2007 NISSAN 350Z power steering

PS-1
POWER STEERING SYSTEM
G STEERING
CONTENTS
C
D
E
F
H
I
J
K
L
M
SECTION PS
A
B
PS
Revision: 2006 November2007 350Z
POWER STEERING SYSTEM
PRECAUTIONS .......................................................... 2
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 2
Precautions for Battery Service ................................ 2
Precautions for Steering System .............................. 2
PREPARATION ........................................................... 3
Special Service Tools ............................................... 3
Commercial Service Tools ........................................ 4
NOISE, VIBRATION AND HARSHNESS (NVH)
TROUBLESHOOTING ................................................ 5
NVH Troubleshooting Chart ..................................... 5
POWER STEERING FLUID ........................................ 6
Checking Fluid Level ................................................ 6
Checking Fluid Leakage ........................................... 6
Air Bleeding Hydraulic System ................................. 6
STEERING WHEEL .................................................... 7
On-Vehicle Inspection and Service .......................... 7
CHECKING CONDITION OF INSTALLATION ...... 7
CHECKING STEERING WHEEL PLAY ................ 7
CHECKING NEUTRAL POSITION ON STEER-
ING WHEEL .......................................................... 7
CHECKING STEERING WHEEL TURNING
FORCE .................................................................. 7
CHECKING FRONT WHEEL TURNING ANGLE ..... 8
Removal and Installation .......................................... 9
REMOVAL ............................................................. 9
INSTALLATION ..................................................... 9
STEERING COLUMN ............................................... 10
Removal and Installation ........................................ 10
COMPONENTS .................................................. 10
REMOVAL ........................................................... 10
INSPECTION AFTER REMOVAL ....................... 13
INSTALLATION ................................................... 13INSPECTION AFTER INSTALLATION ................ 14
Disassembly and Assembly .................................... 15
COMPONENTS ................................................... 15
DISASSEMBLY ................................................... 15
INSPECTION AFTER DISASSEMBLY ................ 16
ASSEMBLY ......................................................... 16
POWER STEERING GEAR AND LINKAGE ............ 17
Removal and Installation ........................................ 17
COMPONENTS ................................................... 17
REMOVAL ........................................................... 17
INSTALLATION ................................................... 18
POWER STEERING GEAR ...................................... 19
Disassembly and Assembly .................................... 19
COMPONENTS ................................................... 19
DISASSEMBLY ................................................... 20
INSPECTION AFTER DISASSEMBLY ................ 21
ASSEMBLY ......................................................... 22
POWER STEERING OIL PUMP ............................... 28
On-Vehicle Inspection and Service ......................... 28
CHECKING RELIEF OIL PRESSURE ................ 28
Removal and Installation ........................................ 28
REMOVAL ........................................................... 28
INSTALLATION ................................................... 29
Disassembly and Assembly .................................... 29
COMPONENTS ................................................... 29
INSPECTION BEFORE DISASSEMBLY ............. 30
DISASSEMBLY ................................................... 30
INSPECTION AFTER DISASSEMBLY ................ 30
ASSEMBLY ......................................................... 31
HYDRAULIC LINE .................................................... 33
Removal and Installation ........................................ 33
SERVICE DATA AND SPECIFICATIONS (SDS) ...... 35
Steering Wheel ....................................................... 35
Steering Angle ........................................................ 35
Steering Column ..................................................... 35
Steering Outer Socket and Inner Socket ................ 35
Steering Gear ......................................................... 36
Oil Pump ................................................................. 36
Steering Fluid .......................................................... 36

PS-2
PRECAUTIONS
Revision: 2006 November2007 350Z
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
NGS000FR
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:

To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions for Battery ServiceNGS000FS
Before disconnecting the battery, lower both the driver and passenger windows. This will prevent any interfer-
ence between the window edge and the vehicle when the door is opened/closed. During normal operation, the
window slightly raises and lowers automatically to prevent any window to vehicle interference. The automatic
window function will not work with the battery disconnected.
Precautions for Steering SystemNGS00003

Before disassembly, thoroughly clean the outside of the unit.

Disassembly should be done in a clean work area. It is important to prevent the internal parts from becom-
ing contaminated by dirt or other foreign matter.

For easier and proper assembly, place disassembled parts in order on a parts rack.

