Table 1. Possible clutch malfunctions, their causes and methods of elimination
| Cause of malfunction | Method of elimination |
| Incomplete disengagement of the clutch (clutch "leads") | |
| Reduced full travel of clutch pedal | Repair the clutch release drive |
| Warping of the driven disk (end runout more than 0.5 mm) | Straighten the disk or replace it with a new one |
| Irregularities on the surfaces of the friction linings of the driven disk | Replace the linings or the driven disc assembly |
| Loose rivets or broken friction linings of the driven disk | Replace the linings, check the disc axial runout |
| Seizure of the driven disk hub on the splines of the gearbox input shaft | Clean the splines, coat with LSC-15 grease. If the cause of the jamming is the crushing or wear of the splines, then replace the primary shaft or driven disk |
| Air in the hydraulic drive system | Pump up the system |
| Fluid leak from the clutch release master or slave cylinder | Replace the master or slave cylinder |
| Loosening the rivets securing the pressure spring | Replace the clutch housing with pressure plate assembly |
| Misalignment or warping of the pressure plate | Same |
| Incomplete clutch engagement (clutch "slips") | |
| Increased wear or burning of the friction linings of the driven disk | Replace the friction linings or the driven disc assembly |
| Oiling of the friction linings of the driven disk, flywheel surfaces and pressure plate | Thoroughly wash the oily surfaces with white spirit, eliminate the causes of oiling of the discs |
| Damage or sticking of the clutch release drive | Eliminate the problems that cause sticking |
| Jerks when engaging the clutch | |
| The driven disk hub is jammed on the splines of the primary shaft | Clean the splines, lubricate with LSC-15 grease. If the cause of the jamming is the crushing or wear of the splines, then replace the primary shaft or driven disk if necessary |
| Breakdown or loss of elasticity of the driven disk damper springs | Replace the slave disk assembly |
| Oiling of the friction linings of the driven disk, flywheel surfaces and pressure plate | Thoroughly wash the oily surfaces with white spirit and eliminate the cause of the oily discs |
| Clutch release mechanism jamming | Replace deformed parts. Eliminate the 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 damaged |
| Loosening of the rivets of the friction linings of the driven disk | Replace faulty rivets and, if necessary, linings |
| Damage to the surface or warping of the pressure plate | Replace the clutch housing with pressure plate assembly |
| Increased noise when disengaging the clutch | |
| Clutch release bearing worn, damaged or leaking grease | Replace the bearing |
| Increased noise when engaging the clutch | |
| Breakage of the plates connecting the pressure plate to the casing | Replace the clutch housing with pressure plate assembly |
Visitor comments