Diagnosis and troubleshooting of clutch problems (Mercedes-Benz E-Class W124)

The clutch pedal is easy to press or sinks

• Low fluid level in the clutch hydraulic system.
• Damage to the release bearing or clutch release fork.
• The diaphragm spring of the clutch pressure plate is damaged.

Incomplete clutch disengagement (clutch leads)

• The fluid level in the clutch hydraulic system is too high.
• The driven clutch disc is seized on the splines of the primary shaft.
• Warping of the clutch disc.
• The pressure plate assembly is not assembled correctly.
• The clutch release mechanism is worn out or improperly assembled.

Incomplete clutch engagement (the clutch is slipping)

• The wear of the clutch disc linings is below the permissible limit.
• Clutch disc linings contaminated with oil or lubricant.
• The pressure plate is faulty or the diaphragm spring is weak.

Jerks when engaging the clutch

• The wear of the clutch disc linings is below the permissible limit.
• Clutch disc linings contaminated with oil or lubricant.
• The pressure plate or diaphragm spring is deformed.
• The gearbox mounts to the engine are loose.
• The clutch disc hub or gearbox input shaft splines are worn out.

Noise when pressing or releasing the clutch pedal

• The release bearing is worn out.
• Clutch pedal bushings are worn or lack lubrication.
• The pressure plate assembly is faulty.
• Damage to the diaphragm spring of the pressure plate.
• Damage to the damping springs in the clutch disc.