Clutch diagnostics
a) with the engine running and the brake applied, hold the clutch pedal 12.7 mm (1/2 in) off the floor and shift from 1st to 2nd gear and back several times. If the shifts are smooth, the clutch is OK. If not, it is not disengaging completely. Check the pedal, cable, lever, and thrust bearing.
b) another check involves having the engine idling with the gearbox in neutral (clutch pedal up - clutch engaged). Press the clutch pedal, wait a few seconds, engage the top gear. No noise should be heard. Cracking and noise in this case indicate a failure of the pressure plate or clutch disc (provided, of course, that the gearbox itself is in perfect order).
v) clutch pedal jamming is most often caused by a broken cable or exhaust insulation separating the shaft from the clutch. Lubricate the insulating sleeve with SAE 10W-30 engine oil. Check the place where the cable enters the housing - there may be rust or corrosion. If it looks normal, lubricate it with oil. If the pedal does not work again, the cable is worn out and needs to be replaced.