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POWER STEERING SYSTEM
G STEERING

SECTION

POWER STEERING SYSTEM C

CONTENTS

PRECAUTIONS ......................................................... 2 Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" ................................................................. 2 Precautions for Battery Service ............................... 2 Precautions for Steering System ............................. 2
PREPARATION .......................................................... 3 Special Service Tools (SST) .................................... 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 ................................................... 8 On-Vehicle Inspection and Service ......................... 8
CHECKING CONDITION OF INSTALLATION ..... 8 CHECKING STEERING WHEEL PLAY ............... 8 CHECKING NEUTRAL POSITION ON STEERING WHEEL ......................................................... 8 CHECKING STEERING WHEEL TURNING FORCE ................................................................. 8 CHECKING FRONT WHEEL TURNING ANGLE..... 9 Removal and Installation ....................................... 10 REMOVAL .......................................................... 10 INSTALLATION .................................................. 10 STEERING COLUMN ...............................................11 Removal and Installation ........................................11 COMPONENTS ..................................................11 REMOVAL ...........................................................11 INSPECTION AFTER REMOVAL ...................... 14 INSTALLATION .................................................. 14

INSPECTION AFTER INSTALLATION ............... 15 F

Disassembly and Assembly ................................... 16

COMPONENTS .................................................. 16

DISASSEMBLY .................................................. 16 PS INSPECTION AFTER DISASSEMBLY ............... 17

ASSEMBLY ........................................................ 17

POWER STEERING GEAR AND LINKAGE ........... 18 Removal and Installation ....................................... 18

COMPONENTS .................................................. 18

REMOVAL .......................................................... 18 INSTALLATION .................................................. 19 I

POWER STEERING GEAR ..................................... 20

Disassembly and Assembly ................................... 20

COMPONENTS .................................................. 20 J

DISASSEMBLY .................................................. 21

INSPECTION AFTER DISASSEMBLY ............... 22

ASSEMBLY ........................................................ 23 K POWER STEERING OIL PUMP .............................. 29

On-Vehicle Inspection and Service ........................ 29

CHECKING RELIEF OIL PRESSURE ............... 29 Removal and Installation ....................................... 29 L

REMOVAL .......................................................... 29

INSTALLATION .................................................. 30

Disassembly and Assembly ................................... 30 M

COMPONENTS .................................................. 30

INSPECTION BEFORE DISASSEMBLY ............ 31

DISASSEMBLY .................................................. 31

INSPECTION AFTER DISASSEMBLY ............... 31

ASSEMBLY ........................................................ 32

HYDRAULIC LINE ................................................... 34

Removal and Installation ....................................... 34

SERVICE DATA AND SPECIFICATIONS (SDS) ..... 36

Steering Wheel ...................................................... 36

Steering Angle ....................................................... 36

Steering Column .................................................... 36

Steering Outer Socket and Inner Socket ............... 36

Steering Gear ........................................................ 37

Oil Pump ................................................................ 37

Steering Fluid ......................................................... 37

Revision: 2006 November

PS-1

2006 350Z

PRECAUTIONS

PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT

BELT PRE-TENSIONER"

NGS00074

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 Manual.
WARNING: q 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 performed by an authorized NISSAN/INFINITI dealer.
q Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag Module, see the SRS section.
q 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 Service

NGS00002

Before disconnecting the battery, lower both the driver and passenger windows. This will prevent any interference 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 System

NGS00003

q Before disassembly, thoroughly clean the outside of the unit.
q Disassembly should be done in a clean work area. It is important to prevent the internal parts from becoming contaminated by dirt or other foreign matter.
q For easier and proper assembly, place disassembled parts in order on a parts rack.
q Use nylon cloth or paper towels to clean the parts; common shop rags can leave lint that might interfere with their operation.
q Before inspection or reassembly, carefully clan all parts in order on a parts rack.
q Before assembly, apply a coat of recommended Genuine NISSAN PSF or equivalent to hydraulic parts. Petroleum jelly may be applied to O-rings and seals. Do not use any grease.
q Replace all gaskets, seals and O-rings. Avoid damaging O-rings, seals and gaskets during installation. Perform functional tests whenever designated.

Revision: 2006 November

PS-2

2006 350Z

PREPARATION

PREPARATION Special Service Tools (SST)

PFP:00002
A
NGS00004

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.

Tool number (Kent-Moore No.)

