suspension INFINITI QX56 2008 Factory Workshop Manual

REAR SUSPENSION MEMBERRSU-11
< REMOVAL AND INSTALLATION >
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REMOVAL AND INSTALLATION
REAR SUSPENSION MEMBER
Removal and InstallationINFOID:0000000004900757
Rear Suspension
AWEIA0164GB
Revision: March 2010 2008 QX56

RSU-12
< REMOVAL AND INSTALLATION >
REAR SUSPENSION MEMBER
Rear Load Leveling Air Suspension System
REMOVAL
1. Use the CONSULT-III “EXHAUST SOLENOID” active test to release the air pressure from the rear load
leveling air suspension system.
2. Disconnect the electrical connectors for the height sensor and the rear load leveling air suspension com-
pressor assembly.
3. Unclip the rubber cover to access the rear load leveling air suspension compressor assembly.
1. Seat belt latch anchor 2. Stabilizer bar bushing3. Stabilizer bar clamp
4. Stabilizer bar 5. Connecting rod 6. Front lower link
7. Knuckle 8. Bushing9. Rear lower link
10. Shock absorber 11. Suspension arm12. Lower rubber seat
13. Coil spring 14. Upper rubber seat15. Rear suspension member
16. Spare tire bracket 17. Bound bumper Front
AWEIA0054GB
1. Rear load leveling air suspension
hose, RH 2. Shock absorber, RH
3. Height sensor
4. Rear load leveling air suspension hose, LH 5. Shock absorber, LH
6. Rear load leveling air suspension
compressor assembly (includes the
bracket and rubber cover)
Front
Revision: March 2010 2008 QX56

REAR SUSPENSION MEMBERRSU-13
< REMOVAL AND INSTALLATION >
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4. Disconnect the rear load leveling air suspension hoses at the rear load leveling air suspension compressor assembly.
• To disconnect the hoses, push in on the lock ring using a suit-able tool and pull the hose out.
5. Remove both of the rear wheel and tire assemblies using power tool.
6. Remove the brake caliper without disconnecting the brake hoses, using power tool. Reposition the brake caliper out of the
way using a suitable wire. Refer to BR-36, "
Removal and Instal-
lation of Brake Caliper and Disc Rotor" .
CAUTION:
• Do not crimp or stretch the brake hose when reposition- ing the brake caliper out of the way.
• Do not press brake pedal while the brake caliper is removed.
7. Remove the spare tire.
8. Remove both lower shock bolts.
9. Disconnect the two rear ABS sensor electrical connectors.
10. Remove the two rear drive shafts. Refer to RAX-10, "
Removal and Installation" .
11. Remove the rear final drive. Refer to DLN-248, "
Removal and Installation" .
12. Remove the EVAP canister bolt from the top of the rear suspension member.
13. Disconnect the parking brake cables from the brackets on the rear suspension member.
14. Disconnect parking brake cables at equalizer. Refer to PB-7, "
Removal and Installation"
15. Set a suitable jack to support each of the rear lower links and the
coil spring tension.
16. Remove both of the rear lower link outer bolts and lower the jack to remove the rear coil springs.
17. Remove the two bolts to disconnect the seat belt latch anchor from the rear suspension member.
18. Disconnect both of the connecting r ods from the front lower link.
19. Set a suitable jack under the rear suspension member.
20. Remove the six rear suspension member bolts.
21. Slowly lower the jack to remove the rear suspension member, suspension arm, front and rear lower links and stabilizer bar as
an assembly.
22. If necessary, remove the suspension arm, spare tire bracket, height sensor, rear load leveling air suspension hoses, stabilizer
bar, knuckle, and front and rear lower links from the rear sus-
pension member.
INSPECTION AFTER REMOVAL
Check the rear suspension member for deformation, cracks, and other damage and replace if necessary.
INSTALLATION
Installation is in the reverse order of removal.
LEIA0074E
LEIA0077E
LEIA0075E
Revision: March 2010 2008 QX56

