Clutch Diagnosis - PowerPoint PPT Presentation

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Title:

Clutch Diagnosis

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Clutch Diagnosis Possible Problems Slipping Chatter No release Excessive effort Insufficient pedal travel Excessive pedal travel Harsh engagement Noise Slipping ... – PowerPoint PPT presentation

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Title: Clutch Diagnosis


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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