Noise in neutral position with engine running
- Wear of the input shaft gears and gearbox bearings (noise when the clutch pedal is deafened, not pressed) (Chapter 7A).*
- Clutch release bearing wear (noise when the clutch pedal is depressed, possibly weaker when released) (Chapter 6).
Noise when shifting into one of the gears
- Worn, damaged or broken gear teeth (Chapter 7A).*
Difficulty shifting gears
- Clutch failure (Chapter 6).
- Worn or damaged gear shift mechanism (Chapter 7A).
- Gearshift mechanism incorrectly adjusted (Chapter 7A).
- Synchronizer components worn out (Chapter 7A).*
Vibration
- Lack of oil (Chapter 1).
- Worn bearings (Chapter 7A).*
Spontaneous disengagement of gears
- Worn or damaged gear shift mechanism (Chapter 7A).
- Gearshift mechanism incorrectly adjusted (Chapter 7A).
- Synchronizer components worn out (Chapter 7A).*
- Gear shift forks worn out (Chapter 7A).*
Oil leaks
- Transmission oil leak from differential side seal (Chapter 7A).
- Leak from crankcase connection (Chapter 7A).*
- Oil leakage through the cuff of the input shaft (Chapter 7A).
* The repair of the components described above cannot be done in a garage, however, the above information should be useful in determining the cause of the malfunction so that the owner can competently consult a professional mechanic.