Worn Splines Related Symptom: Harsh engagement, chatter. Cause: Worn pilot bearing, worn input shaft, misalignment between the engine and transmission. Check for misalignment on high-mileage vehicles and those in which the engine or transmission was replaced.
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	Broken Cover Plate Related Symptom: No release. Cause: Driver abuse over-torquing the disc, lugging the engine, high RPM engagement, harsh downshifting, vehicle suspension or engine modifications.
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	Worn Grooves Related Symptoms: Slipping, chatter. Cause: Excessive bearing preload caused by riding the clutch, incorrect release system adjustment, defective hydraulic release system.
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	Broken Torsion Damper Related Symptoms: Harsh engagement, no release. Cause: High RPM engagement abusing the torsion damper and causing the springs to fracture and dislodge from the retainer plate. A no-release condition will result if the springs lodge in other clutch system components.
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	Worn Stop Pins Related Symptom: Chatter. Cause: Driving in high gear at low RPMs, causing the disc torsion damper to contact the stop pins, high RPM engagement, excessive vehicle loading.
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	Worn Bearing Retainer Related Symptoms: Hard pedal, incomplete release. Cause: Incorrect release system adjustment, worn fork or fork pivot points, insufficient lubrication of the bearing retainer, worn ball stud causing the fork to apply uneven pressure to the release bearing. For the clutch to function properly, the bearing retainer must have a smooth surface and be exactly parallel to the input shaft.
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	Embedded Friction Material Related Symptoms: No release or engagement. Cause: Harsh downshifting, high RPM engagement, engine over-revving caused by missing a gear. The disc friction material burst when the clutch was disengaged, lodging friction material between clutch system component parts.
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	Melted Fingers Related Symptoms: No release, extreme noise, slipping. Cause: Worn bearing retainer, incorrect release bearing installation, worn or bent fork. The release bearing seized and stopped rotating. The contact marks on the diaphragm fingers were caused by abrasion and heat from constant contact with the bearing. The release bearing would be melted, blue and/or destroyed.
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