2008 INFINITI QX56 suspension

PRECAUTIONSFSU-3
< PRECAUTION >
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5. When the repair work is completed, return the ignition switch to the ″LOCK ″ position before connecting
the battery cables. (At this time, the steering lock mechanism will engage.)
6. Perform a self-diagnosis check of al l control units using CONSULT-III.
PrecautionINFOID:0000000001534617
• When installing the rubber bushings, the final tightening must be done under unladen condition and with the
tires on level ground. Oil will shorten the life of the rubber bushings, so wipe off any spilled oil immediately.
• Unladen condition means the fuel tank, engine coolant and lubricants are at the full specification. The spare
tire, jack, hand tools, and mats are in their designated positions.
• After installing suspension components, check the wheel alignment.
• Lock nuts are not reusable. Always use new lock nuts for installation. New lock nuts are pre-oiled, do not
apply any additional lubrication.
Revision: March 2010 2008 QX56

FSU-6
< SYMPTOM DIAGNOSIS >
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
SYMPTOM DIAGNOSIS
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
NVH Troubleshooting ChartINFOID:0000000001534620
Use the chart below to help you find the cause of t he symptom. Repair or replace parts as necessary.
x: ApplicableReference page
FSU-14FSU-15FSU-14FSU-14FSU-25FSU-7FSU-7FSU-7
DLN-182, "
NVH Troubleshooting Chart
"
DLN-206, "
NVH Troubleshooting Chart
"
FAX-5, "
NVH Troubleshooting Chart
"
FAX-5, "
NVH Troubleshooting Chart
"
WT-41, "
NVH Troubleshooting Chart
"
WT-41, "
NVH Troubleshooting Chart
"
BR-6, "
NVH Troubleshooting Chart
"
ST-12, "
NVH Troubleshooting Chart
"
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
PROPELLER SHAFT
FRONT FINAL DRIVE
DRIVE SHAFT
WHEEL HUB
TIRES
ROAD WHEEL
BRAKES
STEERING
Symptom
Noise
× × ×××× × × ×× × × ××
Shake × × ×× × × ×× × × ××
Vibration × × ××× × ×× × ×
Shimmy × × ×× × × × × ××
Shudder ××× ×××××
Poor quality ride or handling ××××× ×× ×××
Revision: March 2010 2008 QX56

ON-VEHICLE SERVICEFSU-7
< ON-VEHICLE MAINTENANCE >
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ON-VEHICLE MAINTENANCE
ON-VEHICLE SERVICE
Front Suspension PartsINFOID:0000000001534627
Check front suspension parts for excessive play, cracks, wear and
other damage.
• Shake each front wheel to check for excessive play. If looseness is noted, inspect wheel bearing end play, then check
ball joint end play. Refer to FA X - 6 , "
On-Vehicle Inspection and Ser-
vice" and FSU-7, "Front Suspension Parts".
• Make sure that the cotter pin is inserted (4WD only).
• Retighten all nuts and bolts to the specified torque.
• Check shock absorber for oil leakage and other damage.
• Check suspension ball joint for grease leakage and ball joint dust cover for cracks and other damage.
Front Wheel AlignmentINFOID:0000000004915023
PRELIMINARY INSPECTION
WARNING:
Always adjust the alignment with the vehicle on a flat surface.
NOTE:
If alignment is out of specificat ion, inspect and replace any damaged or worn suspension parts before making
any adjustments.
1. Check and adjust the wheel alignment with the vehicle under unladen conditions. “Unladen conditions”
means that the fuel, coolant, and lubricant are full; and that the spare tire, jack, hand tools and mats are in
their designated positions.
2. Check the tires for incorrect air pressure and excessive wear.
3. Check the wheels for run out and damage. Refer to WT-45, "
Inspection".
4. Check the wheel bearing axial end play. Refer to FAX-6, "
On-Vehicle Inspection and Service" .
5. Check the shock absorbers for leaks or damage.
6. Check each mounting point of the suspension components for any excessive looseness or damage.
7. Check each link, arm, and the rear suspension member for any damage.
8. Check the vehicle height. Refer to FSU-25, "
Wheelarch Height (Unladen*1)" .
GENERAL INFORMATION AND RECOMMENDATIONS
1. A Four-Wheel Thrust Alignment should be performed.
• This type of alignment is re commended for any NISSAN vehicle.
• The four-wheel “thrust” process helps ensure that the vehicle is properly aligned and the steering wheel
is centered.
• The alignment machine itself should be ca pable of accepting any NISSAN vehicle.
• The alignment machine should be checked to ensure that it is level.
2. Make sure the alignment machine is properly calibrated. Suspension component torques : Refer to
FSU-14,
"Component" . SMA525A
SFA392B
Revision: March 2010 2008 QX56

FSU-10
< ON-VEHICLE MAINTENANCE >
ON-VEHICLE SERVICE
- Steering gear
- Steering column
- Front suspension componentsIf found that they are worn or damaged, replace them with new ones.
Revision: March 2010 2008 QX56

FSU-14
< ON-VEHICLE REPAIR >
FRONT SUSPENSION ASSEMBLY
ON-VEHICLE REPAIR
FRONT SUSPENSION ASSEMBLY
ComponentINFOID:0000000001534626
1. Dust cover2. Shock absorber 3. Upper link
4. Steering knuckle 5. Cotter pin 6. bolt
7. Jounce bumper 8. washer 9. Lower link
10. Stabilizer bar 11. Stabilizer bar bushing 12. Stabilizer bar mounting bracket
13. Connecting rod 14. Coil spring 15. Upper seat
16. Upper spring seat 17. Shock absorber bushing 18. Shock absorber mounting insulator
19. Spacer 20. Washer ⇐Front
AWEIA0142GB
Revision: March 2010 2008 QX56

