Chatter is grabbing or jerking during engagement. The most common cause is contamination of the disc friction material. Before removing the bell housing, inspect the area around it and the
engine to locate and repair the source of oil leaks.
Avoid contamination of disc friction material by touching it with clean hands only. Prior to installation, clean the
contact surfaces of the flywheel and the clutch pressure plate with an alcohol-based cleaner.
Lubricate input shaft splines with a small amount of high-temperature grease. Slide the disc onto the input shaft splines to distribute a thin film. Remove the disc and wipe away any excess
lubricant prior to installation.
Check the release system for wear and damage. Worn or distorted components prevent the clutch from clamping the disc evenly, causing chatter. Check the transmission and the engine mounts, and
examine the vehicle for damage that could contribute to vibration as the clutch is engaged.
Causes of Chatter
External
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Loose or broken engine or transmission mounts
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Misalignment of chassis and drive line components
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Worn or damaged universal or constant velocity joints
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Missing bell housing dowel pins
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Loose transmission cross member
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Loose rear leaf spring bushings or spring u-bolt nuts
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Worn or bent fork
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Internal
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Bent or broken drive straps
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Warped or grooved flywheel
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Missing flywheel dowel pins
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Wear or excessive lubrication of input shaft splines
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Worn pilot bearing/bushing
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Worn bearing retainer
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Worn or damaged disc splines
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Clutch distortion or bent drive straps
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Oil- or grease-contaminated friction material
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Improper bolting of the clutch
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