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How to Diagnose Clutch Slippage Faults?

2 Answers

LawsonAnn

07/25/25 10:20am

Here are the symptoms of clutch slippage: 1. When starting the car, fully releasing the clutch pedal does not allow the car to start or makes starting difficult. 2. During acceleration, the vehicle speed does not increase with the rise in engine RPM, and the engine's power is not fully transmitted to the drive wheels, resulting in weak driving performance. 3. When fully loaded or going uphill, slippage becomes more noticeable, and in severe cases, a burnt smell from overheated friction linings may be emitted. Here are the possible causes of clutch slippage: 1. The clutch pedal free play is too small or nonexistent, causing the release bearing to constantly press against the diaphragm spring, keeping the pressure plate in a semi-engaged state. 2. Reduced elasticity of the diaphragm spring. 3. Excessive wear of the friction disc leading to thinning, surface hardening, oil contamination, or exposed rivets. 4. Loose connecting bolts between the clutch and flywheel. 5. Improper adjustment of the release levers.

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McRiver

08/11/25 7:39pm

Last time when I was driving a manual transmission car uphill, I noticed the engine was roaring loudly when I pressed the accelerator, but the car was moving very slowly. I knew right away the clutch must be slipping. Even during normal driving, I could feel that when starting in gear, the RPM would shoot up high but the acceleration was particularly sluggish. If cars behind me honk aggressively at a traffic light start, it's almost certainly because the clutch disc is worn thin. Once when I was fully loaded and climbing a steep hill, I even smelled a burning odor, which scared me into pulling over immediately. The most direct test method is to pull the handbrake, engage third gear, and slowly release the clutch—under normal circumstances, the engine should stall immediately. If the RPM drops but the engine keeps sputtering without stalling, it's a sure sign of clutch slippage. In such cases, don't push your luck; getting it repaired promptly is the right thing to do.

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