2007 NISSAN 350Z Power Steering System Workshop Manual

POWER STEERING GEAR AND LINKAGE
PS-17
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D
E
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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
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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

POWER STEERING GEAR
PS-21
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Revision: 2006 November2007 350Z
11. 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.
12. 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 cylin-
der inner wall. If it is damaged, gear housing assembly
must be replaced. Otherwise, oil leaks will result.
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

Check pinion gear for damage or wear. Replace if necessary.

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

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.
SGIA0151E
SGIA0179E
SGIA0358E

PS-22
POWER STEERING GEAR
Revision: 2006 November2007 350Z
Specified value
Rotating Torque

Using a preload gauge (SST), check if reading is within the
value specified below. If the value is outside the standard,
replace outer sockets.
Axial End Play

Apply load of 490 N (50 kg,110 lb) to ball stud axially. Use a dial-
gauge 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.
ASSEMBLY
1. Apply recommended fluid 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.
Item Outer socket Inner socket
Measuring point Cotter-pin hole of stud shown as L: 48.5 mm (1.909 in)
Swing torque 0.3 - 2.9 N·m (0.03 - 0.29 kg-m, 3 - 25 in-lb) 1.0 - 7.8 N·m (0.11 - 0.79 kg-m, 9 - 69 in-lb)
Measuring value 4.42 - 42.7 N (0.5 - 4.4 kg, 1 - 10 lb) 10 - 78 N (1 - 8 kg, 2 - 18 lb)
Rotating torque 0.3 - 2.9 N·m (0.03 - 0.29 kg-m, 3 - 25 in-lb)
SGIA0941E
Outer socket 0.5 mm (0.020 in) or less
Inner socket 0.2 mm (0.008 in) or less
SGIA1437E
SGIA0153E

POWER STEERING GEAR
PS-23
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Revision: 2006 November2007 350Z
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:

When inserting rack, do not damage retainer sliding part.
If it is damaged, replace gear housing assembly.

When unstring rack, do not damage cylinder inner wall. If
it is damaged, It may cause oil leaks. Replace gear hous-
ing assembly.

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

PS-24
POWER STEERING GEAR
Revision: 2006 November2007 350Z
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 recommended fluid to O-ring B. Install O-ring B to gear
housing assembly.
NOTE:
Do not reuse O-ring B.
8. Install gear-sub assembly to gear housing assembly.
9. Decide neutral position of rack.
10. Install the projection part (Tip) of rear cover cap to gear-sub
assembly as shown in the figure.
SGIA0157E
SST081B
SGIA0158E
Rack stroke “L” : 64.5 mm (2.539 in)
SGIA0629J
SGIA1753E