2009 INFINITI QX56 FSU

FSU-4
< PREPARATION >
PREPARATION
PREPARATION
PREPARATION
Special Service ToolINFOID:0000000005889866
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Commercial Service ToolINFOID:0000000003772267
Tool number
(Kent-Moore No.)
Tool name Description
ST29020001
(J-24319-01)
Pitman arm puller Removing upper link ball joint from knuckle
spindle
a: 34 mm (1.34 in)
b: 6.5 mm (0.256 in)
c: 61.5 mm (2.421 in)
HT72520000
(J-25730-A)
Ball joint remover Removing tie-rod outer end
NT694
NT146
Tool name
Description
Attachment wheel alignment Measure wheel alignment
a: Screw M24 x 1.5 pitch
b: 35 mm (1.38 in) dia.
c: 65 mm (2.56 in) dia.
d: 56 mm (2.20 in)
e: 12 mm (0.47 in)
Spring compressor Removing and installing coil spring
Power tool Loosening bolts and nuts
NT148
NT717
PBIC0190E
Revision: December 20092009 QX56

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTINGFSU-5
< SYMPTOM DIAGNOSIS >
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SYMPTOM DIAGNOSIS
NOISE, VIBRATION AND HARSHN ESS (NVH) TROUBLESHOOTING
NVH Troubleshooting ChartINFOID:0000000003772268
Use the chart below to help you find the cause of the symptom. Repair or replace parts as necessary.
x: ApplicableReference page
FSU-13FSU-14FSU-13FSU-13FSU-24FSU-6FSU-6FSU-6
DLN-184, "
NVH Troubleshooting Chart
"
DLN-208, "
NVH Troubleshooting Chart
"
FAX-5, "
NVH Troubleshooting Chart
"
FAX-5, "
NVH Troubleshooting Chart
"
WT-36, "
NVH Troubleshooting Chart
"
WT-36, "
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: December 20092009 QX56

FSU-6
< ON-VEHICLE MAINTENANCE >
ON-VEHICLE SERVICE
ON-VEHICLE MAINTENANCE
ON-VEHICLE SERVICE
Front Suspension PartsINFOID:0000000003772269
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-10, "Inspection".
• 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:0000000003772270
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-40, "
Inspection" .
4. Check the wheel bearing axial end play. Refer to FA X - 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-24, "
Wheelarch Height (Unladen*1)" .
• Verify the level using Consult-III memory register 1103 and set to 0 ± 10 mm (0 ± 0.39 in) as necessary.
GENERAL INFORMATION AND RECOMMENDATIONS
1. A Four-Wheel Thrust Alignment should be performed.
• This type of alignment is recommended 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. Suspension component
torques : Refer to FSU-13,
"Component" . SMA525A
SFA392B
Revision: December 20092009 QX56

ON-VEHICLE SERVICEFSU-7
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2. Make sure the alignment machine is properly calibrated. • Your alignment machine should be regularly calibrated in order to give correct information.
• Check with the manufacturer of your specific a lignment machine for their recommended Service/Cali-
bration Schedule.
THE ALIGNMENT PROCESS
IMPORTANT: Use only the alignment specifications listed in this Service Manual. Refer to FSU-23, "Wheel
Alignment (Unladen*1)" .
1. When displaying the alignment settings, many alignm ent machines use “indicators”: (Green/red, plus or
minus, Go/No Go). Do NOT use these indicators.
• The alignment specifications programmed into your alignment machine that operate these indicators may not be correct.
• This may result in an ERROR.
2. Some newer alignment machines are equipped with an optional “Rolling Compensation” method to “com-
pensate” the sensors (alignment targets or head units). Do NOT use this “Rolling Compensation”
method.
• Use the “Jacking Compensation” method. After installing the alignment targets or head units, raise the vehicle and rotate the wheels 1/2 turn both ways.
• See Instructions in the alignment machine you are using for more information.
CAMBER AND CASTER
1. Measure camber and caster of both the right and left wheels with a suitable alignment gauge and adjust as necessary to
specification.
NOTE:
Some vehicles may be equipped with straight (non-adjustable)
lower link bolts and washers. In order to adjust camber and
caster on these vehicles, first replace the lower link bolts and
washers with adjustable (cam) bolts and washers.
2. If outside of the specified value, adjust camber and caster using the cam bolts (1) in the front lower link (2).
CAUTION:
After adjusting the camber then check the toe-in.
NOTE:
Camber changes about 3' (0.05 °) minutes with each graduation
of one cam bolt. Refer to table below for examples of lower link
cam bolt effect on camber and caster.
3. Tighten the adjusting bolt nuts to specification. Refer to FSU-13, "
Component" .
TOE-IN
WARNING:Camber and
Caster
: Refer to
FSU-23, "
Wheel Alignment
(Unladen*1)" .
SRA096A
WEIA0153E
Rear cam bolt 1 In 1 Out 1 In 1 Out 0 01 In 1 Out
Front cam bolt 1 Out 1 In 1 In 1 Out 1 In 1 Out 0 0
Camber
Degree minute
(Decimal degree) 0 (0) 0 (0) 7' (0.12
°) - 7' (-0.12 °)3' (0.05 °) - 3' (-0.05 °)3' (0.05 °) - 3' (-0.05 °)
Caster
Degree minute
(Decimal degree) - 14' (-0.23
°)14' (0.23 °) 0 (0) 0 (0) 7' (0.12° ) - 7' (-0.12°) - 7' (-0.12 °)7' (0.12 °)
Revision: December 20092009 QX56