B
Description

Tool name

ST27180001 (J-25726-A) Steering wheel puller
HT72520000 (J-25730-A) Ball joint remover a: 33 mm (1.30 in) b: 50 mm (1.97 in) r: 11.5 mm (0.453 in)
ST3127S000 (See J-25765-A) Preload gauge 1. GG9103000
(J-25765-A) Torque wrench 2. HT62940000 ( ) Socket adapter 3. HT62900000 ( ) Socket adapter
KV48104400 ( ) Teflon ring installation tool a: 50 mm (1.97 in) dia. b: 36 mm (1.42 in) dia. c: 100 mm (3.94 in)

Removing steering wheel

S-NT544

F
Removing outer socket ball joint

NT546

Inspecting of rotating torque

S-NT541

K
Installing of rack Teflon ring
L
S-NT550
M

KV48103400 ( ) Torque adapter

Inspecting rotating torque

ZZA0824D

Revision: 2006 November

PS-3

2006 350Z

Tool number (Kent-Moore No.) Tool name

PREPARATION
Description

KV48103500 (J-26357) Pressure gauge
KV48102500 (J-33914) Pressure gauge adapter
Commercial Service Tools
Tool name

Measuring oil pump relief pressure
NT547

NT542

Measuring oil pump relief pressure

Description

NGS00005

Power tool

Removing oil pump and wheel nuts
PBIC0190E

Revision: 2006 November

PS-4

2006 350Z

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING NVH Troubleshooting Chart

Use chart below to help you find the cause of the symptom. If necessary, repair or replace these parts. B

C
Reference page
D

H
Possible cause and suspected parts
I

Symptom ×: Applicable

Revision: 2006 November

Noise Shake Vibration Shimmy Judder

× × ××××× × ×

Fluid level

PS-6

Air in hydraulic system

PS-6

Outer socket ball joint swinging force

PS-22

Outer socket ball joint sliding torque

PS-22

PS-5

Outer socket ball joint end play

PS-22

Steering fluid leakage

PS-6

Steering wheel play

PS-8

Steering gear rack sliding force

PS-22

Drive belt looseness

EM-14

×××

×××××

×××

Improper steering wheel

PS-8

Improper installation or looseness of tilt lock lever

PS-16

Mounting rubber deterioration

PS-18

Steering column deformation or damage

PS-11

Improper installation or looseness of steering column

PS-11

Steering linkage looseness

PS-18

PFP:00003
A
NGS00006

× × × × ×× × K

PROPELLER SHAFT

NVH in PR section

DIFFERENTIAL

NVH in RFD section

× × ×× ×

××

×××

AXLE and SUSPENSION

NVH in FAX, RAX, FSU, RSU section

TIRES

NVH in WT section

2006 350Z

ROAD WHEEL

NVH in WT section

DRIVE SHAFT

NVH in RAX section

BRAKES

NVH in BR section

POWER STEERING FLUID

PFP:KLF20

Checking Fluid Level

NGS00007

q Stop engine before performing a fluid level check.
q Ensure that fluid level is between the MAX range and MIN level. q Because fluid level differs within the HOT range and the COLD
range, check it carefully.

HOT : Fluid temperatures from 50 to 80 °C (122 to 176°F)
COLD : Fluid temperatures from 0 to 30°C (32 to 86°F)

CAUTION: q Do not overfill the MAX level.
q Do not reuse any used power steering fluid.
q Recommended fluid is Genuine NISSAN PSF or equivalent.

SGIA0232J

Checking Fluid Leakage

NGS00008

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.)

SST836C

4. If fluid leakage at connections is noticed, then loosen flare nut and then retighten. Do not over tighten connector 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 System

NGS00009

Incomplete air bleeding causes the following. When this happens, bleed air again.
q Generation of air bubbles in reservoir tank
q Generation of clicking noise in oil pump
q 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.

Revision: 2006 November

PS-6

2006 350Z

POWER STEERING FLUID
6. Stop engine, check fluid level. A B C D E F
PS H I J K L M

Revision: 2006 November

PS-7

2006 350Z

STEERING WHEEL

STEERING WHEEL
On-Vehicle Inspection and Service
CHECKING CONDITION OF INSTALLATION
q Check installation condition of steering gear assembly, front suspension, axle and steering column.
q Check if movement exists when steering wheel is moved up and down, to the left and right and to the axial direction.

PFP:48430
NGS0000A

End play of the axle direction for steering wheel: 0 mm (0 in)

q Check if the mounting bolts for steering gear assembly are loose or not. Refer to PS-18, "POWER STEERING GEAR AND LINKAGE" .

SGIA0348E

CHECKING STEERING WHEEL PLAY
1. Set tires to the straight ahead, start engine, then turn steering wheel to the left and right lightly, and measure steering wheel movement on the outer circumference when steering wheel is turned up to the point where tires start moving.

Steering wheel play on the outer circumference : 0 - 35 mm (0 - 1.38 in)

CHECKING NEUTRAL POSITION ON STEERING WHEEL q Check neutral position on steering wheel after confirming that front wheel alignment is correct. Refer to
PS-36, "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.

Steering wheel turning : 7.45 N·m (0.76 kg-m, 66 in-lb) force

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-29, "CHECKING RELIEF OIL PRESSURE" .

