2006 NISSAN PATROL Service Manual

SCL768
CLUTCH SYSTEM
CL-4

Adjusting Clutch Pedal
1. Adjust pedal height with pedal stopper.
Pedal height ``H*'':
195 - 205 mm (7.68 - 8.07 in)
*: Measured from surface of dash reinforcement panel to
pedal pad
2. Adjust pedal free play with master cylinder push rod or clutch
booster input rod. Then tighten lock nut.
Pedal free play ``A'':
1.0 - 3.0 mm (0.039 - 0.118 in)
Pedal free play means the following total measured at position
of pedal pad:
+Play due to clevis pin and clevis pin hole in clutch pedal.
+Play due to piston and push rod.
+Push or step on clutch pedal until resistance is felt, and check
the distance the pedal moves.
SCL788
SCL702
INSPECTION AND ADJUSTMENT
CL-5

Air Bleeding Procedure
1. Bleed air from clutch operating cylinder according to the follow-
ing procedure.
Carefully monitor ¯uid level at master cylinder during bleeding
operation.
a. Top up reservoir with recommended brake ¯uid.
b. Connect a transparent vinyl tube to air bleeder valve.
c. Slowly depress clutch pedal to its full stroke and release it
completely. Repeat this operation several times at 2 to 3 sec-
ond intervals.
d. Hold clutch pedal depressed, open bleeder valve to release air.
e. Close bleeder valve.
f. Release clutch pedal and wait at least 5 seconds.
g . Repeat steps c through e above until brake ¯uid ¯ows from air
bleeder valve without air bubbles.
2. Repeat the above bleeding procedure 1 several times.
SCL769
INSPECTION AND ADJUSTMENT
CL-6

Clutch Master Cylinder
DISASSEMBLY AND ASSEMBLY
+When removing and installing stopper ring. Pry out or in with
screwdriver while pushing stopper.
INSPECTION
+Check cylinder and piston rubbing surface for uneven wear,
rust or damage. Replace if necessary.
+Check piston with piston cup for wear or damage. Replace if
necessary.
+Check return spring for wear or damage. Replace if necessary.
+Check reservoir for deformation or damage. Replace if neces-
sary.
+Check dust cover for cracks, deformation or damage. Replace
if necessary.
SCL770
HYDRAULIC CLUTCH CONTROL
CL-7

Clutch Operating Cylinder
INSPECTION
+Check rubbing surface of cylinder for wear, rust or damage.
Replace if necessary.
+Check piston with piston cup for wear or damage. Replace if
necessary.
+Check dust cover for cracks, deformation or damage. Replace
if necessary.
+Check piston spring for wear or damage. Replace if necessary.
SCL786
HYDRAULIC CLUTCH CONTROL
CL-8

Clutch Booster
INSPECTION
Hoses and connectors
+Check condition of vacuum hoses and connections.
+Check vacuum hoses and check valve for air tightness.
Vacuum hose check valve
1. Remove the vacuum hose.
2. Blow air through one end (booster side) of the vacuum hose
and make sure that air passage continuity exists.
3. Blow air through the other end (engine side) of the vacuum
hose and make sure that air passage continuity does not exist.
Check valve
1. Remove the vacuum hose.
2. Check the condition of the check valve using a handy vacuum
pump.
V1V2
Vacuum pump connected to the
engine sideVacuum pump connected to the booster
side
No vacuum pressure is applied.Vacuum drop is less than 1.3 kPa (13
mbar, 10 mmHg, 0.39 inHg) at a vacuum
pressure of þ66.7 kPa (þ667 mbar, þ500
mmHg, þ19.69 inHg).
SCL772
SCL782
SCL783
HYDRAULIC CLUTCH CONTROL
CL-9

ADJUSTMENT
Output rod length:
Length ``A''
1.30 - 1.55 mm (0.0512 - 0.0610 in)
If amount of adjustment required exceeds 0.5 mm (0.020 in),
reaction disc may have either been dislocated or fallen off.
Replace clutch booster assembly.
Input rod length:
Length ``B''
130 mm (5.12 in)
SCL135
SCL140
SCL136
HYDRAULIC CLUTCH CONTROL
Clutch Booster (Cont'd)
CL-10

REMOVAL AND INSTALLATION
+Install retainer spring and holder spring.
+Remove release bearing.
+Install release bearing with suitable drift.
SCL775
SCL217
CL145
SCL705
CLUTCH RELEASE MECHANISM
CL-11