Infiniti QX4 (R50). Manual — part 555
SBR686C
Precautions
PRECAUTIONS
NBSU0001
I
When installing rubber parts, final tightening must be car-
ried out under unladen condition* with tires on ground.
*Fuel, radiator coolant and engine oil full. Spare tire, jack,
hand tools and mats in designated positions.
I
Use flare nut wrench when removing and installing brake
tubes.
I
After installing removed suspension parts, check wheel
alignment and adjust if necessary.
I
Always torque brake lines when installing.
Preparation
SPECIAL SERVICE TOOLS
NBSU0002
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool name
Description
ST29020001
(J24319-01)
Ball joint remover
NT694
Removing tie-rod outer end and lower ball joint
a: 34 mm (1.34 in)
b: 6.5 mm (0.256 in)
c: 61.5 mm (2.421 in)
COMMERCIAL SERVICE TOOLS
NBSU0003
Tool name
Description
1 Flare nut crowfoot
2 Torque wrench
NT360
Removing and installing each brake piping
a: 10 mm (0.39 in)
Spring compressor
NT717
Removing and installing coil spring
FRONT SUSPENSION
Precautions
SU-2
Noise, Vibration and Harshness (NVH)
Troubleshooting
=NBSU0035
NVH TROUBLESHOOTING CHART
NBSU0035S01
Use the chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
Reference page
SU-4,
16
—
—
—
SU-8,
18
SU-6
—
—
—
—
—
—
Refer
to
SUSPENSION
in
this
chart.
Refer
to
TIRES
in
this
chart.
Refer
to
ROAD
WHEEL
in
this
chart.
BR-6
ST
-6
Possible cause and
SUSPECTED
PARTS
Improper
installation,
looseness
Shock
absorber
deformation,
damage
or
deflection
Bushing
or
mounting
deterioration
Parts
interference
Spring
fatigue
Suspension
looseness
Incorrect
wheel
alignment
Stabilizer
bar
fatigue
Out-of-round
Imbalance
Incorrect
air
pressure
Uneven
tire
wear
Deformation
or
damage
Non-uniformity
Incorrect
tire
size
PROPELLER
SHAFT
DIFFERENTIAL
DRIVE
SHAFT
AXLE
SUSPENSION
TIRES
ROAD
WHEEL
BRAKES
STEERING
Symptom
SUSPENSION
Noise
×
×
×
×
×
×
×
×
×
×
×
×
×
×
Shake
×
×
×
×
×
×
×
×
×
×
×
×
Vibration
×
×
×
×
×
×
×
×
×
×
Shimmy
×
×
×
×
×
×
×
×
×
×
Judder
×
×
×
×
×
×
×
×
Poor quality
ride or han-
dling
×
×
×
×
×
×
×
×
×
×
TIRES
Noise
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
Shake
×
×
×
×
×
×
×
×
×
×
×
×
×
×
Vibration
×
×
×
×
×
×
×
Shimmy
×
×
×
×
×
×
×
×
×
×
×
×
×
Judder
×
×
×
×
×
×
×
×
×
×
×
×
Poor quality
ride or han-
dling
×
×
×
×
×
×
×
×
×
×
ROAD
WHEEL
Noise
×
×
×
×
×
×
×
×
×
×
×
×
Shake
×
×
×
×
×
×
×
×
×
×
×
Shimmy,
Judder
×
×
×
×
×
×
×
×
×
Poor quality
ride or han-
dling
×
×
×
×
×
×
×
×
: Applicable
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
BR
ST
RS
BT
HA
SC
EL
IDX
FRONT SUSPENSION
Noise, Vibration and Harshness (NVH) Troubleshooting
SU-3
Components
NBSU0004
SFA744B
1.
Strut mounting insulator
2.
Spring upper seat
3.
Bound bumper
4.
Coil spring
5.
Strut assembly
6.
Stabilizer connecting rod
7.
Bracket
8.
Stabilizer bar
9.
Transverse link
10. Drive shaft
FRONT SUSPENSION
Components
SU-4
SMA525A
On-vehicle Service
FRONT SUSPENSION PARTS
NBSU0005
Check front axle and front suspension parts for excessive play,
cracks, wear and other damage.
1.
Shake each front wheel to check for excessive play.
2.
Retighten all axle and suspensions nuts and bolts to the speci-
fied torque.
Tightening torque:
Refer to “Components”, SU-8.
SFA392B
3.
Check strut (shock absorber) for oil leakage and other dam-
age.
4.
Check suspension ball joint for grease leakage and ball joint
dust cover for cracks and other damage.
If ball joint dust cover is cracked or damaged, replace ball joint
assembly.
5.
Check suspension ball joint end play.
a.
Jack up front of vehicle and set the stands.
b.
Clamp dial indicator onto transverse link and place indicator tip
on lower edge of brake caliper.
c.
Make sure front wheels are straight and brake pedal is
depressed.
SFA745B
d.
Place a pry bar between transverse link and knuckle.
e.
While raising and releasing pry bar, observe maximum dial
indicator value.
Vertical end play:
0 mm (0 in)
If ball joint vertical end play exists, remove lower ball joint
assembly and recheck the ball joint. Refer to “Tranverse Link
and Lower Ball Joint”, SU-11.
SFA746B
6.
Check spring height from top of wheelarch to ground using the
following procedure.
a.
Park vehicle on a level surface with vehicle unladen*.
*: Fuel, radiator coolant and engine oil full. Spare tire, jack,
hand tools and mats in designated positions.
b.
Check tires for proper inflation and wear (tread wear indicator
must not be showing).
c.
Bounce vehicle up and down several times and measure
dimensions Hf and Hr. Refer to SDS, SU-14.
Spring height is not adjustable. If out of specification, check for
worn springs and suspension parts.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
BR
ST
RS
BT
HA
SC
EL
IDX
FRONT SUSPENSION
On-vehicle Service
SU-5
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