SGIA1136E

a. Disconnect lower joint and steering knuckle from steering gear assembly. Refer to PS-18, "Removal and Installation" , FAX-4, "Removal and Installation" .

b. Start and run engine at idle to make sure steering fluid has reached normal operating temperature.

Revision: 2006 November

PS-8

2006 350Z

STEERING WHEEL

c. While pulling outer socket slowly in ± 11.5 mm (± 0.453 in) range from neutral position, make sure rack sliding force is within
specification.

Rack sliding force:

171 - 234 N (17.4 - 23.9 kg, 38 - 53 lb)

d. If rack sliding force is not within specification, overhaul steering gear assembly.

CHECKING FRONT WHEEL TURNING ANGLE
q Check front wheel turning angle after the toe-in inspection. Place front wheels on turning radius gauges 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.

q Start engine and run at idle, turn steering wheel all the way right and left, measure the turning angle.

Inner wheel (Angle: A) Outer wheel (Angle: B)

Minimum Nominal Maximum Nominal

35° 55' (35.9°) 38° 55' (38.9°) 39° 55' (39.9°) 30° 40' (30.7°)

q If it is not within specification, measure rack strokes.
Rack stroke "L" : 64.5 mm (2.539 in)
q If rack stroke is out of specification, disassemble steering gear assembly to check rack stroke.
q Any turning angles are not adjustable. If any of steering angles are out of the specification, check if the following parts are wear or damaged.
Steering gear Steering column Front suspension components
If found that they are worn or damaged, replace them with new ones respectively.

A B C
SST090B
D E F PS
FAA0016D
H I J K
SGIA0055E
L M
SGIA0629J

Revision: 2006 November

PS-9

2006 350Z

STEERING WHEEL

Removal and Installation
REMOVAL

NGS0000B

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-46, "Removal and Installation" .

3. Remove steering wheel lock nut after steering is locked.

4. Remove steering wheel with the steering wheel puller A.

Tool number A: ST27180001 (J-25726-A)

SGIA1323E
INSTALLATION Installation is the reverse order of removal. For tightening torque, refer to PS-11, "Removal and Installation" . NOTE: Check the spiral cable neutral position after replacing or rotating spiral cable. Refer to SRS-48, "Removal and Installation" .

Revision: 2006 November

PS-10

2006 350Z

STEERING COLUMN
Removal and Installation
COMPONENTS

STEERING COLUMN

PFP:48810
A
NGS0000C
B

K
SGIA0339E

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

CAUTION: q Care must be taken not to give axial impact to steering column assembly during removal and
installation.
q 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-46, "DRIVER AIR BAG MODULE" . 3. Disconnect steering switch connector, remove steering wheel lock nut, then remove steering wheel. Refer
to PS-8, "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-30, "Removal and Installation for Combination Meter" .

Revision: 2006 November

PS-11

2006 350Z

STEERING COLUMN
7. Remove combination switch & spiral cable from steering column assembly. Refer to SRS-48, "Removal and Installation" .
8. Disconnect the following connector from steering column assembly. q Steering lock harness connector q Ignition switch harness connector q Key switch harness connector
9. Remove control unit with VDC/TCS/ABS control unit. Refer to BRC-154, "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 (reaction), and then the set lib will be in squeezed to the thick part of yoke.

Revision: 2006 November

PS-12

SGIA0368E SGIA0724E SGIA0353E SGIA0354E
2006 350Z

STEERING COLUMN
e. Yoke will be removed from collar, when steering column assembly is lifted about 45° oblique upward.
f. Collar remains on lower shaft.
12. Remove bolts and nut from steering member, remove steering column assembly from steering member.
13. Remove collar from lower shaft. 14. Remove hole cover seal from lower shaft. 15. Remove mounting bolts, then remove hole cover from panel.
16. Raise vehicle, then loosen bolt for lower yoke of lower joint and remove joint together with lower shaft.

C
SGIA0355E
D

SGIA0356E

I J

SGIA0373E

SGIA0765E

Revision: 2006 November

PS-13

2006 350Z

STEERING COLUMN

INSPECTION AFTER REMOVAL
q Check if there is something wrong with jacket tube of steering column assembly and collar etc. And then if they are damaged, replace with new one.
q If vehicle has a collision light shocked, check column length "L" as shown in the figure. Then if it is out of the specified value, replace with new one.

Specified value
Steering column length "L": 548 mm (21.57 in)
q Check the turning torque of steering column with preload gauge (SST: ST3127S000 [J-25765-A]). If it is out of the specified value, repair it or replace with new one.

Specified value Turning torque : 0 - 0.2 N·m (0 - 0.02 kg-m, 0 - 2 in-lb)

SGIA0306J

INSTALLATION 1. Install collar to lower shaft.

