Daewoo Musso. Manual — part 206
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WHEEL ALIGNMENT 2B-5
VIBRATION DIAGNOSIS
Wheel imbalance causes most highway speed vibration
problems. A vibration can remain after dynamic
balancing because:
l
A tire is out of round.
l
A rim is out of round.
l
A tire stiffness variation exists.
Measuring tire and wheel free runout will uncover only
part of the problem, All three causes, known as loaded
radial runout, must be checked using method of
substituting known good tire and wheel assemblies on
the problem vehicle.
Preliminary Checks
Prior to performing any work, always road test the car
and perform a careful visual inspection for:
l
Obvious tire and wheel runout.
l
Obvious drive axle runout.
l
Improper tire inflation.
l
Incorrect trim height.
l
Bent or damaged wheels.
l
Debris build-up on the tire or the wheel.
l
Irregular or excessive tire wear.
l
Improper tire bead seating on the rim,
l
Imperfections in the tires, including: tread
deformations, separations, or bulges from impact
damage. Slight sidewall indentations are normal and
will not affect ride quality.
Tire Balancing
Balance is the easiest procedure to perform and should
be done first if the vibration occurs at high speeds. Do
an off-vehicle, two-plane dynamic balance first to correct
any imbalance in the tire and wheel assembly.
An on-vehicle finish balance will correct any brake drum,
rotor, or wheel cover imbalance, If balancing does not
correct the high-speed vibration, or if the vibration occurs
at low speeds, runout is the probable cause.
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2B-6 WHEEL ALIGNMENT
MAINTENANCE AND REPAIR
ON VEHICLE SERVICE
WHEEL ALIGNMENT
Vehicle Height
1. Check the tire for proper inflation.
2. Measure ‘A’ from the center of the lower arm rear mounting
bolt end to the ground.
3. Measure ‘B’ from the center of the steering knuckle shaft to
the ground.
4. If the difference between ‘A’ and ‘B’ is not within specification,
adjust vehicle height using torsion bar height control bolt.
‘B’ - ‘A’
Notice
Before wheel alignment, adjust vehicle height first.
31 - 36mm
Toe-in
1. Measure toe-in.
Specification
0 - 4mm
2. If toe-in is not within specification, loosen the tie rod nuts
and adjust it by turning the tie rod.
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WHEEL ALIGNMENT 2B-7
Camber
1. Remove the free wheel hub.
2. Measure camber with a wheel alignment equipment.
3. If camber measurements are not within specification, adjust
it by increasing or decreasing the number of adjusting shims
(1) inserted between the upper arm shaft and cross bracket.
Camber Change
Notice
Difference between the left and right should be adjusted
within 30’.
Specification
0°±30’
Caster
1. Remove the free wheel hub.
2. Measure caster with a wheel alignment equipment and a
turning radius gauge.
Specification
2° 30’ ± 30’
Adjusting Shims
1.6 Iarge
3.2 large
Increasing 1 ea
+ 19’
+ 38’
Decreasing 1 ea
- 19’
- 38’
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2B-8 WHEEL ALIGNMENT
Increasing 1ea
- 11’
- 43’
3. If caster measurements are not within specification, adjust
it by increasing 1ea (rear) or decreasing 1ea (front).
Caster Change
Notice
Difference between the left and right should be adjusted
within 30’.
0.4 small
1.6 small
Decreasing 1ea
+ 11’
+ 43’
FRONT
Adjusting Shims
Increasing 1ea
+ 11’
+ 43’
0.4 small
1.6 small
Decreasing 1ea
- 11’
- 43’
REAR
Adjusting Shims
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