1998 NISSAN PATROL piston

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

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

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