2. Install yoke of column shaft to collar, tack bolt and nut.

SGIA0356E

SGIA0353E

Revision: 2006 November

PS-14

2006 350Z

STEERING COLUMN
3. Put steering column assembly (installation hole "P") on bolt for steering member side and install nut "A" then tighten it together with the other bolts at the specified torque.
4. Connect yoke and collar with bolt, tighten nut at the specified torque.
INSPECTION AFTER INSTALLATION q After installing steering column to vehicle, check tilt device and
its operation range "L1" , "L2" . Tilt operating range "L1 " : 28 - 32 mm (1.10 - 1.26 in) "L2 " : 13 - 17 mm (0.51 - 0.67 in)
q Check if steering operation can turn to the end of the left and right smoothly.

SGIA0371E

I J

SGIA1456E

Revision: 2006 November

PS-15

2006 350Z

STEERING COLUMN
Disassembly and Assembly
COMPONENTS

NGS0000D

1. Steering column shaft 4. Jacket tube 7. Column mounting bracket 10. Lock nut

2. Adjusting bolt 5. Steering column shaft lock nut 8. Tilt lever stopper

3. Adjusting stopper 6. Spring 9. Tilt lever

SGIA0340E

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.

SGIA0742E

Revision: 2006 November

PS-16

2006 350Z

STEERING COLUMN
c. Lock adjusting bolt, then remove lock nut. A

d. Remove adjusting bolt, adjusting stopper, column mounting bracket, tilt lever stopper and tilt lever from jacket tube.

C
SGIA0343E
D
E

SGIA0344E

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

q 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-16, "Disassembly and Assembly" .

NOTE:

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

q 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.
Tightening torque: 13.5 - 18.6 N·m (1.4 - 1.8 kg-m, 10 - 13 ft-lb)
3. Apply grease to the part shown in the figure of component. Refer to PS-16, "Disassembly and Assembly" .
4. Install steering column shaft to jacket tube, tighten steering column shaft lock nut at the specified torque.
Tightening torque : 25 - 34 N·m (2.6 - 3.4 kg-m, 19 - 25 ft-lb)

M
SGIA0346E
SGIA0347E

Revision: 2006 November

PS-17

2006 350Z

POWER STEERING GEAR AND LINKAGE
POWER STEERING GEAR AND LINKAGE Removal and Installation
COMPONENTS

PFP:49001
NGS0000E

1. Cotter pin

2. Steering gear assembly

4. Rack mounting bracket

Refer to GI-10, "Components" , for the symbols in the figure.

3. Rack mounting insulator

SGIA1471E

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 mounting 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 coming off.
7. Remove oil pipings (high pressure side and low pressure side) from steering gear assembly, then drain fluid from pipings.

Revision: 2006 November

PS-18

SGIA0349E
SGIA0341E
2006 350Z

POWER STEERING GEAR AND LINKAGE

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.

SGIA0367E

INSTALLATION

SGIA0348E
K

q Refer to PS-18, "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.

q After removing/installing or replacing steering components, check wheel alignment. Refer to FSU-6,

"Wheel Alignment Inspection" .

q 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.

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

SGIA1753E

Revision: 2006 November

PS-19

2006 350Z

POWER STEERING GEAR
POWER STEERING GEAR Disassembly and Assembly
COMPONENTS

PFP:49001
NGS000B1

1. Outer socket

2. Boot clamp

4. Inner socket

5. Boot clamp

7. Rack oil seal

8. Rack Teflon ring

10. Rack assembly

11. Rack oil seal

13. Cylinder tube

14. EPS solenoid valve

16. Gear sub-assembly

17. Rear cover cap

Refer to GI-10, "Components" , and the followings for the symbols in the figure.

: Apply Genuine Thread Locking Sealant, Three Bound TB1111 or equivalent.

: Apply multi-purpose grease.

: Apply Genuine Nissan PSF or equivalent.

Revision: 2006 November

PS-20

3. Boot 6. End cover assembly 9. O-ring A 12. Gear housing assembly 15. O-ring B

SGIA1476E
2006 350Z

POWER STEERING GEAR

CAUTION:

q 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.

q 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.

SGIA0360E

DISASSEMBLY

1. Remove fixing bolts of EPS solenoid valve, and then remove EPS solenoid valve from gear-sub assembly.

2. Remove cylinder tubes from gear housing assembly.

3. Remove rear cover cap from gear sub-assembly.

4. Measure adjusting screw height from gear housing assembly, then loosen adjusting screw.

CAUTION: q Do not turn adjusting screw more than twice.
PS q Replace steering gear assembly when adjusting screw is
removed or more than twice.

5. Remove fixing bolts of gear sub-assembly, and then remove gear sub-assembly from gear housing assembly.

6. Remove O-ring B from gear housing assembly.

7. Loosen lock nut of outer socket, and remove outer socket.
8. Remove boot clamps of the small diameter side and the large diameter side, then remove boots.

