Diagnosis And Testing Diagnosis And Testing-Clutch System Diagnosis - Chrysler PT Cruiser Service & Repair Manual

PT
CLUTCH (Continued)
Slave cylinder spring force causes the release lever
to hold the release bearing in contact with the dia-
phragm spring, also known as bearing preload. Dur-
ing a clutch pedal actuation, the hydraulic fluid
pressure applies additional force to the release lever.
As additional force is applied, the bearing presses the
diaphragm spring fingers inward on the fulcrums.
This action moves the pressure plate rearward,
relieving clamp force on the disc.
G288-Equipped Models
The clutch hydraulic system is responsible for
engaging and disengaging the clutch. Depressing the
clutch pedal develops fluid pressure in the clutch
master cylinder. This pressure is transmitted to the
slave cylinder through a connecting line.
Slave cylinder force transmits through the integral
release bearing, which is in contact with the pressure
plate diaphragm spring. As additional force is
applied, the bearing depresses the diaphragm spring
fingers inward on the fulcrums. The action moves the
CONDITION
CLUTCH DISC FACING
COVERED WITH OIL OR
GREASE
NO FAULT FOUND WITH
CLUTCH
COMPONENTS
PARTIAL ENGAGEMENT
OF CLUTCH DISC
SERVICE DIAGNOSIS - CLUTCH GRAB/CHATTER
POSSIBLE CAUSES
Oil leak at engine rear main or
transaxle input shaft seal.
Too much grease applied to splines
of disc and input shaft.
Problem actually related to
suspension or driveline component.
Engine related problems.
Clutch cover, spring, or release
fingers bent, distorted (rough
handling, improper assembly).
Clutch disc damaged or distorted.
Clutch misalignment.
pressure plate rearward, relieving clamping force on
the clutch disc.
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING—CLUTCH SYSTEM
DIAGNOSIS
Clutch problem diagnosis will generally require a
road test to determine the type of fault. Component
inspection will then determine the problem after road
testing.
Drive the vehicle at normal speeds during road
test. Shift the transaxle through all gear ranges and
observe clutch action. If chatter, grab, slip, or
improper release is experienced, remove and inspect
the clutch components. If the problem is noise or
hard shifting, further diagnosis may be needed. The
transaxle or other driveline components may actually
be at fault.
2.0/2.4L - Correct leak and replace modular
clutch assembly.
1.6L/Diesel/Turbo - Clean pressure plate,
flywheel, and replace clutch disc.
Apply lighter coating of grease to splines.
Further diagnosis required. Check
engine/transmission mounts, suspension
attaching parts and other driveline
components as needed.
Check EFI and ignition systems.
Replace clutch assembly.
Replace clutch assembly.
2.0/2.4L and Turbo - Verify modular clutch
pilot plate alignment to crankshaft. Replace
the modular clutch assembly if the pilot
plate is loose or bent.
1.6L and Diesel - Check alignment and
runout of flywheel, disc, or cover. Check
clutch housing to engine dowels and dowel
holes for damage. Correct as necessary.
CLUTCH
CORRECTION
6 - 3