| | Test results |
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| Visually inspect whether the problem is accompanied by an oil leak from the gearbox/differential.Press the clutch pedal and check whether the noise increases.Check the gearbox/differential oil level | Move on to Step 1 | 1. Oil leak detected from the gearbox2. The noise disappears or decreases considerably with the clutch pedal pressed: the noise comes from inside the gearbox3. Oil level too low | 1. Proceed as instructed See table X015 GEARBOX/DIFFERENTIAL OIL LEAKS2. Proceed as instructed See table S015 NOISE WHILST DRIVING3. Restore the correct level and carry out a road test Op. 0010T40 CHANGE MANUAL GEARBOX OIL If the fault persists, move on to Step 1 |
| 1 | SPLINED HUB CHECK | All OK | Problems encountered | Operation |
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| Check for excess grease on the clutch plate hub bushes and the gearbox main shaft | Move on to Step 2 | 1. Gearbox main shaft hub faulty2. Clutch plate hub bushes faulty | 1. Replace the gearbox main shaft2. Restore the correct lubrication for the bushes. If necessary, replace the clutch plate Op. 1810A20 CLUTCH - R + R |
| 2 | CLUTCH PLATE CHECK | All OK | Problems encountered | Operation |
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| Check:- Clutch plate wear;- Fouling (oil or grease) of the clutch plate;- That there is no distortion of the clutch plate;- That there is no damage to the pressure plate diaphragm spring. | End of diagnosis | 1. Clutch plate or pressure plate faulty2. Presence of oil or grease | 1. Replace the clutch plate Op. 1810A20 CLUTCH - R + R 2. Also replace the gearbox input oil seal |