SGIA0568E

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.

9. 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.

10. 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.
11. 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.

STC0013D SST081B

Revision: 2006 November

PS-21

2006 350Z

POWER STEERING GEAR
12. Heat rack Teflon ring to approximately 40°C (104°F) with a dryer, then remove it and O-ring A from rack assembly. CAUTION: Be careful not to damage rack. If it is damaged, change to a new one to avoid oil leaks.

13. Use a taped 29 mm (1.14 in) socket and an extension bar. Remove rack oil seal from gear housing assembly.
CAUTION: Be careful not to damage gear housing assembly and cylinder inner wall. If it is damaged, gear housing assembly must be replaced. Otherwise, oil leaks will result.

SGIA0151E

INSPECTION AFTER DISASSEMBLY Boot Check boot for cracks and deformation. Replace it, if necessary.
Rack Assembly Check rack for damage and wear. Replace it, if necessary.
Gear Sub-Assembly q Check pinion gear for damage or wear. Replace if necessary. q Rotate pinion and check for torque variation or rattle. Replace if necessary.
Gear Housing Assembly Check gear housing assembly for damage and scratches (inner wall). Replace it, if necessary.
Outer Socket and Inner Socket Swing Torque q Hook a spring balance at the point shown in the figure. Confirm
if the reading is within the specification. When ball stud and inner socket start moving the measured value must be within the specification. If the reading is outside the specification, replace socket.

SGIA0179E

SGIA0358E

Revision: 2006 November

PS-22

2006 350Z

POWER STEERING GEAR

Specified value
Item

Outer socket

Inner socket

Measuring point

Cotter-pin hole of stud

shown as L: 48.5 mm (1.909 in)

Swing torque Measuring value

0.3 - 2.9 N·m (0.03 - 0.29 kg-m, 3 - 25 in-lb) 4.42 - 42.7 N (0.5 - 4.4 kg, 1 - 10 lb)

1.0 - 7.8 N·m (0.11 - 0.79 kg-m, 9 - 69 in-lb)

10 - 78 N (1 - 8 kg, 2 - 18 lb)

Rotating Torque

q Using a preload gauge (SST), check if reading is within the

value specified below. If the value is outside the standard,

replace outer sockets.

Rotating torque

0.3 - 2.9 N·m (0.03 - 0.29 kg-m, 3 - 25 in-lb)

Axial End Play
q Apply load of 490 N (50 kg,110 lb) to ball stud axially. Use a dialgauge to measure the amount of the movement that the stud makes. Check if the reading is within the specified below. If the value is outside the standard, replace outer and inner sockets.

Outer socket Inner socket

0.5 mm (0.020 in) or less 0.2 mm (0.008 in) or less

F
SGIA0941E
PS H I

ASSEMBLY 1. Apply Genuine NISSAN PSF or equivalent to O-ring A. Put an O-ring A into rack Teflon ring.
NOTE: Do not reuse O-ring A.
2. Heat rack Teflon ring to approximately 40°C (104°F) with a dryer. Assemble it to mounting groove of rack.
NOTE: Do not reuse rack Teflon ring.

J
SGIA1437E
K L M

SGIA0153E

Revision: 2006 November

PS-23

2006 350Z

POWER STEERING GEAR
3. To fit rack Teflon ring on rack, use rack Teflon ring installation tool (SST) from tooth side. Compress rim of ring with the tool.
4. Apply Multi-purpose grease or equivalent to rack oil seal. Insert rack oil seal, then insert rack to gear housing assembly. NOTE: Do not reuse rack oil seal. CAUTION: q When inserting rack, do not damage retainer sliding part. If it is damaged, replace gear housing assembly. q When unstring rack, do not damage cylinder inner wall. If it is damaged, It may cause oil leaks. Replace gear housing assembly. q Attach rack oil seal. Both inner lip and outer lip should face each other.
a. To avoid damaging inner rack oil seal, wrap an OHP sheet [approximately. 70 mm (2.76 in) × 100 mm (3.94 in)] around rack tooth. Place oil seal on sheet. Then, pull oil seal along with OHP sheet until they pass the toothed section of rack, then remove it.
b. Insert rack oil seal (inner) to piston (rack Teflon ring) position and push retainer to adjust screw side with fingers lightly, and then make rack move in gear housing assembly, install rack oil seal (inner) to fit in with gear housing assembly.

