Sometimes the defect can be identified by the specific smell emitted by burnt friction linings. There is another old method for identifying clutch slippage. To do this, with the engine running, tighten the parking brake all the way, press (turn off) the clutch pedal, smoothly press the gas pedal and slowly release the clutch pedal. If the engine stalls with the clutch pedal fully released and the gas pedal fully pressed, then the clutch is normal. When the clutch slips, the engine continues to run despite all manipulations with the pedals. What are the initial causes of incomplete clutch engagement?
1. There is no or very little free travel of the clutch pedal.
2. The friction linings of the driven disk are worn out or burnt out. Usually worn disks are replaced with new ones, but this is not necessary. If the disk is in good condition except for the worn friction linings, they can be replaced. To do this job, new friction linings and rivets are needed. Those who will replace the linings (Fig. 54) need to know the following:
- the lining is considered completely worn out if the distance between the rivet and the working surface of the lining is less than 0.2 mm;
- the pads must be replaced if cracks appear on their surface;
- flared rivets must not have any breaks;
- the runout of the working surface of the friction linings should not exceed 0.5 mm.
3. The friction linings of the driven disk, the surfaces of the flywheel and the pressure plate are oiled. Naturally, in this case, first of all, it is necessary to find out where the grease came from, and only after detecting and eliminating the penetration of grease, disassemble the clutch and thoroughly wash the oiled parts in gasoline, wipe dry and lightly clean the linings with sandpaper.
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4. The rubber parts of the clutch master and slave cylinders have swollen and blocked the compensation hole due to mineral oil, gasoline or kerosene entering the hydraulic system.