The following malfunctions may occur due to improper use of the clutch pedal (constant contact of the driver's foot with the clutch pedal when driving a car, a sharp release of the pedal or its incomplete «squeezing»), long-term operation of the vehicle with impaired pedal travel or natural wear and tear of parts or their damage during many years of operation of the vehicle. In the latter case, the clutch must be repaired at a service station.
Incomplete clutch disengagement (clutch «leads»)
With this malfunction, it is difficult to shift forward gears, and the reverse gear is engaged with noise. Causes of the malfunction and how to fix it:
- large free play of the clutch fork lever due to an increase in the gap between the clutch release bearing and the pressure spring petals (at clutch with servo mechanism). This leads to an increase in the free play of the clutch pedal (clutch fork lever) and a reduction in work travel. Therefore, the complete separation of the clutch discs does not occur. This cause of the malfunction is eliminated by adjusting the free play of the clutch fork lever, as indicated above;
- disc warping. This malfunction occurs when the clutch discs overheat due to slipping. The end runout of the driven disk should not exceed 0.5 mm. If the runout is greater, the disc should be straightened or replaced. If the pressure plate warps, it is replaced complete with the clutch cover and pressure spring;
- jamming of the hub of the driven disk on the splines of the input shaft. This malfunction may occur after prolonged or improper use of the vehicle due to contamination or wear of the splines. In the first case, it is enough to clean the splines of the shaft and hubs and cover them with LSTs-15 or Litol-24 grease, in the second case, replace worn parts;
- loosening of rivets or breakage of friction linings. It is necessary to rivet the friction linings using steel rivets. After flaring, the rivets should not have gaps. The distance from the rivet to the surface of the friction lining must be at least 0.2 mm;
- insufficient clutch pedal travel. This malfunction occurs due to incorrect adjustment of the backlash-free drive, when there is not enough pedal travel to completely separate the clutch discs. To eliminate the malfunction, it is necessary to correctly adjust the pedal travel within 125... 130 mm;
- malfunction of the clutch cable due to damage to the cable or its sheath or other causes that cause the clutch actuator to seize. It is necessary to determine the cause of the malfunction and replace damaged or worn parts.
Incomplete engagement of the clutch (clutch «slips»)
Symptoms of this problem:
- insufficient acceleration of the car when you sharply press the throttle pedal, there is a loss of power when driving uphill, fuel consumption increases, the engine overheats, there is a specific smell from burning the lining of the driven disk. Causes of the malfunction and how to eliminate it: there is no free play of the clutch fork lever. In this case, a constant effect of the clutch release bearing on the petals of the pressure spring c is possible. force at which the driven disk will not be clamped with sufficient force, which will lead to its slipping. This cause of the malfunction is eliminated by adjusting the free play of the clutch fork lever, as indicated above;
- worn or burnt friction linings. In this case, it is necessary to rivet or replace the driven disk;
- clutch discs are oiled. This is possible when the gearbox oil seals are worn. To replace them, contact a service station, as this involves a complete disassembly of the gearbox;
- jamming in the clutch release actuator. This is possible if the cable or its sheath is damaged (fractures, chafing) and is eliminated. Replacing the cable with subsequent adjustment of the clutch drive.
Increased noise when disengaging the clutch
Causes of the malfunction and how to eliminate them:
- wear, damage to the clutch release bearing or leakage of lubricant from it. The malfunction is eliminated by replacing the bearing and other damaged parts.
Jerks during clutch operation
Causes of malfunction:
- driven disc hub seizing on transmission input shaft splines, disc oiling, clutch actuation seizing, pressure plate surface damage or warping.
The troubleshooting steps for this issue are listed above.