312000175 - S022 GEARBOX NOISE - IN NEUTRAL

With the vehicle stationary, the gearbox in neutral and the engine running, there is a high frequency, low intensity noise coming from the area of the gearbox.
Test results
0PRELIMINARY CHECKSAll OKProblems encounteredOperation
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 levelMove on to Step 11. 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 low1. 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
1SPLINED HUB CHECKAll OKProblems encounteredOperation
Check for excess grease on the clutch plate hub bushes and the gearbox main shaftMove on to Step 21. Gearbox main shaft hub faulty2. Clutch plate hub bushes faulty1. Replace the gearbox main shaft2. Restore the correct lubrication for the bushes. If necessary, replace the clutch plate    Op. 1810A20 CLUTCH - R + R
2CLUTCH PLATE CHECKAll OKProblems encounteredOperation
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 diagnosis1. Clutch plate or pressure plate faulty2. Presence of oil or grease1. Replace the clutch plate    Op. 1810A20 CLUTCH - R + R 2. Also replace the gearbox input oil seal