Daewoo Matiz (2003 year). Manual - part 107

SUSPENSION DIAGNOSIS  2A – 5

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Condition

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Probable Cause

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Correction

Steering Wheel

D

Air in the power steering system.

D

Bleed the power steering system.

Kickback (Power)

D

A loose steering gear mounting.

D

Tighten the steering gear mounting
bracket bolts.

D

Loose connections or wear of the joint
from the steering column to the
intermediate shaft.

D

Loose connections or wear of the joint
from the intermediate shaft to the
steering gear.

D

Tighten the coupling pinch bolts.

D

Replace the intermediate shaft as
needed.

D

Loose tie rod ends.

D

Tighten the tie rod ends.

D

Replace the tie rods as needed.

D

Loose or worn wheel bearings.

D

Tighten the drive axle nut.

D

Replace the wheel bearing as needed.

Steering Wheel Surges
or Jerks (Power)

D

Low pressure in the power steering
system.

D

Replace the seals and the hoses as
needed.

D

A sluggish steering gear valve.

D

Clean the pinion valve assembly.

D

Replace the pinion valve assembly as
needed.

D

A loose power steering pump drive
belt.

D

Adjust the power steering pump drive
belt.

Cupped Tires

D

The front–wheel and the rear–wheel
alignment are out–of–align.

D

Align the front and the rear wheels.

D

Worn strut dampeners.

D

Replace the strut dampeners.

D

Worn or loose wheel bearing.

D

Tighten the drive axle nut.

D

Replace the wheel bearings as
needed.

D

Excessive tire or wheel runout.

D

Match–mount the tires.

D

Replace the tires as needed.

D

Replace the wheels as needed.

D

A worn ball joints.

D

Replace the control arm and ball joint
assembly.

D

The steering gear preload adjustment
is out–of–adjustment.

D

Perform a rack bearing preload
on–vehicle adjustment.

2A – 6  SUSPENSION DIAGNOSIS

WHEEL BEARING DIAGNOSIS

This vehicle with non–serviceable bearings in the rear
wheels. If any fault is found with a wheel bearing, it must
be replaced.

Wheel Bearing Noise

A road test usually reveals excessive wheel bearing
noise. Wheel bearings emit a howling sound when loose
or damaged. Wheel bearing noise is present only when
the vehicle is moving. It is constant and unwavering and
increases with the speed of the vehicle. If the wheel
bearing noise cannot be positively diagnosed, or if the

origin of the noise cannot be determined, perform the
following test :

1. Raise and suitably support the vehicle.

2. Spin the wheels using your hand. Check for out–of–

round or out–of–balance tires, bent rims, or loose
wheel bearings.

3. Spin the rear wheels using a commercial wheel spin-

er.

4. If a noise can be heard from the passenger compart-

ment, replace the noisy wheel bearings. Refer to Sec-
tion 2D, Rear Suspension.

5. Lower the vehicle.

 

SECTION 2B

WHEEL ALIGNMENT

TABLE OF CONTENTS

Description and Operation

2B-2

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Four Wheel Alignment

2B-2

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Toe

2B-2

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Caster

2B-2

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Camber

2B-2

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Steering Axis Inclination

2B-3

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Included Angle

2B-3

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Scrub Radius

2B-3

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Setback

2B-3

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Turning Angle

2B-3

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Diagnostic Information and Procedures

2B-4

. . . . . 

Tire Diagnosis

2B-4

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Front Toe Adjustment

2B-5

. . . . . . . . . . . . . . . . . . . . . . 

Front Camber and Caster Check

2B-5

. . . . . . . . . . . . 

Rear Camber Check

2B-5

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Rear Toe Check

2B-5

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Specifications

2B-6

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Wheel Alignment Specifications

2B-6

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Fastener Tightening Specifications

2B-6

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2B – 2  WHEEL ALIGNMENT

DESCRIPTION AND OPERATION

FOUR WHEEL ALIGNMENT

The first responsibility of engineering is to design safe
steering and suspension systems. Each component
must be strong enough to withstand and absorb extreme
punishment. Both the steering system and the front and
the rear suspension must function geometrically with the
body mass.

The steering and the suspension systems require that
the front wheels self-return and that the tire rolling effort
and the road friction be held to a negligible force in order
to allow the customer to direct the vehicle with the least
effort and the most comfort.

A complete wheel alignment check should include mea-
surements of the rear toe and camber.

Four-wheel alignment assures that all four wheels will be
running in precisely the same direction.

When the vehicle is geometrically aligned, fuel economy
and tire life are at their peak, and steering and perfor-
mance are maximized.

TOE

D16A006A

Toe–in is the turning in of the tires, while toe–out is the
turning out of the tires from the geometric centerline or
thrust line. The toe ensures parallel rolling of the wheels.

The toe serves to offset the small deflections of the
wheel support system which occur when the vehicle is
rolling forward. The specified toe angle is the setting
which achieves–degrees (0

_

) of toe when the vehicle is

moving.

Incorrect toe-in or toe-out will cause tire wear and re-
duced fuel economy. As the individual steering and sus-
pension components wear from vehicle mileage,
additional toe will be needed to compensate for the
wear.

Always correct the toe dimension last.

CASTER

D16A008A

Caster is the tilting of the uppermost point of the steering
axis either forward or backward from the vertical when
viewed from the side of the vehicle. A backward tilt is
positive, and a forward tilt is negative. Caster influences
directional control of the steering but does not affect tire
wear. Weak springs or overloading a vehicle will affect
caster. One wheel with more positive caster will pull to-
ward the center of the car. This condition will cause the
car to move or lean toward the side with the least
amount of positive caster. Caster is measured in de-
grees and is not adjustable.

CAMBER

D16A007A

Camber is the tilting of the top of the tire from the vertical
when viewed from the front of the vehicle. When the
tires tilt outward, the camber is positive. When the tires
tilt inward, the camber is negative. The camber angle is
measured in degrees from the vertical. Camber in-
fluences both directional control and tire wear.

If the vehicle has too much positive camber, the outside
shoulder of the tire will wear. If the vehicle has too much
negative camber, the inside shoulder of the tire will wear.
Camber is measured in degrees and is not adjustable.