Clutch Judder Definition: Clutch judder is caused by the clutch components and the flywheel not meeting concentrically or mating properly. This generally happens after the vehicle has come to a complete stop and the clutch is re-engaging. The physical juddering is the clutch irregularly gripping and slipping as the pedal is let out.  


Potential causes of clutch judder related to installation/modification: 

  1. Clutch linkage is worn or damaged  
  2. Improperly tuned engine 
  3. Improper gear ratio for the tire diameter 
  4. Excessive driveline angle 
  5. Excessive backlash in the differential 
  6. Worn or damaged engine mounts or transmission mounts 
  7. Worn or misaligned u-joints in the driveshaft  
  8. Damaged or excessively worn CV joints 
  9. Bad leaf springs, bushings, or mounts 

 

Potential causes of clutch judder related to the operation, 

  1. Improper break-in procedure resulting in the disc becoming deformed  
  2. Clutch disc friction material contaminated during install 
  3. The clutch disc is bent 
  4. Flywheel has an incorrect step  
  5. Flywheel friction surface is not parallel with the crank flange surface 
  6. Flywheel was not properly resurfaced before the new clutch installed  
  7. Flywheel has an improper surface finish 
  8. Flywheel has severe hard spots or hot spots  
  9. Pressure plate or clutch disc is defective  

 

If you have any questions about clutch judder, please contact us at tech@competitionclutch.com or call us at 1 (800) 809-6598. You can also reach us by submitting a ticket to our web portal at https://support.competitionclutch.com/support/login.