engine NISSAN PATROL 1998 Y61 / 5.G Clutch Workshop Manual

NVH Troubleshooting Chart
Use the chart below to help you ®nd the cause of the symptom. The numbers indicate the order of inspection.
If necessary, repair or replace these parts.
Reference page (CL- )5
6
7
8
Refer to EM section.
11
13
13
13
13
13
13
13
13
14
14
14
14
SUSPECTED PARTS
(Possible cause)
CLUTCH PEDAL (Free play out of adjustment)
CLUTCH LINE (Air in line)
MASTER CYLINDER PISTON CUP (Damaged)
OPERATING CYLINDER PISTON CUP (Damaged)
ENGINE MOUNTING (Loose)
RELEASE BEARING (Worn, dirty or damaged)
CLUTCH DISC (Out of true)
CLUTCH DISC (Runout is excessive)
CLUTCH DISC (Lining broken)
CLUTCH DISC (Dirty or burned)
CLUTCH DISC (Oily)
CLUTCH DISC (Worn out)
CLUTCH DISC (Hardened)
CLUTCH DISC (Lack of spline grease)
DIAPHRAGM SPRING (Damaged)
DIAPHRAGM SPRING (Out of tip alignment)
PRESSURE PLATE (Distortion)
FLYWHEEL (Distortion)
SymptomClutch grabs/chatters 1 2 2 2 2 2
Clutch pedal spongy 1 2 2
Clutch noisy 1
Clutch slips 1 2 2 3 4 5
Clutch does not dis-
engage1234 55555 5667
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
CL-3

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

General Speci®cations
CLUTCH CONTROL SYSTEM
Type of clutch control Hydraulic
CLUTCH MASTER CYLINDER (with clutch
damper)
Unit: mm (in)
Inner diameter 17.46 (11/16)
CLUTCH OPERATING CYLINDER
Unit: mm (in)
Inner diameter 20.64 (13/16)
CLUTCH BOOSTER
Unit: mm (in)
Type M45
Diaphragm diameter 114.3 (4.50)
Check valve type Built-in hose type
CLUTCH DISC
Model 240
Engine RD28ETi
Facing size
(Outer dia. x inner dia. x thick-
ness)
mm (in)240 x 160 x 3.5
(9.45 x 6.30 x 0.138)
Thickness of disc assembly with
load
mm (in)/N (kg, lb)7.7 - 8.1 (0.303 - 0.319)/
8,336 (850, 1,874)
CLUTCH COVER
Model 240
Engine RD28ETi
Destination Ð
Full load
N (kg, lb)5,835 - 6,620
(595 - 675, 1,312 - 1,488)
Inspection and Adjustment
CLUTCH PEDAL
Unit: mm (in)
Pedal height ``H*''195 - 205
(7.68 - 8.07)
Pedal free play ``A''
(at pedal pad)1.0 - 3.0 (0.039 - 0.118)
*: Measured from surface of melt sheet to pedal pad
CLUTCH BOOSTER
Unit: mm (in)
Output rod length ``A'' 1.30 - 1.55 (0.0512 - 0.0610)
Input rod length ``B'' 130 (5.12)
CLUTCH DISC
Unit: mm (in)
Model 240
Wear limit of facing sur-
face to rivet head0.3 (0.012)
Runout limit of facing 0.7 (0.028)
Distance of runout
check point (from
the hub center)115.0 (4.53)
Maximum backlash of
spline (at outer edge of
disc)1.0 (0.039)
CLUTCH COVER
Unit: mm (in)
Model 240
Diaphragm spring height ``A''37.5 - 39.5
(1.476 - 1.555)
Uneven limit of diaphragm
spring toe height0.7 (0.028)
SERVICE DATA AND SPECIFICATIONS (SDS)
CL-16