Use nylon cloth or paper towels to clean the parts; common shop rags can leave lint that might interfere
with their operation.

Before inspection or reassembly, carefully clan all parts in order on a parts rack.

Before assembly, apply a coat of recommended power steering fluid to hydraulic parts. Petroleum jelly
may be applied to O-rings and seals. Do not use any grease.

Replace all gaskets, seals and O-rings. Avoid damaging O-rings, seals and gaskets during installation.
Perform functional tests whenever designated.

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
PS-7
C
D
E
F
H
I
J
K
L
MA
B
PS
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

POWER STEERING GEAR AND LINKAGE
PS-17
C
D
E
F
H
I
J
K
L
MA
B
PS
Revision: 2006 November2007 350Z
POWER STEERING GEAR AND LINKAGEPFP:49001
Removal and InstallationNGS0000E
COMPONENTS
CAUTION:
Spiral cable may snap due to steering operation if steering column is separated from steering gear
assembly. Therefore fix steering wheel with a string to avoid turns.
REMOVAL
1. Set wheels in the straight-ahead position.
2. Remove undercover and tires from vehicle with power tool.
3. Remove front crossbar. Refer to FSU-8, "
Components" .
4. Confirm slit of lower joints fits with the projection on rear cover
cap, furthermore marking position on steering gear assembly
nearly fits with the projection on rear cover cap.
5. Remove cotter pin at steering outer socket, then loosen mount-
ing nut.
6. Use a ball joint remover (SST) to remove steering outer socket
from steering knuckle. Be careful not to damage ball joint boot.
CAUTION:
Tighten temporarily mounting nut to prevent damage to
threads and to prevent ball joint remover (SST) from com-
ing off.
7. Remove oil pipings (high pressure side and low pressure side)
from steering gear assembly, then drain fluid from pipings.
1. Cotter pin 2. Steering gear assembly 3. Rack mounting insulator
4. Rack mounting bracket
Refer to GI-11, "
Components" , for the symbols in the figure.
SGIA1471E
SGIA0349E
SGIA0341E

PS-18
POWER STEERING GEAR AND LINKAGE
Revision: 2006 November2007 350Z
8. Loosen bolt on upper yoke of lower joint and remove bolt on
lower yoke of joint, then slide lower joint into lower shaft. Sepa-
rate steering gear assembly from lower shaft.
9. Tack bolt on upper yoke of lower joint, fix lower joint to lower
shaft.
10. Remove the fixing bolt and remove steering gear assembly, rack
mounting bracket and insulator from vehicle.
INSTALLATION

Refer to PS-17, "Removal and Installation" for tightening torque. Install in the reverse order of removal.
NOTE:
Refer to component parts location and do not reuse non-reusable parts.

After removing/installing or replacing steering components, check wheel alignment. Refer to FSU-6,
"Wheel Alignment Inspection" .

When steering wheel is set in the straight ahead direction, con-
firm slit of lower joint fits with the projection on rear cover cap,
furthermore marking position on steering gear assembly nearly
fits with the projection on rear cover cap.

After installation, bleed air from piping. Refer to PS-6, "Air
Bleeding Hydraulic System" .
SGIA0367E
SGIA0348E
SGIA1753E

POWER STEERING GEAR
PS-19
C
D
E
F
H
I
J
K
L
MA
B
PS
Revision: 2006 November2007 350Z
POWER STEERING GEARPFP:49001
Disassembly and AssemblyNGS000B1
COMPONENTS
1. Outer socket 2. Boot clamp 3. Boot
4. Inner socket 5. Boot clamp 6. End cover assembly
7. Rack oil seal 8. Rack Teflon ring 9. O-ring A
10. Rack assembly 11. Rack oil seal 12. Gear housing assembly
13. Cylinder tube 14. Gear-sub assembly 15. Rear cover cap
16. O-ring B 17. Retainer 18. Spring
19. Adjusting screw
Refer to GI-11, "
Components" , and the followings for the symbols in the figure.
:A p p l y G e n u i n e T h r e a d L o c k i n g S e a l a n t , T h r e e B o u n d 1111 B o r e q u i v a l e n t .
SGIA1745E

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.
SGIA0360E
SGIA0568E
STC0013D
SST081B