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Clutch Diagnosis

Clutch Diagnosis. Possible Problems. Slipping Chatter No release Excessive effort Insufficient pedal travel Excessive pedal travel Harsh engagement Noise. Slipping. Possible causes Normal wear Oil contamination Weak pressure plate Overloading Misadjusted linkage Diagnosis

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Clutch Diagnosis

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  1. Clutch Diagnosis

  2. Possible Problems • Slipping • Chatter • No release • Excessive effort • Insufficient pedal travel • Excessive pedal travel • Harsh engagement • Noise

  3. Slipping • Possible causes • Normal wear • Oil contamination • Weak pressure plate • Overloading • Misadjusted linkage • Diagnosis • Lug the engine in high gear

  4. Chattering • Grabbing or jerking that occurs when starting out in low gear • Possible causes • Broken or deteriorated motor mounts • Broken or deteriorated rear axle control arm bushings • Burned or glazed clutch disc • Worn clutch hub splines • Warped pressure plate or flywheel • Collapsed Marcel springs

  5. No Release • Possible Causes • Improper linkage adjustment • Loose linkage • Binding between clutch disc hub and input shaft • Bent or warped clutch disc • Clutch disc installed backwards • Seized pilot bearing • Rusted clutch disc (long-term storage)

  6. Excessive Effort • Possible Cause • Binding linkage or cable • Obstructed or restricted hydraulic line • High performance pressure plate installed • Wrong release fork or linkage • Lack of leverage

  7. Insufficient Pedal Travel • Possible causes • Worn clutch • Misadjusted linkage

  8. Excessive Pedal Travel • Possible causes • Misadjusted Linkage • Improperly bled hydraulic system • Faulty master/slave cylinder

  9. Harsh Engagement • Possible Causes • Oil contamination • Flattened Marcel springs • Broken torsional dampening springs

  10. Noise • The key to diagnosing noises is to understand what is turning against what when • Example: • A worn pilot bearing should not make noise when the clutch is engages because the input shaft and the crankshaft are turning at the same speed in the same direction • Possible sources of noise • Pilot bearing • Throwout bearing • Input shaft bearing • Linkages • Release fork – pivot ball

  11. Noise Diagnosis

  12. Clutch Repair • Transmission must be removed to repair clutch • Bellhousing may be removable • Always resurface flywheel • May be stepped • Height of steps is important • Replace entire clutch assembly • Disc • Pressure plate • Pilot bearing • Throwout bearing

  13. Flywheel Resurfacing

  14. Flywheel Resurfacing

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