Checking the technical condition of the clutch

Check the technical condition of the clutch in the following ways

1. Engage neutral gear in the gearbox, start the car engine and warm it up to operating temperature.

When the engine is running at minimum engine speed, disengage the clutch (depress the pedal) and engage reverse gear.

The transmission should turn on without grinding, knocking or other extraneous noise.

2. Change gears while driving. All gears must be engaged without grinding, knocking or other extraneous noise.

3. When accelerating the car, proportionality should be observed between an increase in the engine speed and an increase in the speed of the car (the clutch should not “slip”). Clutch slip is easy to determine with a tachometer.

If, while driving, with a sharp press on the accelerator pedal, the speed rises sharply, and then drops slightly and the car starts to accelerate, the clutch needs repair.

If these signs of normal clutch operation are absent, try to remove air from the clutch hydraulic actuator.

If bleeding the hydraulic drive does not lead to the desired result, remove the clutch for repair.

Fault (Troubleshooting)

Clutch slips (does not fully engage)When you press the accelerator pedal hard, the engine picks up speed, but the car hardly accelerates (this is especially noticeable when driving uphill); the smell of overheated friction linings can be felt; fuel consumption increases:

  • - Oiling the flywheel, pressure plate, friction linings of the driven disk (Remove the cause of oiling, oil leakage through the cuffs of the engine or gearbox)

Rinse oily surfaces thoroughly with mineral spirits or gasoline and wipe them dry. Replace heavily oiled driven disc

  • - Worn or burnt friction linings of driven disc (Replace driven disc assembly)
  • - Decreased force of diaphragm spring / pressure springs (Replace pressure plate, springs)
  • - The master cylinder piston slowly returns to its original position due to cuff swelling or clogging of the compensation hole (Replace cuffs or cylinder assembly)

Clean the compensation holes. Replace the brake fluid if gasoline or other solvents are suspected.

Clutch engages (does not fully disengage)Difficult to change forward gears, reverse gear engages noisily. Gearbox OK:

  • - Incorrect adjustment of the clutch drive (too little pedal travel) (Adjust the drive, replace the deformed clutch fork)
  • - Air has entered the hydraulic drive system (Bleed the system, tighten the connections)
  • - Loose rivets or broken friction linings, buckling of the driven disk (end runout more than 0.5mm) (Replace the disk)
  • - Uneven wear, scoring on the working surfaces of the flywheel or pressure plate (Turn or replace the flywheel with subsequent balancing)

If the surface of the pressure plate is damaged, replace the cover with the pressure plate assembly.

  • - Jamming of the driven disk hub on the splines of the input shaft of the gearbox (Clean the splines from dirt and corrosion, eliminate minor damage with a file)

If the splines are severely worn or damaged, replace the disc or the transmission input shaft. Before assembly, apply SHRUS-4 lubricant to the splines

  • - Jammed release bearing (Replace bearing)
  • - Warped or warped pressure plate (Replace pressure plate housing assembly)
  • - Diaphragm spring petals do not lie in the same plane (Individual diaphragm spring petals are allowed to protrude by no more than 0.25mm) Replace casing with pressure plate assembly (clutch basket)
  • - The release levers are misaligned, their paws do not lie in the same plane (Adjust the position of the levers or replace them as an assembly with fingers and bearings)

Clutch won't disengage(pedal drops):

  • - Deformed or broken clutch fork (Replace fork)
  • - Air in the hydraulic drive system (Bleed the system, tighten the connections)

The clutch does not disengage (the pedal fails), It is only possible to briefly engage the clutch by pressing the pedal sharply:

  • - Wear defects of the master cylinder mirror, dirt in the cylinder (Clean or replace the cylinder, replace the cylinder cuffs when disassembling)
  • - Worn or defective seals (Replace cylinder seals)

Jerkswhen touching:

  • - Jamming of the hub of the driven disk on the splines of the input shaft of the gearbox (Clean the splines, eliminate minor damage with a needle file) If the splines are significantly damaged, replace the disk.
  • - Deformation of the driven disk (Replace disk)
  • - Loose friction linings of the driven disc, wear or cracks on the linings (Replace the driven disc)

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