SGIA0154E SGIA0205E SGIA0155E SGIA0548E

Revision: 2006 November

PS-24

2006 350Z

POWER STEERING GEAR
c. When installing outer rack oil seal, cover the end of rack with an OHP sheet [70 mm (2.76 in) × 100 mm (3.94 in)]. It will avoid damaging rack oil seal. Then place oil seal on sheet. Pull rack oil seal along with OHP sheet until they pass rack end. Then remove OHP sheet.
d. Install end cover assembly to rack, move it to gear housing assembly.
5. Using a 42 mm (1.65 in) open head (suitable tool), tighten end cover assembly at the specified torque. CAUTION: Do not damage rack surface. If it is damaged, it may cause oil leaks. Replace rack assembly.
6. After tightening end cover assembly, caulk cylinder at one point as shown in the figure using a punch. This will prevent end cover from getting loose.
7. Apply Genuine NISSAN PSF or equivalent to O-ring B. Install Oring B to gear housing assembly. NOTE: Do not reuse O-ring B.
8. Install gear sub-assembly to gear housing assembly. 9. Install EPS solenoid valve to gear sub-assembly.

10. Decide neutral position of rack. Rack stroke "L" : 64.5 mm (2.539 in)

Revision: 2006 November

PS-25

C
SGIA0157E
D

SST081B

PS H

I J

SGIA0158E

SGIA0359E

SGIA0629J
2006 350Z

POWER STEERING GEAR
11. Install the projection part (Tip) of rear cover cap to gear subassembly as shown in the figure.

12. Apply thread locking adhesive (Three Bond TB1111B 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.
13. Rotate pinion ten times whole range of rack so that parts get to fit with each other.
14. 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.
15. 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°.
16. 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 specified value or the rotating torque of adjusting screw is less than 5 N·m (0.51kg-m, 44 in-lb) 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)
17. Turn pinion fully to the end of the left with tie-rods to rack.

Revision: 2006 November

PS-26

SGIA1753E SGIA0568E SGIA0159E SGIA0160E
2006 350Z

POWER STEERING GEAR

18. 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 outside 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.

Specified value

SGIA0773E
D

Amount of vertical movement with rack

Less than 0.265 mm (0.0104 in)

Measuring point

Axial direction of rack

5 mm (0.20 in) away from end of gear housing

Radius direction of rack

Shaft direction of adjusting screw

19. Install large-diameter side of boot to gear housing assembly.

20. Install small-diameter side of boot to the mounting groove of

inner socket boot.

21. Install boot clamp to the small-diameter side of boot.

22. Install boot clamp to the large-diameter side of boot.

NOTE:

Do not reuse boot clamp.

a. Tighten large-diameter side of RH/LH boot with boot clamp (stainless wire). Wire length "L" : 370 mm (14.57 in)
b. After wrapping clamp around boot groove for two turns, insert screwdriver in loop on both ends of wire. Twist 4 to 4.5 turns while pulling with a force of approx. 98 N (10 kg, 22 lb).
c. Twist boot clamp as shown in the figure, pay attention to relationship between winding and twisting directions.

SGIA0550E

L
SGIA0163E
M

Revision: 2006 November

PS-27

SGIA0164E
2006 350Z

POWER STEERING GEAR
d. Confirm the twisted point with clamp faces in the opposite direction to adjusting screw within 30° as shown in the figure.
e. After twisting wire 4 to 4.5 turns, bend cut end of wire. Cut end of wire should not touch boot. Be sure wire end is at least 5 mm (0.20 in) away from clearance for tube.
23. Install cylinder tubes to gear housing assembly.
24. Tighten lightly inner socket in specified length "L", then tighten lock nut at specified torque. Refer to PS-20, "COMPONENTS" . Reconfirm if inner socket length is within limit of specified length "L". Inner socket length "L" : 106.3 mm (4.19 in) CAUTION: Perform toe-in adjustment after this procedure. Length achieved after toe-in adjustment is not necessarily value given here.

SGIA0361E SGIA0166E SGIA0360E SGIA0167E

Revision: 2006 November

PS-28

2006 350Z

POWER STEERING OIL PUMP
POWER STEERING OIL PUMP
On-Vehicle Inspection and Service
CHECKING RELIEF OIL PRESSURE CAUTION: Before starting work, confirm belt tension is proper. 1. Connect oil pressure gauge (SST) and oil pressure gauge
adapter (SST) between oil pump discharge connector and high pressure hose and then bleed air from the hydraulic circuit.

PFP:49110
A
NGS0000H
B
C
D

SGIA0814E

2. Start engine. Allow engine to run until tank temperature reaches 50 to 80°C (122 to 176°F).
CAUTION: q Warm up engine with shut-off valve fully opened. If
engine is started with shut-off valve closed, fluid pressure in power steering pump increases to maximum. This will raise fluid temperature excessively.
q Be careful not to contact hose with belt when engine is started.
3. With engine at idle, close shut-off valve and read the relief oil pressure.

F
PS
H
I
SGIA0813E

Relief oil pressure:

9,600 - 10,200 kPa (97.9 - 104 kg/cm2 , 1,392 - 1,479 psi)

CAUTION:

Do not close shut-off valve of pressure gauge for more than 10 seconds.

