tires ISUZU KB P190 2007 Workshop Repair Manual

STEERING SUSPENSION WHEELS AND TIRES 3-1
SECTI ON 3
STEERING SUSPENSION
TA BLE OF CONTENTS
Section 3A Front A lignment ................................................... ...................................... 249
PA
GE
Section 3B Power Assited Steering System ............................................................... 262
Section 3C Front Suspension ............................................................................... ...... 320

Section 3D Rear Suspension ................................................. ....................................... 3 85
Section 3E Wheels and Tires ................................................. ....................................... 405
WHEELS AND TIRES
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ISUZU KB P190 2007

3A-2 FRONT ALIGNMENT

Front End Alignment Inspection and
Adjustment
General Description
“Front End Alignment” refers to the angular relationship
between the front wheels, the front suspension attaching parts
and the ground.
Proper front end alignment must be maintained in order to
insure efficient steering, good directional stability and to
prevent abnormal tire wear.
The most important factors of front end alignment are wheel
toe-in, wheel camber and axle caster.





Camber:
This illustration shows a view from the front of the vehicle.
Camber is the vertical tilting inward or outward of the front
wheels. W hen the wheels tilt outward at the top, the camber is
positive (+). W hen the wheels tilt inward at the top, the camber
is negative (-). The amount of tilt measured in degrees from
the vertical is called the camber angle (1). If camber is extreme
or unequal between the wheels, improper steering and
excessive tire wear will result. Negative camber causes wear
on the inside of the tire, while positive camber causes wear to
the outside.



Caster:
This illustration shows a view from the side of the vehicle.
Caster (1) is the vertical tilting of the wheel axis either
forward or backward (when viewed from the side of the
vehicle). A backward tilt is positive (+) and a forward tilt is
negative (-). On the short and long arm type suspension
you cannot see a caster angle without a special instrument, but
if you look straight down from the top of the upper control arm
to the ground, the ball joints do not line up (fore and aft) when
a caster angle other than 0 degrees is present. W ith a positive
angle, the lower ball joint would be slightly ahead (toward the
front of the vehicle) of the upper ball joint center line.



Toe-in:
This illustration shows a view from the top of the vehicle.
Toe-in is the measured amount the front wheels are turned in.
The actual amount of toe-in is normally a fraction of a degree.
Toe-in is measured from the center of the tire treads or from
the inside of the tires. The purpose of toe-in is to insure parallel
rolling of the front wheels and to offset any small deflections of
the wheel support system which occurs when the vehicle is
rolling forward. Incorrect toe-in results in excessive toe-in and
unstable steering. Toe-in is the last alignment to be set in
the front end alignment procedure.

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ISUZU KB P190 2007

FRONT ALIGNMENT 3A-3

Inspection
Before making any adjustments affecting caster, camber or
toe-in, the following front end inspection should be made.
1. Inspect the tires for proper inflation pressure. Refer to
Main Data and Specifications in W heel and Tire System section.
2. Make sure that the vehicle is in an unladen condition (W ith no passengers or loading).
3. Make sure that the spare tire is installed at the normal position.
4. Inspect the front wheel bearings for proper adjustment. Refer to Front Hub and Disc Overhaul in Suspension
section.
5. Inspect the ball joints and tie rod ends. If excessive looseness is noted, correct before adjusting. Refer to
Steering Linkage in this section.
6. Inspect the wheel and tires for run-out. Refer to W heel Replacement in W heel and Tire System section.
7. Inspect the trim height. If not within specifications, the correction must be made before adjusting caster.
8. Inspect the steering unit for looseness at the frame.
9. Inspect shock absorbers for leaks or any noticeable noise. Refer to Shock Absorber in Suspension section.
10. Inspect the control arms or stabilizer bar attachment fo
r
looseness. Refer to Suspension section.
11. Inspect the front end alignment using alignment equipment. Follow the manufacturer’s instructions.
12. Park the vehicle on a level surface.


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ISUZU KB P190 2007

POWER-ASSISTED STEERING SYSTEM 3B-9
4. Install all the lines and hoses. Fill the system with
new power steering fluid and bleed the system as
described in Bleeding the Power Steering System.
Operate the engine for about 15 minutes.
Remove the pump return line at the pump inlet and
plug the connection on the pump. W hile refilling the
reservoir, check the draining fluid for contamination.
If foreign matter is still evident, replace all lines,
disassemble and clean or replace the powe
r
steering system components. Do not re-use any
drained power steering fluid.

Steering Wheel Free Play Inspection
RTW 73BSH000901
1. W ith the tires in the straight-ahead position, check the amount of steering wheel play by turning the
wheel in both directions until the tires begin to move.
NOTE: The wheel free play should be checked with the
engine running. Free play: 0 - 30 mm (0 - 1.18 in)
2.
Also check the steering wheel for play and
looseness in the mount by moving it back and forth
and sideways. W hen test driving, check for hard
steering, steering shimmy and tendency to pull to
one side.

