lock NISSAN 350Z 2007 Z33 Power Steering System Workshop Manual

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
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Revision: 2006 November2007 350Z
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTINGPFP:00003
NVH Troubleshooting ChartNGS00006
Use chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
×: ApplicableReference page
PS-6PS-6PS-21PS-21PS-21PS-6PS-7PS-21EM-12PS-7PS-15PS-17PS-10PS-10PS-17
NVH in PR section
NVH in RFD section
NVH in FAX, RAX, FSU, RSU section
NVH in WT section
NVH in WT section
NVH in RAX section
NVH in BR section
Possible cause and suspected parts
Fluid level
Air in hydraulic system
Outer socket ball joint swinging force
Outer socket ball joint sliding torque
Outer socket ball joint end play
Steering fluid leakage
Steering wheel play
Steering gear rack sliding force
Drive belt looseness
Improper steering wheel
Improper installation or looseness of tilt lock lever
Mounting rubber deterioration
Steering column deformation or damage
Improper installation or looseness of steering column
Steering linkage looseness
PROPELLER SHAFT
DIFFERENTIAL
AXLE and SUSPENSION
TIRES
ROAD WHEEL
DRIVE SHAFT
BRAKES
SymptomNoise× × ××××× × × ×××××× ×
Shake××× × ×××× ×
Vibration××××× × ×× ×
Shimmy××× × ××× ×
Judder××××××

PS-6
POWER STEERING FLUID
Revision: 2006 November2007 350Z
POWER STEERING FLUIDPFP:KLF20
Checking Fluid LevelNGS00007

Stop engine before performing a fluid level check.

Ensure that fluid level is between the MAX range and MIN level.

Because fluid level differs within the HOT range and the COLD
range, check it carefully.
CAUTION:

Do not overfill the MAX level.

Do not reuse any used power steering fluid.
Checking Fluid LeakageNGS00008
Check that hydraulic piping lines for improper attachment and for
leaks, cracks, damage, loose connections, chafing or deterioration.
1. Run engine until fluid temperature reaches 50 to 80° C (122 to
176°F) in reservoir tank. Keep engine speed idle.
2. Turn steering wheel right-to-left several times.
3. Hold steering wheel at each “lock” position for five seconds to
check fluid leakage.
CAUTION:
Do not hold steering wheel in a locked position for more
than 10 seconds. (There is the possibility that oil pump may
be damaged.)
4. If fluid leakage at connections is noticed, then loosen flare nut and then retighten. Do not over tighten con-
nector as this can damage O-ring, washer and connector.
5. If fluid leakage at the connectors is noticed, then loosen the flare nut and retighten it.
6. Check steering gear boots for accumulation of fluid indicating a from steering gear.
Air Bleeding Hydraulic SystemNGS00009
Incomplete air bleeding causes the following. When this happens, bleed air again.

Generation of air bubbles in reservoir tank

Generation of clicking noise in oil pump

Excessive buzzing in oil pump
NOTE:
When vehicle is stationary or while steering wheel is being turned slowly, some noise may be heard from
oil pump or gear. This noise is normal and does not affect any system.
1. Stop engine, and then turn steering wheel fully to right and left several times.
CAUTION:
Do not allow steering fluid reservoir tank to go below the low-level line. Check tank frequenter and
add fluid as needed.
2. Run engine at idle speed. Turn steering wheel fully to the right and then fully to the left, and keep for about
three seconds. Then check whether a fluid leakage has occurred.
3. Repeat the 2nd procedure several times at about three seconds intervals.
CAUTION:
Do not hold steering wheel in the locked position more than 10 seconds. (There is the possibility
that oil pump may be damaged.)
4. Check generation of air bubbles and cloud in fluid.
5. If air bubbles and the cloud don't fade, stop engine, hold air bleeding until air bubbles and the cloud fade.
Perform the 2nd and the 3rd procedures again.
6. Stop engine, check fluid level.HOT : Fluid temperatures from 50 to 80 °C (122 to
176°F)
COLD : Fluid temperatures from 0 to 30°C (32 to 86°F)
SGIA0232J
SST836C

STEERING WHEEL
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Revision: 2006 November2007 350Z
STEERING WHEELPFP:48430
On-Vehicle Inspection and ServiceNGS0000A
CHECKING CONDITION OF INSTALLATION

Check installation condition of steering gear assembly, front sus-
pension, axle and steering column.

