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Trouble Shooting Questions

  1. What could be the causes for clutch chatter?
  2. What could be the cause for improper clutch release?
  3. What are the possible causes for clutch slippage?

Q: What could be the causes for clutch chatter?

  • Flywheel has excessive run-out.
  • Fly wheel was not resurfaced before the new clutch was installed.
  • Flywheel was resurfaced improperly or has improper surface finish.
  • Flywheel has severe hard spots or hot spots.
  • Flywheel resurfaced improperly (i.e. incorrect flywheel step).
  • Damaged or excessively worn cv joints.
  • Bad u-joints in drive shaft or u-joints misaligned.
  • Excessive backlash in differential.
  • Excessive driveline angle.
  • Bad leaf springs, bushings or mounts.
  • Improper gear ratio versus tire diameter.
  • Defective pressure plate and/or disc.
  • Disc has inadequate or no marcel (not enough cushion between the friction facings).
  • Oil or grease contamination on clutch facings.
  • Worn or damaged clutch linkage.
  • Bent cover assembly and/or disc.
  • Improperly tuned engine.
  • Worn or damaged engine mounts or transmission mounts.

Q: What could be the cause for improper clutch release?

  • Clutch linkage not properly adjusted or reset
  • Flywheel not surfaced before new clutch installed.
  • Flywheel surfaced improperly (i.e. incorrect flywheel step).
  • Flywheel machined too thin or not manufactured to stock (O.E.M.) specifications.
  • Linkage worn or damaged.
  • Defective hydraulics, leaking, burnt fluid, or there may be air in the system.
  • Cable stretched or damaged.
  • Improper clutch fork geometry due to flywheel being too thin or bellhousing deeper than stock (bellhousing ball stud may not be adjusted properly).
  • Pilot bushing binding due to improper bellhousing alignment, bellhousing damaged, or loose.
  • Clutch disc installed improperly.
  • Clutch disc hub rubbing against flywheel bolts.
  • Clutch disc binding on input shaft.
  • Input shaft bent causing clutch disc runout.
  • Pressure plate assembly and/or clutch disc bent or damaged.
  • Clutch disc is too thick/ or has excessive marcel (too much cushion between the friction facings).
  • Pressure plate has defective or damaged torque drive straps.
  • Damaged, worn, or improperly installed pilot bushing/bearing.
  • Oil or grease contamination on clutch facings.
  • Damaged or worn throwout bearing collar.

Q: What are the possible causes for clutch slippage?

  • Improper clutch adjustment freeplay.
  • Quadrant not reset properly or is faulty (on ratchet cable type linkage. systems).
  • Incorrect throwout bearing is being used (too long).
  • Clutch assembly contaminated with grease/oil.
  • Clutch not fully/properly seated in.
  • Flywheel not surfaced and disc has been glazed.
  • Clutch assembly not designed for the application.
  • Clutch assembly not designed for specific type of use (racing/competition, etc.).
  • Clutch not adequate for horsepower/torque of application.
  • Incorrect gear ratio to tire diameter.
  • Clutch assembly has lost facing material from the disc.
  • Clutch assembly has failed or is defective.
  • Flywheel surfaced improperly (i.e. incorrect flywheel step).
  • Damaged or worn throwout bearing collar.
  • Damaged or bent pressure plate assembly and/or disc.