Lexus SC300 / Lexus SC400. Manual — part 817

4.

CHECK WHEEL BEARING LOOSENESS

(a) Check the backlash in bearing shaft direction.

Maximum: 0.05 mm (0.0020 in.)

(b) Check the axle hub deviation.

Maximum: 0.05 mm (0.0020 in.)

5.

CHECK FRONT SUSPENSION FOR LOOSENESS

6.

CHECK STEERING LINKAGE FOR LOOSENESS

7.

CHECK BALL JOINT FOR EXCESSIVE LOOSENESS

8.

CHECK SHOCK ABSORBER WORK PROPERLY

•

Check for oil leak

•

Check mounting busings for wear

•

Bounce front and rear of the vehicle

SA–4

–

SUSPENSION AND AXLE

GENERAL INSPECTION

WHEEL ALIGNMENT

FRONT WHEEL ALIGNMENT

SA19Z–01

1.

MEASURE VEHICLE HEIGHT
Front vehicle height (SC400):

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Tire size

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Front

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P225/55R16

194.4 mm (7.654 in.)

Front vehicle height (SC300):

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Tire size

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Front

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P215/60R15

190.4 mm (7.496 in.)

Measuring point:
Measure from the ground to the center of the lower suspen-
sion arm front mounting bolt.
NOTICE: Before inspecting the wheel alignment, adjust
the vehicle height to specification.
If the vehicle height is not standard, try to adjust it by pushing
down on or lifting the body.

2. INSTALL

CAMBER–CASTER–KINGPIN

GAUGE

OR

ONTO WHEEL ALIGNMENT TESTER
Follow the specific instructions of the equipment manufactur-
er.

3. INSPECT

CAMBER,

CASTER

AND

STEERING

AXIS

INCLINATION
Specifications:

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Camber

Left–right error

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0

01

’

±

45

’

30

’

or less

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ÑÑÑÑÑÑÑÑÑÑÑÑ

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Caster

Left–right error

2

56

’

±

45

’

30

’

or less

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Steering axis inclination

Left–right error

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8

58

’

±

45

’

30

’

or less

If the steering axis inclination is not as specified, after camber
and caster have correctly adjusted, recheck the steering
knuckle front wheel for bearing or looseness.

4. INSPECT

TOE–IN

Toe–in (total):

A + B

0.1

±

0.2

C–D

1

±

2 mm (0.04

±

0.08 in.)

If toe–in is not within specification adjust by the tie rod end.

–

SUSPENSION AND AXLE

WHEEL ALIGNMENT

SA–5

5.

ADJUST CAMBER AND CASTER
Specifications:

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Camber

Left–right error

ÑÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑ

0

01

’

±

30

’

30

’

or less

ÑÑÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑ

Caster

Left–right error

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ÑÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑ

2

56

’

±

30

’

30

’

or less

(a) Remove the engine under cover.
(b) Loosen the front and/or rear adjusting cam nuts.
(c) Adjust the camber and caster by front and/or rear adjusting

cams.
(See

adjustment chart

)

(d) Torque the front and/or rear adjusting cam nuts.

Torque: 226 N

⋅

m (2,300 kgf

⋅

cm, 166 ft

⋅

lbf)

6.

ADJUST TOE–IN

(a) Remove the boot clamps.
(b) Loosen the tie rod end lock nuts.

(c) Turn the left and right tie rod ends an amount to adjust the

toe–in.

Toe–in (total):

A+B 0.1

±

0.1

C–D 1

±

1 mm (0.04

±

0.04 in.)

HINT: Insure that the lengths of the left and right tie rods are
the same.

Tie rod end length left–right error:

Less than 1.5 mm (0.059 in.)

SA–6

–

SUSPENSION AND AXLE

WHEEL ALIGNMENT

(d) Tighten the tie rod end lock nut.

Torque: 56 N

⋅

m (570 kgf

⋅

cm, 41 ft

⋅

lbf)

(e) Place the boot on the seat and clip it.

HINT: Insure that the boots are not twisted.

7.

INSPECT WHEEL ANGLE
Wheel angle:

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Inside wheel

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37

04

’

(35

04

’

~ 38

04

’

)

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Outside wheel

(reference)

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32

23

’

If wheel angle differ from the standard specifications, check
to see if the lengths of the left and right tie rods are the same.
HINT: If the tie rods lengths are not equal, the wheel angle
can not be adjusted properly.
Reinspect the toe–in after adjusting the tie rods lengths.

–

SUSPENSION AND AXLE

WHEEL ALIGNMENT

SA–7