Faulty suspension (mounts) vehicle or gearbox, or the mounting bolts are loose. It means. that the power unit begins to oscillate when the clutch is engaged.
Clutch disc linings are burnt or hardened, i.e. possible uneven friction between the clutch and the flywheel. If, for example, another vehicle is towed for a long distance, then this can happen, which at first will not be noticeable.
As a result, the pressure plate may be deformed due to strong heat generation, i.e. the friction surface is no longer perfectly smooth.
In all cases, the clutch and driven disc must be removed in order to pinpoint the cause of the failure.
If the clutch fails en route or the clutch no longer engages or disengages, the journey can still be continued to the nearest workshop or home. It is even possible to shift gears in ascending or descending order. If the clutch fails while the car is moving with the gear engaged, and the gear needs to be turned off, then you need to remove "gas" and shift the gearshift lever to the neutral position. If this fails, you can give a little "gas", until the lever is released. To drive without clutch, do the following:
Turn off the engine and engage first gear.
Turn on starter. The vehicle will start jerking until the engine speed increases. If the engine is cold, it must be preheated so that it does not stall immediately after starting. On a flat road, you can start from second gear and thus reach the nearest workshop.
If you want to shift into higher gear, you need to start moving in first gear, as described above, and accelerate the engine to about 1000 rpm. Let go a little "gas" and pull the gearshift lever to the neutral position. Now release the gas pedal completely and push the gearshift lever in the direction of the second gear position. If the engine and gearbox RPMs match, the gear will engage. If the interval between switching is too long, you need to give a little more "gas", to enable transmission. Upshifting should be carried out only at low speeds, i.e. shift into second gear at a speed of approximately 20 km/h, into third gear at approximately 25 km/h, and into fourth gear at 35 km/h. Fifth gear cannot be engaged.
When downshifting, the RPM must be increased so that the next gear can be engaged. Let go a little "gas", switch off the gear and carefully press the "gas". At the right time, push the gearshift lever to the next downshift position. At the correct engine speed, the gear will engage without delay. When downshifting, the vehicle speed must be reduced accordingly to keep the shifting process under control. When grinding, you need to control the switching process again. Thanks to the synchronizers, shifting with careful handling of the gearshift lever is easy and should not be too difficult.
It has been found that it takes a bit of practice to follow the instructions above for the process to go smoothly.
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