3308718 - S23 NOISE' GEARBOX / IN A SPECIFIC GEAR
With the engine running, a noise is heard (whilsting inside the gearbox) when a specific gear is engagedThis noise decreases or disappears on changing gear.| Results of the tests | ||||
| 1 | CHECK ON SYNCHRONIZER RINGS | All OK | Problems met | Operation |
|---|---|---|---|---|
| Overhaul the gearbox (see OVERHAULING GEARBOX Assembly 2110B).In particular, check the synchronizer rings for the gear involved: they should not show signs of wear on the inner surfaces | Continue to Step 2 | Seals worn | Replace the synchronizers | |
| 2 | CHECK GEARS | All OK | Problems met | Operation |
| Overhaul the gearbox (see OVERHAULING GEARBOX Assembly 2110B).In particular, check the teeth of the gear concerned: they should not be worn or show signs of seizing | Continue to Step 3 | Gears worn | Replace the gears involved | |
| 3 | CHECKING THE CROWNWHEEL AND PINION | All OK | Problems met | Operation |
| Check
the crown wheel and pinion reduction gear (see OVERHAULING GEARBOX
Assembly 2110D) In particular:
| Continue to Step 4 | Reduction gear damaged | Restore the clearance or, if necessary, replace the crownwheel and pinion | |
| 4 | HECK ON CORRECT OPERATION | All OK | Problems met | Operation |
| Check that the fault is no longer present | End of diagnosis | Fault persists | Search for the fault starting from another symptom' | |