Reduce load.
3. Incorrect springs. Adjust or replace torsion
bar.
Suspension Bottoms
1. Vehicle overloaded. Reduce load.
2. Faulty shock absorber. Replace shock absorber
3. Incorrect, broken or sagging springs. Replace springs.
Body Leans
1. Loose stabilizer bar. Tighten stabilizer bar bolts
or replace bushings.
2. Faulty shock
absorber, struts or mounting. Replace shock absorber.
3. Broken or sagging springs. Replace springs (In pairs)
4. Vehicle overloaded. Reduce load.
Cupped Tires 1. Worn wheel bearings. Replace wheel bearing.
2. Excessive tire or wheel run-out. Replace tire or wheel.
3. Worn ball joints. Replace ball joints.
4. Tire out of balance. Adjust tire balance.
•

POWER STEERING SYSTEM TEST
TEST PROCEDURE
Test of fluid pressure in the power steering system is
performed to determine whether
or not the oil pump
and
power steering unit are functioning normally.
The power steering system test is method used to
identify and
isolate hydraulic circuit difficulties. Prior
to performing this test, the following inspections and
corrections,
if necessary, must be made.
[!) INSPECT
• Pump reservoir for proper fluid level.
•
Pump belt for proper tension.
• Pump driver pulley condition.
1. Place a container under the pump to catch the
fluid when disconnecting or connecting the
hoses.
2. With the engine NOT running, disconnect the
pressure hose
at the power steering pump and
install Power Steering tester (Fig. 3B1-3).
The gage
must be between the shutoff valve and
pump.
Open the shutoff valve.
li5\l Tester: J-29877-A
~ Adapter: J-39213
3. Check the fluid level. Fill the reservoir with power
steering fluid, to the "Full" mark. Start the engine
and,
momentarily holding steering wheel against
stop, check the connections at tester
for leakage.
4. Bleed the system. Refer to "Bleeding the Power
Steering
System".
POWER STEERING GEAR AND PUMP 381-3
5. Start the engine and check the pump fluid level.
And power steering fluid if required. When the
engine is at
normal operating temperature,
increase engine speed to 1500 rpm.
U7 CAUTION:
VI Do not leave shutoff valve fully closed for more
than 5 seconds,
as the pump could become
damaged
internally.
6. Fully close the shutoff valve. Record the highest
pressures.
• If the pressure recorded is within 9300-9800
kPa (1350-1420 psi), the pump is functioning
within its specifications.
• If the pressure recorded is higher than 9800 kPa
(1420 psi), the valve in the pump is defective.
• If the pressure recorded is lower than 9300 kPa
(1350 psi), the valve or the rotating group in the
pump is defective.
7. If the pump checks within specifications, leave the
valve open and turn (or have someone else turn)
the steering
wheel fully in both directions. Record
the highest pressures and compare
with the
maximum pump pressure recorded in step
6. If
this pressure cannot be built in either (or one) side
ofthe gear, the gear is leaking internally and must
be disassembled and repaired.
8. Shut the engine off, remove the testing gage,
reconnect the pressure hose, check the
fluid level
and make the needed repairs.
9. If the problem still exists, the steering and front
suspension must be thoroughly examined.
Shut off Valve
J-29877-A
Oil Pressure Gauge
J-29877-A
Fig. 3B1-3

FRONT SUSPENSION 3C-3
ON-VEHICLE SERVICE
SHOCK ABSORBER
Fig. 3C-2
1••1 REMOVAL
Preparation: • Raise the vehicle and support it with
suitable safety stands.
'W' • Remove wheel and tire assembly.
Refer to "Wheels and Tires" in
section
3E.
1. Bolt, nut and washer
2. Nut
3. Rubber bushing and washer
4. Shock absorber
5. Rubber bushing and washer
IL'it'l INSPECTION AND REPAIR
Make necessary correction or parts replacement if
wear, damage, corrosion or any other abnormal
condition are found through inspection.
• Shock absorber
• Rubber bushing
EJ
5.
4.
3.
2.
~
1.
~
Removal steps
1.
Bolt, nut and washer 2. Nut
3. Rubber bushing and washer
4.
Shock absober 5. Rubber bushing and washer
Installation steps To install, follow the removal steps in the reverse order.
INSTALLATION
Rubber bushing and washer
Shock absorber
Rubber bushing and washer
Nut
Torque N-m (lb·ft) 20 (14)
Bolt, nut and washer
Torque N-m (lb·ft) 82 (61)

3C-4 FRONT SUSPENSION
STABILIZER BAR
5
l
3
Removal steps
1. Nut and washer
2. Link 3. Bracket
4. Stabilizer bar 5. Rubber bushing
Installation steps To install, follow the removal steps in the reverse order.
Fig. 3C-3
1••1 REMOVAL
Preparation: • Raise the vehicle and support the
frame
with suitable safety stands.
• Remove the stone guard.
• Remove wheel and tire assembly.
Refer to "Wheels and Tires" in
section
3E.
1. Nut and washer
W CAUTION:
VI Be careful not to break the ball joint boot.
2. Link
3. Bracket
4. Stabilizer bar
5. Rubber bushing
~ INSPECTION AND REPAIR
Make necessary correction or parts replacement if
wear, damage, corrosion or any other abnormal
condition are found through inspection.
• Stabilizer bar
• Rubber bushing
• Link ball joint
1••1 INSTALLATION
5. Rubber bushing
4. Stabilizer bar
3. Bracket
~ Torque N·m (lb·ft) 22 (16)
2. Link
1. Nut and washer
~ Torque N-m (lb·ft) 50 (37)
..

3C-6 FRONT SUSPENSION
(L!] INSPECTION AND REPAIR
Make necessary correction or parts replacement if
wear, damage, corrosion or any other abnormal
condition are found through inspection.
Check the following parts:
• Torsion bar
• Height control arm
• Adjust bolt
• Rubber seat
1•+1 INSTALLATION
3. Torsion bar
8 • Make sure the bars are on their correct
respective sides (Fig.
3C-8).
1-ool • Apply grease to the serrated portions.
• Align the setting marks (Fig. 3C-9).
Fig. 3C-8
Fig. 3C-9
2. Height control arm
§]•
u:
Apply grease to the portion that fits into the
bracket.
Align the setting marks (Fig. 3C-1 0).
Apply grease to the bolt portion of the end
piece.
r::=;] • Apply grease to the portion of the seat that fits
D into the bracket (Fig. 3C-11 ).
1-ool • Apply grease to the serrated portions.
Fig.
3C-10
Fig. 3C-11
1. Adjust bolt and seat (Fig. 3C-12)
• Turn the adjust bolt to the setting mark applied
during disassembly.
NOTE:
Adjust the trim height. Refer to "Front End Alignment"
in section 3A.
Setting mark
Fig. 3C-12
IIIII

3C-8 FRONT SUSPENSION
6. Oil seal
7. Washer
8. Needle bearing (Fig. 3C-16)
1®.1 Remover: J-23907
9. Knuckle
Fig. 3C-14
Fig. 3C-15
Fig. 3C-16
J-29107
11!) INSPECTION AND REPAIR
Make necessary correction or parts replacement if ~
wear, damage, corrosion or any other abnormal
condition are found through inspection.
Check the
following parts:
• Knuckle
• Knuckle arm
• Needle bearing
• Thrust washer
•