RSU-14
< REMOVAL AND INSTALLATION >
REAR SUSPENSION MEMBER
• When raising the rear suspension member assembly, use thelocating pins to align the rear suspension member to the vehicle
body.
• When installing the upper and lower rubber seats for the rear coil springs, the arrow embossed on the rubber seats must point out
toward the wheel and tire assembly.
• To connect the rear load leveling air suspension hoses, the lock ring must be fully seated in the fitt ing. Insert the hose “B” into the
lock ring “A” until the lock ring “A” is touching the hose “B” as
shown. Pull on the hose to check that it is securely inserted.
• Perform the final tightening of the nuts and bolts for the links (rubber bushing) under unladen condition (unladen condition means that the fuel tank, engine cool ant and lubricants are at the full specification, and
the spare tire, jack, hand tools, and mats are in t heir designated positions) with the tires on level ground.
• Check the wheel alignment. Refer to RSU-6, "
Wheel Alignment Inspection" .
LEIA0083E
LEIA0076E
LEIA0078E
Revision: March 2010 2008 QX56

SHOCK ABSORBERRSU-15
< REMOVAL AND INSTALLATION >
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SHOCK ABSORBER
Removal and InstallationINFOID:0000000004900758
REMOVAL
1. Remove the wheel and tire assembly using power tool. Refer to WT-48, "Rotation".
2. Use CONSULT-III “EXHAUST SOLENOID ” active test to release the air pressure from the rear load level-
ing air suspension system.
3. Remove the four clips and remove the rear fender protector, front.
4. Disconnect the rear load leveling air suspension hose from the shock absorber.
• To disconnect the hose, push in on the lock ring using a suit-
able tool and pull the air hose out.
5. Remove the shock absorber upper and lower end bolts using power tool.
6. Remove the shock absorber. CAUTION:
Do not damage the rubber boot on the shock absorber.
INSTALLATION
Installation is in the reverse order of removal.
• Tighten the shock absorber bolts to specification. Refer to RSU-9, "
Component".
INSPECTION AFTER INSTALLATION
• Check the shock absorber for any air leaks or damage to the rubber boot.
• Check the shock absorber for smooth operation through a full stroke, both compression and extension.
• Check piston rod for cracks, deformation or other damage and replace if necessary.
LEIA0081E
LEIA0082E
Revision: March 2010 2008 QX56

RSU-16
< REMOVAL AND INSTALLATION >
SUSPENSION ARM
SUSPENSION ARM
Removal and InstallationINFOID:0000000004900759
REMOVAL
1. Remove the rear suspension member assembly using power tool. Refer to RSU-11, "Removal and Instal-
lation" .
NOTE:
It is necessary to remove the rear suspension member to remove the front upper bolt from the suspension
arm.
2. Remove the shock absorber upper end bolt.
3. Remove the suspension arm upper nuts and bolts on the sus- pension member side using power tool.
4. Remove the suspension arm pinch bolt and nut on the knuckle side using power tool.
5. Disconnect the suspension arm from the knuckle using a soft hammer.
CAUTION:
Do not damage the ball joint with the soft hammer.
6. Remove the suspension arm.
INSPECTION AFTER REMOVAL
• Check the suspension arm for damage, cracks, deformation and replace if necessary.
• Check the rubber bushing for damage, cracks and deformation. Replace suspension arm assembly if neces- sary.
• Before checking, turn the ball joint at least 10 revolutions so that the ball joint is properly broken in.
LEIA0082E
LEIA0087E
Revision: March 2010 2008 QX56