4. After measurement, open shut-off valve slowly.

q If relief oil pressure is outside the specification, disassemble and repair oil pump. Refer to PS-30, "Dis-

assembly and Assembly" .

5. After inspection, disconnect oil pressure gauge (SST) and oil pressure gauge adapter (SST) from hydrau-

lic circuit, connect oil pump discharge connector and high pressure hose. Add fluid and bleed air from

hydraulic circuit thoroughly. Refer to PS-6, "Air Bleeding Hydraulic System" . M

Removal and Installation

NGS0000I

REMOVAL

1. Remove engine cover.

2. Remove air cleaner box.

3. Drain water from radiator upper tank, then remove radiator upper hose.

4. Remove radiator fan shroud. Refer to CO-13, "Removal and Installation" .

Revision: 2006 November

PS-29

2006 350Z

POWER STEERING OIL PUMP
5. Loosen idler pulley, then remove belt. 6. Drain power steering fluid from reservoir tank. 7. Remove piping of high pressure and low pressure (drain fluid
from their pipings) 8. Remove bolt common to water pump and power steering pump. 9. Remove bolt then remove power steering pump.

INSTALLATION Refer to PS-34, "HYDRAULIC LINE" for tightening torque. Install in the reverse order of removal. q After installation, adjust belt tension. Refer to EM-14, "DRIVE BELTS" . q After installation, bleed air. Refer to PS-6, "Air Bleeding Hydraulic System" .
Disassembly and Assembly
COMPONENTS

SGIA0376E NGS0000J

1. Plug 4. Relief valve assembly 7. Oil seal 10. Suction connector assembly 13. O-ring B 16. Cover assembly 19. Rotor snap ring 22. Dowel pin

2. O-ring D 5. Flow control valve assembly 8. Bracket 11. O-ring E 14. Cartridge assembly 17. Side plate 20. Cam ring

3. Flow control valve spring 6. Shaft kit 9. Body assembly 12. O-ring C 15. O-ring A 18. Vane 21. Rotor

SGIA0774E

Revision: 2006 November

PS-30

2006 350Z

POWER STEERING OIL PUMP

INSPECTION BEFORE DISASSEMBLY

Disassemble power steering oil pump only if the following items are

found.

q Oil leakage from oil pump

q Deformed or damaged pulley

q Poor performance

D
SGIA0170E

DISASSEMBLY

NOTE:

Fix oil pump in vise as the occasion demands.

CAUTION:

When retaining drive shaft in a vise, always use copper or aluminium plates between vise and shaft.

1. Unscrew two front bracket bolts and remove bracket from body assembly.

2. Unscrew four cover assembly bolts and remove cover assembly from body assembly.

3. Remove O-ring A from body assembly.

4. Remove rotor snap ring with snap ring pliers, and remove shaft

kit from body assembly.

CAUTION:

When removing rotor snap ring, be careful not to damage

pulley shaft of shaft kit.

J
SGIA0059E

5. Using a screwdriver, remove oil seal for body assembly.
6. Remove cam ring, rotor, vane, side plate, O-ring B and O-ring C from body assembly.
7. Remove plug, then remove O-ring D, flow control valve spring, relief valve assembly and flow control value assembly from body assembly.
CAUTION: Be careful not to drop and deform relief valve assembly and flow control valve assembly.
8. Remove fixing bolt of suction connector assembly, then remove suction connector assembly and O-ring E from body assembly.

K L M
SST034A

INSPECTION AFTER DISASSEMBLY Body Assembly and Cover Assembly Inspection
q Check body assembly and cover assembly for damage. If any damage is found, replace with new part for cover assembly, and replace with new power steering pump assembly for body assembly.

Cartridge Assembly Inspection
q Check cam ring, side plate, rotor and vane for damage. If any damage is found, replace cartridge assembly with new one.

Relief Valve Assembly Inspection q Check relief valve assembly for damage. If any damage is found, replace it with new one.

Revision: 2006 November

PS-31

2006 350Z

POWER STEERING OIL PUMP

Flow Control Valve Assembly Inspection q Check flow control valve assembly for damage. If any damage is found, replace it with new one.

ASSEMBLY

NOTE: Fix oil pump in vise as occasion demands.

CAUTION: When retaining drive shaft in a vise, always use copper or aluminium plates between vise and shaft.

1. Apply a coat of Multi-purpose grease or equivalent to oil seal lip and to the circumference of oil seal. Using proper tool such as hand press machine, install it to the body assembly.

NOTE: Do not reuse oil seal.

2. Install shaft kit to body assembly.

3. Apply a coat of NISSAN PSF or equivalent to O-ring B and Oring C, then install O-ring B and O-ring C to body assembly.

NOTE: Do not reuse O-ring B and O-ring C.

SST038A

4. Set dowel pin at the illustration position (The position is the same regardless of right or left direction), and install side plate to body assembly.

