125000512 - E03 CLUTCH VIBRATING OR JERKING

Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
Set off from a standstill releasing the clutch gradually, and check whether acceleration is jerky (discontinuous advancement).Drive the car at constant speed (equal to about 1000 rpm in 4th gear) and, with the clutch pedal release, accelerate rapidly, pressing the accelerator to the floor instantly.Check whether advancement is discontinuous (jerky).Continue to Step 1Advancement is discontinuous (jerky)Check the engine and/or fuel injection mountings
1CHECK ON CLUTCH LEVER TRAVELAll OKProblems metOperation
Check, in the engine compartment, that when the clutch pedal is pressed, the clutch control lever on the gearbox carries out its correct travel.Continue to Step 3Incomplete travel of clutch lever on gearboxContinue to Step 2
2CHECK ON CLUTCH PEDALAll OKProblems metOperation
After disconnecting the clutch pedal from the transmission , check that it travels freely without tight spots or stiffnessContinue to Step 3Play or stiffness on clutch pedalReplace the pedal Op.    Op. 3330B26 CLUTCH PEDAL - R+R
3CHECK ON CLUTCH RELEASE LEVER AND BEARING (WITH GEARBOX REMOVED)All OKProblems metOperation
After removing the gearbox, check that the lever is not stiff (because of dirty or insufficient lubrication) and that the clutch release bearing runs freely in its seating and shows no signs of damageContinue to Step 4The presence of dirt or wear because of insufficient lubrication will not allow the clutch release bearing to slide properlyReplace the faulty or damaged parts
4CHECK ON CLUTCH ASSEMBLYAll OKProblems metOperation
Visual check on the condition of the clutch assembly, on which there should be no breaks (pressure plate) and/or obvious damage (driven plate) Measurements using the gauge as per manualContinue to Step 5Obvious damage of clutch disc and/or breakage of pressure plateReplace the assembly Op.    Op. 1810A24 CLUTCH - R + R WITH GEARBOX REMOVED
5CHECK ON SPLINED CLUTCH HUBAll OKProblems metOperation

Check, in order:

  • that there is not excessive grease on the bushes of the clutch disc hub and gearbox main shaft;
  • condition of hub and main shaft
Continue to Step 6Main shaft damaged, hub worn, excessive grease on bushesReplace hub and/or main shaft
6FLYWHEEL CONDITION CHECKAll OKProblems metOperation

Check the condition of the flywheel. In particular, check:

  • condition of surface
  • wear
  • chips
  • signs of overheating;
Continue to Step 7Flywheel damagedReplace the flywheel Op.    Op. 1024B10 ENGINE FLYWHEEL - R + R FOR VERSIONS WITH MANUAL GEARBOX
7CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosis.