3233158 - S22 NOISE' GEARBOX / IN NEUTRAL

With the engine running and the gearbox in neutral, there is noise from the area of the gearbox
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
Visually inspect whether the fault is accompanied by an oil leak from the gearbox / differentialPress the clutch pedal and check whether the noise increases Check the gearbox / differential oil level Op.   2110A04  Continue to Step 1 Oil leaks from the gearbox See table   X15 
With the clutch pressed, the noise disappears or decreases considerablyThe noise is coming from inside the gearbox: See table   S20 
Oil level too lowRestore the correct level and carry out a road test. If the defect persists, Continue to Step 1
1CHECK SPLINED HUBAll OKProblems metOperation
Check for excess grease on the clutch plate hub bushes and the gearbox main shaft Continue to Step 2 Gearbox main shaft hub faultyReplace the gearbox main shaft (see OVERHAULING GEARBOXES Assembly 2110B)
Clutch plate hub bushes faultyRestore the correct lubrication for the bushes If necessary, replace the clutch plate Op.   1810A20 
2CLUTCH PLATE CHECKAll OKProblems metOperation

Check:

  • clutch plate wear
  • clutch plate fouling (oil or grease)
  • that the clutch plate is not distorted
  • that there is no damage to the pressure plate diaphragm spring
Continue to Step 3 Clutch plate or pressure plate faulty Replace the clutch plate Op.   1810A20 
Presence of oil or grease Also replace the gearbox input oil seal Op.   2110C22 
3CHECK CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persistsSearch for the fault starting from another symptom'