Front End Alignment Inspection and
Adjustment
Toe-in Adjustment
Toe-in: Refer to Section 3A FRONT ALIGNMENT
1. To adjust the toe-in angle, loosen the lock nuts (2) on the tie rod (1) and turn the tie rod. Turn both rods
the same amount, to keep the steering wheel
centered .
431R30006
2. Tighten the lock nut to the specified torque. Torque:
98 N ⋅
⋅⋅
⋅
m (10 kgf ⋅
⋅⋅
⋅
m/72 lb ⋅
⋅⋅
⋅
ft)

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ISUZU KB P190 2007

3C-54 FRONT SUSPENSION
TROUBLESHOOTING
1. VIBRATION, SHOCK, AND SHIMMY OF STEERING WHEEL
Checkpoint Problem Countermeasure



Check front axle


Check wheel alignment


Check suspension ball joint


Check shock absorber or
attaching nut and bolt


Replace


Adjust


Replace


Replace or retighten


Check steering unit and
linkage


Faulty


Worn


Malfunction or loose


Check upper and lower link
bushings
Replace


Adjust


Worn


Incorrect

OK
OK
OK
NG
NG
NG
NG
NG
NG
OK
OK
Check vehicle trim height



• Improperly adjusted or worn front
wheel bearing.
• W orn or incorrectly adjusted wheel
bearing.
Replace; refer to Section 4C "Front
Wheel Drive"

• Insufficiently tightened steering
gear housing.
• W ear of steering linkage.
• Excessive backlash due to
improper adjustment of the steering
gear box.
• W orn column bearing, weakened
column bearing spring, or loose
clamp.
Replace; refer to Section 3B
"Steering"
• Improper tire pressure.
• Imbalance and deformation of frond
wheel.
• Unevenly worn tire or insufficient
tightening of wheel nuts.
Replace; refer to Section 3E "Wheel
and Tires"



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ISUZU KB P190 2007

FRONT SUSPENSION 3C-63
8. EXCESSIVELY OR PARTIALLY WORN TIRE
Checkpoint Problem Countermeasure

Brake adjustment
W heel alignment
Adjust
Adjust
Incorrect
Incorrect
Front wheel bearingReplace
Adjust
Faulty
Improper
OK NG
NG
NG
NG
OK
OKTire pressure
Tire rotationRotate tires at recomended
intervalsNot rotated
OK
NG

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ISUZU KB P190 2007

3D-20 REAR SUSPENSION
4. HARSHNESS
Checkpoint Problem Countermeasure


Bushings in suspension
System


Tire inflation pressure


Retighten or replace


Replace


Adjust


Loosen or broken


Defective


Incorrect


Tires for out of balance

Adjust or replace


Replace tires


Incorrect

Noise does not have any
specific pattern

OK NG
NG
NG
NG
NG
OK
OK Road test vehicle(Noise has a
certain pattern)



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ISUZU KB P190 2007

WHEELS AND TIRES 3E-1
SECTION 3E
WHEELS AND TIRES
TABLE OF CONTENTS
PAGE
Main Data and Specifications ........................................................................................... 3E- 2
Torque Specifications ....................................................................................................... 3E- 3
Special Parts Fixing Nuts and Bolts ........................................................................... 3E- 3
Wheels and Tires ............................................................................................................... 3E- 4
General Description...................................................................................................... 3E- 4
Servicing...................................................................................................................... .. 3E- 6
Disassembly and Reassembly..................................................................................... 3E- 7
Inspection and Repair .................................................................................................. 3E- 8
Troubleshooting ................................................................................................................ 3E- 10


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ISUZU KB P190 2007

3E-2 WHEELS AND TIRES
MAIN DATA AND SPECIFICATIONS
Tire Size and Pressure
Model 4×
××
×
2 Except High Ride Suspension 4×
××
×
2 High Ride Suspension, 4 ×
××
×
4
Tire Size



W heel Size

195R14C
8PR 106/104Q

14 x 5.5JJ


215/70R15C
106/104S

15 x 6.5JJ


225/75R15C
110/108S


15 x 6.5JJ

245/70R16
111S

16 x 7JJ



Tire Pressure
Front kPa (kgf/cm2/psi)
Rear kPa (kgf/cm2/psi) 245 (2.5/36)
441 (4.5/64) 221 (2.25/32)
368 (3.75/53) 221 (2.25/32)
319 (3.25/46) 200 (2.0/28)
270 (2.8/40)


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ISUZU KB P190 2007

WHEELS AND TIRES 3E-3
TORQUE SPECIFICATIONS
SPECIAL PARTS FIXING NUTS AND BOLTS
WHEELS AND TIRES
N⋅m (kgf ⋅m/lb ⋅ft)






RTW 73ELF000101



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ISUZU KB P190 2007