FSU-8
< ON-VEHICLE MAINTENANCE >
ON-VEHICLE SERVICE
• Always perform the following procedure on a flat surface.
• Make sure that no person is in front of the vehicle before pushing it.
1. Bounce the front of vehicle up and down to stabilize the vehicle height (posture).
2. Push the vehicle straight ahead about 5 m (16 ft).
3. Put a mark on base line of the tread (rear side) of both front tires at the same height as hub center as shown. These marks are
measuring points.
4. Measure the distance (A) on the rear side of the front tires as shown.
5. Push the vehicle slowly ahead to rotate the wheels 180 °
degrees (1/2 a turn).
CAUTION:
If the wheels have rotated more than 180 ° degrees (1/2
turn), start this procedure again from the beginning. Never
push the vehicle backward.
6. Measure the distance (B) on the front side of the front tires at the
same marks as shown. Total toe- in is calculated as (A) - (B).
7. Adjust the toe-in by varying the length of the steering outer socket.
a. Loosen the outer tie-rod lock nuts.
b. Adjust the toe-in by screwing the outer tie-rods in or out.
c. Tighten the outer tie-rod lock nuts to specification.
FRONT WHEEL TURNING ANGLE
NOTE:
Check front wheel turning angle after the toe-in inspection.
1. Place front wheels on turning radius gauges in straight ahead position and rear wheels on stands so that vehicle can be level.
Check the maximum inner and outer wheel turning angles for LH
and RH road wheels.
2. Start engine and run at idle, turn steering wheel all the way right and left, measure the turning angle.
AFA050
Total toe-in : Refer to FSU-23, "Wheel Alignment (Un-
laden*1)" .
SFA234AC
Standard length (L) : Refer to ST-37, "Steering Outer
Socket and Inner Socket" .
Lock nut : Refer to FA X - 9 , "
Removal and In-
stallation" .
SGIA0167E
Wheel turning angle
(full turn) : Refer to
FSU-23, "Wheel
Alignment (Unladen*1)".
SFA439BA
Revision: December 20092009 QX56

ON-VEHICLE SERVICEFSU-9
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• Any turning angles are not adjustable. If any of steering angles are out of the specification, check if the following parts are worn or damaged.
- Steering gear
- Steering column
- Front suspension components If found that they are worn or damaged, replace them with new ones.
Revision: December 20092009 QX56

FSU-10
< ON-VEHICLE MAINTENANCE >
UPPER BALL JOINT AND LOWER BALL JOINT
UPPER BALL JOINT AND LOWER BALL JOINT
InspectionINFOID:0000000003772271
• Check the ball joint for excessive play. Replace the upper or lower link assembly if any of the followingexists:
- Ball joint stud is worn.
- Ball joint is hard to swing.
- Ball joint play in axial directions or end play is excessive.
Swinging Force
NOTE:
Before checking the axial forces and end play, turn the lower ball joint at least 10 revolutions so that the ball
joint is properly broken in.
1. Measure the ball joint swinging force using a suitable tool.
• Measure at the cotter pin hole for upper ball joint as shown.
• Measure at the groove for lower ball joint as shown.
2. Verify the ball joint swinging force is within specification.
Turning Force
Check the turning torque using a suitable tool.
NOTE:
Before checking the axial forces and end play, turn the lower ball
joint at least 10 revolutions so that the ball joint is properly broken in.
Vertical End Play
Check dust cover for damage. Replace it and the cover clamp if necessary.
NOTE:
WEIA0076E
Swinging force (A)
Upper ball joint : 8.1 - 103.2 N (0.8 - 10.5 kg-f, 1.8 - 23.2 lb-f)
Lower ball joint : 11.4 - 145.5 N (1.1 - 14.8 kg-f, 2.5 - 32.7 lb-f)
SFA858A
Turning torque (B) : 0.5 - 6.4 N·m (0.05 - 0.65 kg-m, 4 - 57 in-lb)
SFA858A
Revision: December 20092009 QX56

UPPER BALL JOINT AND LOWER BALL JOINTFSU-11
< ON-VEHICLE MAINTENANCE >
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Before checking the axial forces and end play, turn the lower ball
joint at least 10 revolutions so that the ball joint is properly broken in. Vertical end play (C) : 0 mm (0 in)
SFA858A
Revision: December 20092009 QX56