SUSPENSION ARMRSU-17
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• Check the ball joint. Replace the suspension arm assembly if any of the following conditions exist:
- Ball stud is worn.
- Joint is hard to swing.
- Play in axial direction is excessive.
INSTALLATION
Installation is in the reverse order of removal.
• Tighten the nuts and bolts to specification. Refer to RSU-9, "
Component" .
• Perform the final tightening of the nuts and bolts for the links (rubber bushing) under unladen condition
(unladen condition means that the fuel tank, engine cool ant and lubricants are at the full specification, and
the spare tire, jack, hand tools, and mats are in t heir designated positions) with the tires on level ground.
• Check the wheel alignment. Refer to RSU-6, "
Wheel Alignment Inspection" .
Swinging force “A” : Refer to RSU-28, "
Ball Joint" .
Turning force “B” : Refer to RSU-28, "
Ball Joint" .
Vertical end play “C” : Refer to RSU-28, "
Ball Joint" .
SFA858A
Revision: March 2010 2008 QX56

RSU-18
< REMOVAL AND INSTALLATION >
FRONT LOWER LINK
FRONT LOWER LINK
Removal and InstallationINFOID:0000000004900760
REMOVAL
1. Remove the wheel and tire assembly using power tool.
2. Use CONSULT-III "EXHAUST SOLENOID" active test to release the air pressure from the rear load level-
ing air suspension system.
3. Remove the shock absorber lower end bolt.
4. Remove stabilizer bar connecting rod from front lower link.
5. Remove stabilizer bar clamps and place bar aside.
6. Remove the adjusting bolt and nut, and the bolt and nut, from the front lower link and rear suspension member using power
tool.
7. Remove the front lower link pinch bolt and nut on the knuckle side using power tool.
8. Disconnect the front lower link from the knuckle using a soft hammer.
CAUTION:
Do not damage the ball joint with the soft hammer.
9. Remove the front lower link.
INSPECTION AFTER REMOVAL
• Check the front lower link and bushing for any deformation, crack, or damage. Replace if necessary.
• Check the rubber bushing for damage, cracks and deforma tion. Replace the front lower link and bushing if
necessary.
• Before checking, turn the ball joint at least 10 revolutions so that the ball joint is properly broken in.
LEIA0082E
LEIA0086E
Revision: March 2010 2008 QX56

RSU-20
< REMOVAL AND INSTALLATION >
REAR LOWER LINK & COIL SPRING
REAR LOWER LINK & COIL SPRING
Removal and InstallationINFOID:0000000004900761
REMOVAL
1. Remove the wheel and tire assembly using power tool. Refer to WT-48, "Rotation" .
2. Use CONSULT-III "EXHAUST SOLENOID" active test to release the air pressure from the rear load level-
ing air suspension system.
3. For removing the LH rear lower link and coil spring, remove the height sensor arm bracket bolt from the LH rear lower link.
4. Remove speed sensor harness and brackets from rear lower link.
5. Set a suitable jack to relieve the coil spring tension from the rear lower link.
WARNING:
Do not compress the coil sp ring when setting the jack.
6. Loosen the rear lower link adjusting bolt and nut connected to the rear suspension member, using power tool.
7. Remove the rear lower link bolt and nut from the knuckle using power tool.
LEIA0080E
LEIA0077E
LEIA0009E
LEIA0077E
Revision: March 2010 2008 QX56

REAR LOWER LINK & COIL SPRINGRSU-21
< REMOVAL AND INSTALLATION >
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8. Slowly lower the suitable jack to release the coil spring tension. Then remove the upper rubber seat, coil spring, and lower rubber seat from the rear lower link.
9. Remove the rear lower link adjusting bolt and nut from the rear suspension member using power tool, then remove the rear
lower link.
INSPECTION AFTER REMOVAL
Check the coil spring and rubber seats for deformation, cracks, or other damage and replace if necessary.
INSTALLATION
Installation is in the reverse order of removal.
• Tighten the nuts and bolts to specification. Refer to RSU-9, "
Component" .
• When installing the upper and lower rubber seats for the rear coil springs, the arrow embossed on the rubber seats must point out
toward the wheel and tire assembly.
• After installing the rear lower link and coil spring, check the wheel alignment and adjust if necessary. Refer to RSU-6, "
Wheel Align-
ment Inspection"
LEIA0009E
LEIA0076E
Revision: March 2010 2008 QX56