5. Install cam ring on side plate as follows;
q Turn chamfered edge side of cam ring to side plate as shown in the figure.
q Position large chamfered side of cam ring as shown in the figure.

SGIA0171E SGIA0172E

Revision: 2006 November

PS-32

SGIA0173E
2006 350Z

POWER STEERING OIL PUMP

6. Install rotor to shaft of shaft kit (rotor direction is the same

regardless of the front and back).

7. Install vane to rotor (vane direction is the same regardless of inside and outside).

8. Install rotor snap ring to shaft of shaft kit.

NOTE: q Do not reuse rotor snap ring.

CAUTION:

Be careful not to damage rotor and pulley shaft.

9. Apply a coat of NISSAN PSF or equivalent to O-ring A, then install O-ring A to body assembly.

SGIA0174E
D

NOTE: Do not reuse O-ring A.

10. Attach cover assembly to body assembly and tighten fixing bolts diagonally at the specified torque.

11. Install flow control valve assembly, relief valve assembly and flow control valve spring to body assembly.

12. Apply a coat of NISSAN PSF or equivalent to O-ring D and install to plug, then tighten plug at the specified

torque.

NOTE: Do not reuse O-ring D.

13. Apply a coat NISSAN PSF or equivalent to O-ring E and install to suction connector assembly, then install PS suction connector to body assembly.

NOTE:

Do not reuse O-ring E.

14. Install bracket to body assembly, and tighten mounting bolts at the specified torque.

Revision: 2006 November

PS-33

2006 350Z

HYDRAULIC LINE Removal and Installation

HYDRAULIC LINE

PFP:49721
NGS0000K

Revision: 2006 November

PS-34

SGIA0741E
2006 350Z

HYDRAULIC LINE

1. Reservoir tank

2. Reservoir tank bracket

3. Hose & tube assembly

4. Suction hose

5. Oil pressure sensor

6. Eye bolt

7. Oil cooler

8. Copper washer

9. Power steering oil pump

10. Steering gear assembly 13. Clip

11. Common bolt

12. Oil pump bracket
B

Revision: 2006 November

PS-35

2006 350Z

SERVICE DATA AND SPECIFICATIONS (SDS)

SERVICE DATA AND SPECIFICATIONS (SDS) Steering Wheel

End play of the axle direction for steering wheel Steering wheel play on the outer circumference
Steering Angle

Inner wheel Degree minute (Decimal degree)
Outer wheel Degree minute (Decimal degree)
Steering Column

Minimum Nominal Maximum
Nominal

Steering column length "L"

0 mm (0 in) 0 - 35 mm (0 - 1.38 in) or less
35° 55' (35.9°) 38° 55' (38.9°) 39° 55' (39.9°) 30° 40' (30.7°)

PFP:00030
NGS0000L
NGS0000M

548 mm (21.57 in)

NGS0000N

SGIA0306J

Steering Outer Socket and Inner Socket

NGS0000O

Steering gear type Outer socket ball joint outer socket
Inner socket ball joint inner socket

Swinging torque Measurement on spring balance q Measuring point: stud cotter pin hole Rotating torque Axial end play Swinging torque Measurement on spring balance q Measuring point: L mark see below,
L=48.5 mm (1.91 in). Axial end play

PR26AF 0.3 - 2.9 N·m (0.03 - 0.29 kg-m, 3 - 25 in-lb)
4.42 - 42.7 N (0.5 - 4.4 kg, 1 - 10 lb) 0.3 - 2.9 N·m (0.03 - 0.29 kg-m, 3 - 25 in-lb)
0.5 mm (0.020 in) or less 1.0 - 7.8 N·m (0.11 - 0.79 kg-m, 9 - 69 in-lb)
10 - 78 N (1 - 8 kg, 2 - 18 lb)
0.2 mm (0.008 in) or less

Revision: 2006 November

SGIA0358E
PS-36

2006 350Z

SERVICE DATA AND SPECIFICATIONS (SDS)

Inner socket length "L"

106.3 mm (4.19 in)
A

Steering Gear
Steering gear model Rack neutral position, dimension "L" (rack stroke)

SGIA0167E

PR26AF 64.5 mm (2.539 in)

NGS0000P
E F

Oil Pump
Oil pump relief hydraulic pressure
Steering Fluid
Fluid capacity

I
SGIA0629J

NGS0000Q
J
9,600 - 10,200 kPa (97.9 - 104 kg/cm2 , 1,392 - 1,479 psi)

Approx. 1.0 (1-1/8 US qt, 7/8 Imp qt)

NGS0000R
K

Revision: 2006 November

PS-37

2006 350Z

SERVICE DATA AND SPECIFICATIONS (SDS)

Revision: 2006 November

PS-38

2006 350Z

Acrobat Distiller 4.05 for Windows FrameMaker SGML 5.5.6p145J