Check if movement exists when steering wheel is moved up and
down, to the left and right and to the axial direction.

Check if the mounting bolts for steering gear assembly are loose
or not. Refer to PS-17, "
POWER STEERING GEAR AND LINK-
AGE" .
CHECKING STEERING WHEEL PLAY
1. Set tires to the straight ahead, start engine, then turn steering wheel to the left and right lightly, and mea-
sure steering wheel movement on the outer circumference when steering wheel is turned up to the point
where tires start moving.
CHECKING NEUTRAL POSITION ON STEERING WHEEL

Check neutral position on steering wheel after confirming that front wheel alignment is correct. Refer to
PS-35, "
SERVICE DATA AND SPECIFICATIONS (SDS)" .
1. Set the vehicle to the straight ahead-direction, check if steering wheel is in the neutral position.
2. If it is not in the neutral position, remove steering wheel and reinstall it correctly.
3. If the neutral position cannot adjust in the two teeth of steering gear assembly, loosen tie-rod lock nuts of
steering outer sockets, then adjust tie-rods by the same amount in the opposite direction.
CHECKING STEERING WHEEL TURNING FORCE
1. Park vehicle on a level and dry surface, set parking brake.
2. Start engine.
3. Bring power steering fluid up to adequate operating temperature. [Make sure temperature of fluid is
approximately 50 to 80°C (122 to 176°F).]
4. Check steering wheel turning force when steering wheel has
been turned 540° from neutral position.
NOTE:
Multiply the distance (L) from the hook of spring scale to the
center of steering wheel by the measurement value with a spring
scale.
5. If steering wheel turning force is out of the specification, check
rack sliding force and relief hydraulic pressure of oil pump.
Regarding relief hydraulic pressure of oil pump, refer to PS-28,
"CHECKING RELIEF OIL PRESSURE" .
a. Disconnect lower joint and steering knuckle from steering gear assembly. Refer to PS-17, "
Removal and
Installation" , FA X - 4 , "Removal and Installation" .
b. Start and run engine at idle to make sure steering fluid has reached normal operating temperature.End play of the axle direction for steering wheel:
0 mm (0 in)
SGIA0348E
Steering wheel play on the outer circumference : 0 - 35 mm (0 - 1.38 in)
Steering wheel turning
force: 7.45 N·m (0.76 kg-m, 66 in-lb)
SGIA1136E

STEERING WHEEL
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Revision: 2006 November2007 350Z
Removal and InstallationNGS0000B
REMOVAL
NOTE:
When reconnecting spiral cable, fix cable with a tape so that fixing case and rotating part keep aligned. This
will omit neutral position alignment procedure during spiral cable installation.
1. Set vehicle to the straight-ahead position.
2. Remove driver air bag module. Refer to SRS-40, "
Removal and Installation" .
3. Remove steering wheel lock nut after steering is locked.
4. Remove steering wheel with the steering wheel puller A.
INSTALLATION
Installation is the reverse order of removal. For tightening torque, refer to PS-10, "Removal and Installation" .
NOTE:
Check the spiral cable neutral position after replacing or rotating spiral cable. Refer to SRS-42, "
Removal and
Installation" . Tool number A: ST27180001 (J-25726-A)
SGIA1323E

PS-10
STEERING COLUMN
Revision: 2006 November2007 350Z
STEERING COLUMNPFP:48810
Removal and InstallationNGS0000C
COMPONENTS
CAUTION:

Care must be taken not to give axial impact to steering column assembly during removal and
installation.

