323001375 - S023 GEARBOX NOISE - IN A SPECIFIC GEAR

With the engine running, there is a noise (whistling inside the gearbox) when a specific gear is engaged. This noise decreases or disappears on changing gear
Test results
1SYNCHRONIZER RING CHECKAll OKProblems encounteredOperation
Overhaul the gearbox    Op. 2110B20 MANUAL GEARBOX (5-6 SPEED) WITH DIFFERENTIAL - DISMANTLING AND REASSEMBLY - WASH AND CHECK PARTS - REPLACE SYNCHRONISERS AND INTERNAL CONTROLS IF NECESSARY In particular, check the synchronizer rings of the gear engaged: there should be no wear on the inner surfacesMove on to Step 2Seals wornReplace the synchronizers    Op. 2110B20 MANUAL GEARBOX (5-6 SPEED) WITH DIFFERENTIAL - DISMANTLING AND REASSEMBLY - WASH AND CHECK PARTS - REPLACE SYNCHRONISERS AND INTERNAL CONTROLS IF NECESSARY
2GEAR CHECKAll OKProblems encounteredOperation
Overhaul the gearbox    Op. 2110B20 MANUAL GEARBOX (5-6 SPEED) WITH DIFFERENTIAL - DISMANTLING AND REASSEMBLY - WASH AND CHECK PARTS - REPLACE SYNCHRONISERS AND INTERNAL CONTROLS IF NECESSARY In particular, check the teeth of the gear engaged: there should be no signs of wear or seizingMove on to Step 3Gears wornReplace the gears involved    Op. 2110B20 MANUAL GEARBOX (5-6 SPEED) WITH DIFFERENTIAL - DISMANTLING AND REASSEMBLY - WASH AND CHECK PARTS - REPLACE SYNCHRONISERS AND INTERNAL CONTROLS IF NECESSARY
3REDUCTION GEAR CHECKAll OKProblems encounteredOperation
Check the reduction gearSpecifically:- it should not be worn or damaged;- there should not be excessive clearanceEnd of diagnosisReduction gear damagedRestore the clearance or, if necessary, replace the reduction gear