939009654 - 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.
Results of the tests
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 level    Op. 0010T41 MANUAL GEARBOX OIL CHECK LEVEL AND TOP UP IF NECESSARY Move on to Step 1Oil leak detected from the gearboxProceed as instructed in the    See table X15 GEARBOX/DIFFERENTIAL OIL LEAKS
The noise disappears or decreases considerably with the clutch pedal pressed: the noise comes from inside the gearboxProceed as instructed in the    See table S015 NOISE WHILST DRIVING
Oil level too low.Restore the correct level    Op. 0010T41 MANUAL GEARBOX OIL CHECK LEVEL AND TOP UP IF NECESSARY and carry out a road test. 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 2Gearbox main shaft hub faultyReplace the gearbox main shaft    Op. 2110B MANUAL GEARBOX WITH DIFFERENTIAL GEARS AND SYNCHRONISERS
Clutch plate hub bushes faulty.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 diagnosisClutch plate or pressure plate faultyReplace the clutch plate    Op. 1810A20 CLUTCH - R + R
Presence of oil or grease.Also replace the gearbox input oil sealOp. 2110C22 GEAR INPUT SHAFT SEALS - R R