1998 NISSAN PATROL steering

STEERING SYSTEM
SECTION
ST
CONTENTS
PRECAUTIONS AND PREPARATION............................1
Supplemental Restraint System (SRS) ``AIR
BAG'' and ``SEAT BELT PRE-TENSIONER''...............1
Precautions for Steering System .................................1
Special Service Tools ..................................................1
NOISE, VIBRATION AND HARSHNESS (NVH)
TROUBLESHOOTING.....................................................3
NVH Troubleshooting Chart.........................................3
ON-VEHICLE SERVICE..................................................4
Checking Steering Wheel Play ....................................4
Checking Neutral Position on Steering Wheel ............4
Front Wheel Turning Angle ..........................................4
Checking and Adjusting Drive Belts ............................5
Checking Fluid Level ...................................................5
Checking Fluid Leakage ..............................................5
Bleeding Hydraulic System..........................................6
Checking Steering Wheel Turning Force ....................6
Checking Hydraulic System.........................................6
STEERING WHEEL AND STEERING COLUMN............8
Removal and Installation .............................................8
Disassembly and Assembly .......................................10Inspection................................................................... 11
POWER STEERING SYSTEM (Model: PB69K)..........12
Description .................................................................12
POWER STEERING GEAR (Model: PB69K)...............13
Removal and Installation ...........................................13
Inspection...................................................................13
POWER STEERING OIL PUMP....................................15
Removal and Installation ...........................................15
Disassembly and Assembly .......................................16
Pre-disassembly Inspection .......................................16
Inspection...................................................................17
Disassembly...............................................................17
Assembly ...................................................................18
STEERING LINKAGE....................................................19
Removal and Installation ...........................................19
Disassembly...............................................................20
Inspection...................................................................20
SERVICE DATA AND SPECIFICATIONS (SDS)..........22
General Speci®cations ...............................................22
Inspection and Adjustment ........................................22
ST

Supplemental Restraint System (SRS) ``AIR
BAG'' and ``SEAT BELT PRE-TENSIONER''
The Supplemental Restraint System such as ``AIR BAG'' and ``SEAT BELT PRE-TENSIONER'' used along with
a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger in a frontal collision.
The SRS system composition which is available to NISSAN MODEL Y61 is as follows (The composition var-
ies according to the destination.):
Driver air bag module (located in the center of the steering wheel), front passenger air bag module (located
on the instrument panel on passenger side), seat belt pre-tensioner, a diagnosis sensor unit, warning lamp,
wiring harness and spiral cable.
Information necessary to service the system safely is included in theRS sectionof this Service Manual.
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 in¯ation, all maintenance must be performed
by an authorized NISSAN 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 RS section.
+Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. Spiral cable and wiring harnesses covered with yellow insulation either just before
the harness connectors or for the complete harness are related to the SRS.
Precautions for Steering System
+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
becoming contaminated by dirt or other foreign matter.
+Place disassembled parts in order, on a parts rack, for easier and proper assembly.
+Use nylon cloths or paper towels to clean the parts; common shop rags can leave lint that might
interfere with their operation.
+Before inspection or reassembly, carefully clean all parts with a general purpose, non-¯ammable
solvent.
+Before assembly, apply a coat of recommended ATF* to hydraulic parts. Vaseline 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 instal-
lation. Perform functional tests whenever designated.
*: Automatic Transmission Fluid type DEXRON
TMIII or equivalent
Special Service Tools
Tool number
Tool nameDescription
KV48100700
Torque adapter
NT169
Measuring turning torque
ST27180001
Steering wheel puller
NT544
Removing steering wheel
PRECAUTIONS AND PREPARATION
ST-1

Tool number
Tool nameDescription
ST29020001
Ball joint remover
NT551
Removing ball joint
a: 34 mm (1.34 in)
b: 6.5 mm (0.256 in)
c: 61.5 mm (2.421 in)
ST27091000
Pressure gauge
NT547
Measuring oil pressure
KV48102500
Pressure gauge adapter
NT542
Measuring oil pressure
ST3127S000
V1GG91030000
Torque wrench
V2HT62940000
Socket adapter
V3HT62900000
Socket adapter
NT541
Measuring turning torque
KV48100301
Strut and steering gear box
attachment
NT688
Disassembling and assembling steering gear
a: 162 mm (6.38 in)
b: 110 mm (4.33 in)
c: 190 mm (7.48 in)
d: 9 mm (0.35 in)
PRECAUTIONS AND PREPARATION
Special Service Tools (Cont'd)
ST-2

NVH Troubleshooting Chart
Use the chart below to help you ®nd the cause of the symptom. If necessary, repair or replace these parts.
Reference pageST-5
ST-6
ST-20
ST-20
ST-20
ST-5
ST-4
ST-6
Refer to MA section.
Ð
ST-11
ST-11
ST-10
ST-19
NVH in PD section
NVH in PD section
NVH in FA, RA section
NVH in FA section
NVH in FA section
NVH in FA section
NVH in BR section
Possible cause and
SUSPECTED PARTS
Fluid level
Air in hydraulic system
Tie-rod ball joint swinging force
Tie-rod ball joint rotating torque
Tie-rod ball joint end play
Steering gear ¯uid leakage
Steering wheel play
Steering wheel turning force
Drive belt looseness
Improper steering wheel or damage
Improper installation or looseness of tilt lock lever
Steering column deformation
Improper installation or looseness of steering column
Steering linkage looseness
PROPELLER SHAFT
DIFFERENTIAL
AXLE AND SUSPENSION
TIRES
ROAD WHEEL
AXLE SHAFT
BRAKES
Symptom STEERINGNoiseXXXXXXXXX XXXXXXX
Shake X X XXXXXX
VibrationXXXXXXXX
Shimmy X X X X X X X
Judder X X X X X
X: Applicable
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
ST-3

