Infiniti QX4 (R50). Manual — part 92
Noise, Vibration and Harshness (NVH)
Troubleshooting
NBAX0034
NVH TROUBLESHOOTING CHART
NBAX0034S01
Use the chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
Reference page
—
—
—
AX-4,
18
PD-3
PD-3
Refer
to
DRIVE
SHAFT
in
this
chart.
Refer
to
AXLE
in
this
chart.
Possible cause and
SUSPECTED PARTS
Excessive
joint
angle
Joint
sliding
resistance
Imbalance
Improper
installation,
looseness
Parts
interference
Wheel
bearing
damage
PROPELLER
SHAFT
DIFFERENTIAL
DRIVE
SHAFT
AXLE
SUSPENSION
TIRES
ROAD
WHEEL
BRAKES
STEERING
Symptom
DRIVE SHAFT
Noise, Vibration
×
×
×
×
×
×
×
×
×
×
Shake
×
×
×
×
×
×
×
×
×
AXLE
Noise
×
×
×
×
×
×
×
×
×
×
Shake
×
×
×
×
×
×
×
×
×
Vibration
×
×
×
×
×
×
×
Shimmy
×
×
×
×
×
×
×
Judder
×
×
×
×
×
×
Poor quality ride or
handling
×
×
×
×
×
×
×
: Applicable
SMA525A
On-vehicle Service
FRONT AXLE PARTS
NBAX0004
Check front axle parts for excessive play, cracks, wear and other
damage.
1.
Shake each front wheel to check for excessive play.
2.
Retighten all nuts and bolts to the specified torque.
Tightening torque:
Refer to “Wheel Hub and Rotor Disc”, AX-6.
GI
MA
EM
LC
EC
FE
AT
TF
PD
SU
BR
ST
RS
BT
HA
SC
EL
IDX
FRONT AXLE
Noise, Vibration and Harshness (NVH) Troubleshooting
AX-3
SFA747B
FRONT WHEEL BEARING
NBAX0005
1.
Check that wheel bearings operate smoothly.
2.
Check axial end play.
Axial end play: 0 mm (0 in)
3.
Adjust wheel bearing preload if there is any axial end play or
wheel bearing does not turn smoothly.
Preload Adjustment
NBAX0005S01
Adjust wheel bearing preload after wheel bearing has been
replaced or front axle has been reassembled.
Adjust wheel bearing preload as follows:
1.
Before adjustment, thoroughly clean all parts to prevent dirt
entry.
SFA891-A
2.
Apply multi-purpose grease sparingly to the following parts:
I
Threaded portion of spindle
I
Contact surface between wheel bearing lock washer (cham-
fered side) and outer wheel bearing
I
Grease seal lip
I
Wheel hub (as shown at left)
SFA748B
3.
Tighten wheel bearing lock nut with Tool.
: 78 - 98 N·m (8 - 10 kg-m, 58 - 72 ft-lb)
4.
Turn wheel hub several times in both directions.
5.
Loosen wheel bearing lock nut so that torque becomes 0 N·m
(0 kg-m, 0 ft-lb).
6.
Retighten wheel bearing lock nut with Tool.
: 0.5 - 1.5 N·m (0.05 - 0.15 kg-m, 4.3 - 13.0 in-lb)
SFA747B
7.
Turn wheel hub several times in both directions.
8.
Retighten wheel bearing lock nut with Tool.
: 0.5 - 1.5 N·m (0.05 - 0.15 kg-m, 4.3 - 13.0 in-lb)
9.
Measure wheel bearing axial end play.
Axial end play: 0 mm (0 in)
FRONT AXLE
On-vehicle Service (Cont’d)
AX-4
SMA580A
10. Measure starting force “A” at wheel hub bolt.
SFA830
11. Install lock washer by tightening the lock nut within 15 to 30
degrees.
12. Turn wheel hub several times in both directions to seat wheel
bearing correctly.
13. Measure starting force “B” at wheel hub bolt. Refer to proce-
dure 10.
14. Wheel bearing preload “C” can be calculated as shown below.
C = B − A
Wheel bearing preload “C”:
7.06 - 20.99 N (0.72 - 2.14 kg, 1.59 - 4.72 lb)
15. If wheel bearing preload “C” is outside specifications, remove
lock washer. Tighten or loosen lock nut within
±
15 degrees
(Refer to step 11 above). Install lock washer, then repeat steps
12, 13 and 14.
16. Repeat above procedures until correct axial end play and
wheel bearing preload are obtained.
17. Install drive flange and wheel hub cap.
SFA901
DRIVE SHAFT
NBAX0006
I
Check boot and drive shaft for cracks, wear, damage and
grease leakage.
GI
MA
EM
LC
EC
FE
AT
TF
PD
SU
BR
ST
RS
BT
HA
SC
EL
IDX
FRONT AXLE
On-vehicle Service (Cont’d)
AX-5
Wheel Hub and Rotor Disc
COMPONENTS
NBAX0007
SFA908B
SFA529A
REMOVAL
NBAX0008
CAUTION:
Before removing the front axle assembly, disconnect the ABS
wheel sensor from the assembly. Then move it away from the
front axle assembly area. Failure to do so may result in dam-
age to the sensor wires and the sensor becoming inoperative.
1.
Remove brake caliper assembly.
Brake hose need not be disconnected from brake caliper. In
this case, suspend caliper assembly with wire so as not to
stretch brake hose.
Be careful not to depress brake pedal, or piston will pop out.
Make sure brake hose is not twisted.
FRONT AXLE
Wheel Hub and Rotor Disc
AX-6
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