- Wear of the gearbox input shaft bearings (the noise appears when the clutch pedal is released and disappears when the pedal is pressed) (chapter 7A).*
- Clutch release bearing wear (noise when the clutch pedal is pressed, with a possible reduction when the pedal is released) (chapter 6).
Noise when engaging one of the gears
- Wear, damage or breakage of teeth in the gearbox (chapter 7A).*
Difficulty shifting gears
- Clutch failure (chapter 6).
- Worn or damaged shift linkage/cable (chapter 7A).
- Incorrect adjustment of the shift linkage/cable (chapter 7A).
- Synchronizer wear (chapter 7A).*
Spontaneous gear shifting
- Worn out damage to the gearshift lever/cable (chapter 7A).
- Incorrect adjustment of the shift linkage/cable (chapter 7A).
- Synchronizer wear (chapter 7A).*
- Wear of gear selection forks (chapter 7A).*
Vibration
- Lack of oil (chapter 7A).
- Bearing wear (chapter 7A).
Oil leak
- Transmission oil leak from differential output seal (chapter 7A).
- Leakage through the joints of the housing (chapter 7A).*
- Oil leak through the input shaft seal (chapter 7A).
* Although the above mentioned faults are beyond the capabilities of the car owner, the information provided should help you to identify their causes in order to clearly explain the situation to a professional auto mechanic.