Care must be taken not to move steering gear during removal of steering column assembly.
REMOVAL
1. Set vehicle to the straight ahead-direction.
2. Remove driver air bag module from steering wheel. Refer to SRS-40, "
DRIVER AIR BAG MODULE" .
3. Disconnect steering switch connector, remove steering wheel lock nut, then remove steering wheel. Refer
to PS-7, "
STEERING WHEEL" .
4. Remove dash side finisher (LH). Refer to IP-10, "
INSTRUMENT PANEL ASSEMBLY" .
5. Remove instrument driver panel lower. Refer to IP-10, "
INSTRUMENT PANEL ASSEMBLY" .
6. Remove column lower cover and combination meter (which is connected with steering column upper
cover) from steering column assembly. Refer to DI-24, "
Removal and Installation for Combination Meter" .
1. Lower joint 2. Lower shaft 3. Hole cover
4. Clamp 5. Hole cover seal 6. Collar
7. Steering column assembly 8. Combination switch & spiral cable 9. Escutcheon
10. Column lower cover 11. Right lid 12. Combination meter & column upper cover
13. Steering wheel 14. Steering wheel lock nut 15. Left lid
16. Driver air bag module
SGIA0339E

STEERING COLUMN
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Revision: 2006 November2007 350Z
7. Remove combination switch & spiral cable from steering column
assembly. Refer to SRS-42, "
Removal and Installation" .
8. Disconnect the following connector from steering column
assembly.

Steering lock harness connector

Ignition switch harness connector

Key switch harness connector
9. Remove control unit with VDC/TCS/ABS control unit. Refer to
BRC-129, "
VDC/TCS/ABS CONTROL UNIT" .
10. Disconnect brake switch harness connector.
11. Remove steering column shaft from lower shaft in the following
procedure.
a. Remove lock nut from yoke.
b. Turn steering wheel to the right to appear the head of bolt.
c. Remove the fixed part of collar for bolt to the outside of its head,
remove bolt.
d. Remove the set lib of steering column assembly side from yoke,
push it equal to the thick part of yoke.
NOTE:
Because collar is set in lower shaft, if the set lib is pushed
(action), joint center will be lifted in the opposite direction (reac-
tion), and then the set lib will be in squeezed to the thick part of
yoke.
SGIA0368E
SGIA0724E
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SGIA0354E

STEERING COLUMN
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Revision: 2006 November2007 350Z
Disassembly and AssemblyNGS0000D
COMPONENTS
DISASSEMBLY
1. Remove steering column shaft lock nut, then remove steering column shaft from front side of jacket tube.
2. Remove tilt device from jacket tube.
3. Remove lock nut and adjusting stopper according to the following procedure.
a. Turn tilt lever to the unlock side.
b. Remove spring from column mounting bracket.
1. Steering column shaft 2. Adjusting bolt 3. Adjusting stopper
4. Jacket tube 5. Steering column shaft lock nut 6. Spring
7. Column mounting bracket 8. Tilt lever stopper 9. Tilt lever
10. Lock nut
SGIA0340E
SGIA0742E

PS-16
STEERING COLUMN
Revision: 2006 November2007 350Z
c. Lock adjusting bolt, then remove lock nut.
d. Remove adjusting bolt, adjusting stopper, column mounting
bracket, tilt lever stopper and tilt lever from jacket tube.
INSPECTION AFTER DISASSEMBLY

Check if there is something wrong with steering column shaft and bearing. And then if they are damaged,
replace with new one.

Check if there is something wrong with the component of tilt device. And then if it is damaged, replace
with new one.
ASSEMBLY
1. Install tilt device to jacket tube. Refer to PS-15, "Disassembly and Assembly" .
NOTE:

Turn tilt lever to unlock side while at work to make it easier.

That can avoid column shaft's sudden descent when tilt lever
is operated on vehicle.
2. When tilt lever is in the locked position (operation range is about
40°), tighten lock nut at the specified torque to make tilt lever
locked.
3. Apply grease to the part shown in the figure of component. Refer
to PS-15, "
Disassembly and Assembly" .
4. Install steering column shaft to jacket tube, tighten steering col-
umn shaft lock nut at the specified torque.
SGIA0343E
SGIA0344E
SGIA0346E
Tightening torque:
13.5 - 18.6 N·m (1.4 - 1.8 kg-m, 10 - 13 ft-lb)
Tightening torque : 25 - 34 N·m (2.6 - 3.4 kg-m, 19 - 25 ft-lb)
SGIA0347E

PS-20
POWER STEERING GEAR
Revision: 2006 November2007 350Z
CAUTION:

Secure steering gear assembly with a vise, using copper
plates or something similar to prevent it from being dam-
aged. Do not grip cylinder with a vise.