FSU-24
< SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
General SpecificationINFOID:0000000001534621
Spring Free HeightINFOID:0000000001534622
Wheel Alignment (Unladen*1)INFOID:0000000001534623
*1: Fuel, radiator coolant and engine oil full. Spare tire, jack, hand tools and mats in designated positions.Suspension type
Independent double wishbone coil over shock
Shock absorber type Double-acting hydraulic
Stabilizer Standard equipment
2WD325.5 ± 3 mm (12.8 ± 0.1 in)
4WD 335.0 ± 3 mm (13.2 ± 0.1 in)
Drive type 2WD 4WD
Camber *6
Degree minute (decimal degree) Minimum
-0° 51 ′ (-0.85 °)- 0° 33 ′ (-0.55 °)
Nominal -0° 6 ′ (-0.10 °)0 ° 12 ′ (0.20 °)
Maximum 0° 39 ′ (0.65 °)0 ° 57 ′ (0.95 °)
Cross camber 0° 45 ′ (0.75 °) or less 0 ° 45 ′ (0.75 °) or less
Caster *6
Degree minute (decimal degree) Minimum
3° 15 ′ (3.25 °)2 °45 ′ (2.75 °)
Nominal 4° 0 ′ (4.00 °)3 ° 30 ′ (3.50 °)
Maximum 4° 45 ′ (4.75 °)4 ° 15 ′ (4.25 °)
Cross caster 0° 45 ′ (0.75 °) or less 0
° 45 ′ (0.7
5°) or less
Kingpin inclination
Degree minute (decimal degree) 13
° 32 ′ (13.53 °)1 3°13 ′ (13.22 °)
To t a l t o e - i n Distance (A
− B) Minimum
1.8 mm (0.07 in) 1.8 mm (0.07 in)
Nominal 2.8 mm (0.11 in) 2.8 mm (0.11 in)
Maximum 3.8 mm (0.15 in) 3.8 mm (0.15 in)
Angle (left side or right side)
Degree minute (decimal degree) Minimum
0° 3 ′ (0.05 °)0 ° 3 ′ (0.05 °)
Nominal 0° 5 ′ (0.08 °)0 ° 5 ′ (0.08 °)
Maximum 0° 7 ′ (0.12 °)0 ° 7 ′ (0.12 °)
Wheel turning angle
(full turn) Inside
Degree minute (decimal degree)
34
° 31 ′ – 38 ° 31 ′ *2
(34.52 ° – 38.52 °) 34
° 44 ′ – 38° 44′ *4
(34.73 ° – 38.73 °)
Outs id

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Degree minute (decimal degree) 30
° 59 ′ – 34 ° 59 ′ *3
(30.98 ° – 34.98 °) 30
° 29 ′ – 34° 29′ *5
(30.48 ° – 34.48 °)
SFA234AC
Revision: March 2010 2008 QX56

SERVICE DATA AND SPECIFICATIONS (SDS)FSU-25
< SERVICE DATA AND SPECIFICATIONS (SDS)
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*2: Target value 37 ° 31 ′ (37.52 °)
*3: Target value 33 ° 59 ′ (33.98 °)
*4: Target value 37 ° 44 ′ (37.73 °)
*5: Target value 33 ° 29 ′ (33.48 °)
*6: Some vehicles may be equipped with straight (non-adjustable) lower link bolts and washers. In order to adjust camber and ca ster on
these vehicles, first replace the lower link bolts and washers with adjustable (cam) bolts and washers.
Ball JointINFOID:0000000001534624
*1 Measure at cotter pin hole
*2 Measure at groove
Wheelarch Height (Unladen*1)INFOID:0000000004894315
Unit: mm (in)
*1: Fuel, radiator coolant and engine oil full. Spare tire, jack, hand tools and mats in designated positions.
*2: Verify the vehicle height. If vehicle height is not within ± 10 mm (0.39 in) of the specification, perform the control unit initialization pro-
cedure. Refer to SCS-7, "
CONSULT-III Function".
Swinging force “A”
Upper ball joint 8.1 – 103.2 N (0.8 – 10.5 kg-f, 1.8 – 23.2 lb-f) *1
Lower ball joint 11.4 – 145.5 N (1.1 – 14.8 kg-f, 2.5 – 32.7 lb-f) *2
Turning torque “B” 0.5 - 6.4 N·m (0.05 - 0.65 kg-m, 4 - 57 in-lb)
Vertical end play “C” 0 mm (0 in)
SFA858AWEIA0076E
Suspension type
Air leveling*2
Applied model2WD4WD
Front wheelarch height (Hf) 920
(36.22) 937
(36.89)
Rear wheelarch height (Hr) 917
(36.10) 937
(36.89)
LEIA0085E
Revision: March 2010 2008 QX56

TOW TRUCK TOWINGGI-33
< PRECAUTION >
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Never tow the vehicle using only the towing points. To avoid
damaging the vehicle body, use propeer towing equipment
when towing.
Vehicle Recovery (Freeing a stuck vehicle)INFOID:0000000004900864
• Tow chains or cables must be attached only to the main structural members of the vehicle.
• Pulling devices should be routed so they do not touch any part of the suspension, steering, brake or
cooling systems
• Always pull the cable straight out from the front or rear of the vehicle. Never pull the vehicle at a
sideways angle.
• Pulling devices such as ropes or canvas straps are not recommended for use for vehicle towing or
recovery.
WAIA0055E
Revision: March 2010 2008 QX56