Checking Steering Wheel Play
+With wheels in a straight-ahead position, check steering wheel
play.
Steering wheel play:
35 mm (1.38 in) or less
+If it is not within speci®cation, check the following for loose and
worn components.
Steering gear assembly
Steering linkage
Steering column
Front suspension and axle
Checking Neutral Position on Steering Wheel
Pre-checking
+Make sure that wheel alignment is correct.
Wheel alignment:
Refer to SDS in FA section.
+Verify that the steering gear is centered before removing the
steering wheel.
Checking
1. Check that the steering wheel is in the neutral position when
driving straight ahead.
2. If it is not in the neutral position, remove the steering wheel and
reinstall it correctly.
3. If the neutral position is between two teeth, loosen drag link lock
nuts. Adjust neutral position by turning drag link adjuster.
Front Wheel Turning Angle
1. Rotate steering wheel all the way right and left; measure turn-
ing angle.
Turning angle of full turns:
Refer to SDS in FA section.
2. If not within speci®cation, adjust using stopper bolt.
SST489B
SST490BA
SST756C
SMA127
SST773C
ON-VEHICLE SERVICE
ST-4

Checking and Adjusting Drive Belts
Refer to MA section (``Checking Drive Belts'', ``ENGINE MAINTE-
NANCE'').
Checking Fluid Level
Check ¯uid level.
Use the correct range of the dipstick depending on the ¯uid tem-
perature. Use the ``HOT'' range at 50 to 80ÉC (122 to 176ÉF), or the
``COLD'' range at 0 to 30ÉC (32 to 86ÉF).
CAUTION:
+Do not over®ll.
+Recommended ¯uid is Automatic Transmission Fluid type
DEXRON
TMIII or equivalent.
Checking Fluid Leakage
Check the lines for improper attachment and for leaks, cracks,
damage, loose connections, cha®ng and deterioration.
1. Run engine between idle speed and 1,000 rpm.
Make sure temperature of ¯uid in oil tank rises to 60 to 80ÉC
(140 to 176ÉF).
2. Turn steering wheel right-to-left several times.
3. Hold steering wheel at each ``lock'' position for ®ve seconds and
carefully check for ¯uid leakage.
CAUTION:
Do not hold the steering wheel in a locked position for more
than 15 seconds.
4. If ¯uid leakage at connectors is noticed, loosen ¯are nut and
then retighten.
Do not overtighten connector as this can damage O-ring,
washer and connector.
SST280BA
SST757C
ON-VEHICLE SERVICE
ST-5

Bleeding Hydraulic System
1. Raise front end of vehicle until wheels are clear of the ground.
2. Add ¯uid into oil tank to speci®ed level. Then, quickly turn steer-
ing wheel fully to right and left and lightly touch steering stop-
pers.
Repeat steering wheel operation until ¯uid level no longer
decreases.
3. Start engine.
Repeat step 2 above.
+Incomplete air bleeding will cause the following to occur. When
this happens, bleed air again.
a. Air bubbles in reservoir tank
b. Clicking noise in oil pump
c. Excessive buzzing in oil pump
Fluid noise may occur in the valve or oil pump. This is common
when the vehicle is stationary or while turning steering wheel
slowly. This does not affect performance or durability of the system.
Checking Steering Wheel Turning Force
1. Park vehicle on a level, dry surface and set parking brake.
2. Start engine.
3. Bring power steering ¯uid up to adequate operating tempera-
ture. [Make sure temperature of ¯uid is approximately 60 to
80ÉC (140 to 176ÉF).]
Tires need to be in¯ated to normal pressure.
4. Check steering wheel turning force when steering wheel has
been turned 360É from the neutral position.
Steering wheel turning force:
39 N (4 kg, 9 lb) or less
Checking Hydraulic System
Before starting, check belt tension, driving pulley and tire pressure.
1. Set Tool. Open shut-off valve. Then bleed air. Refer to ``Bleed-
ing Hydraulic System'', ST-6.
2. Run engine at idle speed or 1,000 rpm.
Make sure ¯uid temperature in reservoir tank rises to 60 to
80ÉC (140 to 176ÉF).
WARNING:
Warm up engine with shut-off valve fully opened. If engine is
started with shut-off valve closed, ¯uid pressure in the power
steering pump increases to maximum. This will raise ¯uid tem-
perature abnormally.
3. Check pressure with steering wheel fully turned to left and right
positions with engine idling at 1,000 rpm.
CAUTION:
Do not hold the steering wheel in a locked position for more
than 15 seconds.
Power steering pump maximum operating pressure:
8,140 - 8,728 kPa (81.4 - 87.3 bar, 83 - 89 kg/cm
2,
1,180 - 1,266 psi)
+If pressure reaches maximum operating pressure, system is
OK.
+If pressure increases above maximum operating pressure,
check power steering pump ¯ow control valve. Refer to ST-16.
SST491B
SST834-E
ON-VEHICLE SERVICE
ST-6

4. If power steering pressure is below the maximum operating
pressure, slowly close shut-off valve and check pressure again.
CAUTION:
Do not close shut-off valve for more than 15 seconds.
+If pressure increases to maximum operating pressure, gear is
damaged. Refer to ``Removal and Installation'', ST-13.
+If pressure remains below maximum operating pressure, pump
is damaged. Refer to ``Disassembly'', ST-17.
5. After checking hydraulic system, remove Tool and add ¯uid as
necessary. Then completely bleed air out of system. Refer to
ST-6.
ON-VEHICLE SERVICE
Checking Hydraulic System (Cont'd)
ST-7