Before performing disassembly, clean steering gear assem-
bly with kerosene. Be careful not to bring any kerosene into
contact with the discharge and return port connectors.
DISASSEMBLY
1. Remove cylinder tubes from gear housing assembly.
2. Remove rear cover cap from gear-sub assembly.
3. Measure adjusting screw height from gear housing assembly,
then loosen adjusting screw.
CAUTION:

Do not turn adjusting screw more than twice.

Replace steering gear assembly when adjusting screw is
removed or more than twice.
4. Remove fixing bolts of gear-sub assembly, and then remove
gear-sub assembly from gear housing assembly.
5. Remove O-ring B from gear housing assembly.
6. Loosen lock nut of outer socket, and remove outer socket.
7. Remove boot clamps of the small diameter side and the large
diameter side, then remove boots.
CAUTION:
On removing boots, be careful not to damage the inner socket and the gear housing assembly. If
they are is damaged, change them to avoid oil leaks.
8. Drill out the clinching part of cylinder outer rim with a 3 mm (0.12
in) drill in 1.5 mm (0.059 in) depth.
9. Remove end cover assembly with a 42 mm (1.65 in) open head
(suitable tool).
CAUTION:
Be careful not to damage rack. If it is damaged, replace
rack. Otherwise, oil leaks may result.
10. Pull rack with rack oil seal out of gear housing assembly.
CAUTION:
Be careful not to damage cylinder. If it is damaged, replace
gear housing assembly. Otherwise, oil leaks may result.
:Apply multi-purpose grease.
:Apply Genuine NISSAN PSF or equivalent.
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STC0013D
SST081B

POWER STEERING GEAR
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Revision: 2006 November2007 350Z
11. Apply thread locking adhesive (Three Bond 1111B or equivalent)
to the thread of adjusting screw to the adjusting screw height
from gear housing assembly. The adjusting screw height is the
same as it was measured in the overhaul in advance.
12. Rotate pinion ten times whole range of rack so that parts get to
fit with each other.
13. Measure pinion rotating torque within from –180° to + 180°
make preload gauge (SST) and torque adapter (SST) in rack
neutral position, then hold preload gauge (SST) at maximum
torque.
14. After loosening adjusting screw once, tighten it again with torque
of 4.9 - 5.9 N·m (0.50 - 0.60 kg-m, 44 - 52 in-lb). After that
loosen it within from 20° to 40°.
15. Measure pinion rotating torque with torque adapter (SST) and
preload gauge (SST), then confirm whether its reading is within
the specified value. If the reading is not within the specified
value, readjust screw angle with adjusting screw. Change gear
assembly to new one, if the reading is still not within the speci-
fied value or the rotating torque of adjusting screw is less than 5
N·m (0.51kg-m, 44 in-lb)
16. Turn pinion fully to the end of the left with tie-rods to rack.
17. Set dial gauge to rack as shown in the figure. Measure vertical
movement of rack when pinion is turned counterclockwise with
torque of 19.6 N·m (2.0 kg-m, 14 ft-lb). Check reading is within
the specified value. If reading is outside of the specification,
readjust screw angle with adjusting screw. If reading is still out-
side of specification, or if the rotating torque of adjusting screw is
less than 5 N·m (0.51 kg-m, 44 in-lb), replace steering gear
assembly.
SGIA0568E
SGIA0159E
Pinion rotation torque:
Around neutral position (within ±100°)
Average “A”:
1.71 - 2.34 N·m (0.18 - 0.23 kg-m, 16 - 20 in-lb)
Other than above (more than ±100°)
Maximum variation “B”:
2.3 N·m (0.23 kg-m, 20 in-lb)
SGIA0160E
SGIA0773E