Tab. 1. Possible clutch malfunctions, their causes and solutions
Cause of malfunction | Remedy |
Incomplete clutch disengagement (clutch «leads») | |
Reduced clutch pedal travel | Repair the clutch release actuator |
Warping of the driven disk (end runout more than 0.5 mm) | Straighten the disc or replace with a new one |
Irregularities on the surfaces of the friction linings of the driven disk | Replace pads or driven disc assembly |
Loose rivets or broken disc friction linings | Replace the pads, check the end runout of the disc |
Jamming of the hub of the driven disk on the splines of the input shaft of the gearbox | Clean the splines, coat with LSTs-15 grease. If jamming is caused by crushing or worn splines, then replace the input shaft or driven disk |
Air in the hydraulic drive system | Bleed the system |
Fluid leakage from the master or slave cylinder of the clutch release actuator | Replace Master or Slave Cylinder |
Loosening the compression spring fastening rivets | Replace clutch cover with pressure plate assembly |
Skewed or warped pressure plate | Same |
Incomplete engagement of the clutch (clutch «slips») | |
Increased wear or burning of the friction linings of the driven disk | Replace friction linings or driven disc assembly |
Lubrication of the friction linings of the driven disk, flywheel and pressure disk surfaces | Thoroughly rinse oiled surfaces with white spirit, eliminate the causes of oiling discs |
Damaged or stuck clutch release actuator | Troubleshoot causing jams |
Jerks during clutch operation | |
Jamming of the hub of the driven disk on the splines of the input shaft | Clean the splines, lubricate with LSTs-15 grease. If jamming is caused by crushing or worn splines, replace the input shaft or driven disk if necessary |
Breakage or reduction of elasticity of springs of a damper of a conducted disk | Replace driven disc assembly |
Lubrication of the friction linings of the driven disk, flywheel and pressure disk surfaces | Thoroughly rinse the oiled surfaces with white spirit and eliminate the cause of the oiling of the discs |
Seizure in the clutch release mechanism | Replace deformed parts. Eliminate causes of jamming |
Increased wear of the friction linings of the driven disk | Replace the pads with new ones, check if the disc surfaces are not damaged |
Loosening the rivets of the friction linings of the driven disk | Replace faulty rivets and, if necessary, linings |
Surface damage or buckling of the pressure plate | Replace clutch cover with pressure plate assembly |
Increased noise when disengaging the clutch | |
Worn, damaged or leaking lubricant from the clutch release bearing | Replace bearing |
Increased noise when engaging the clutch | |
Breakage of the plates connecting the pressure plate to the casing | Replace clutch cover with pressure plate assembly |
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