		Test results
1	SYNCHRONIZER RING CHECK	All OK	Problems encountered	Operation
	Overhaul the gearbox Op. 2110B34 MANUAL GEARBOX (6 SPEED) WITH DIFFERENTIAL - DISMANTLING AND REASSEMBLY - WASH, CHECK COMPONENTS, REPLACE SYNCHRONIZERS AND INTERNAL CONTROLS In particular, check the synchronizer rings of the gear engaged: there should be no wear on the inner surfaces	Move on to Step 2	Seals worn	Replace the synchronizers Op. 2110B34 MANUAL GEARBOX (6 SPEED) WITH DIFFERENTIAL - DISMANTLING AND REASSEMBLY - WASH, CHECK COMPONENTS, REPLACE SYNCHRONIZERS AND INTERNAL CONTROLS
2	GEAR CHECK	All OK	Problems encountered	Operation
	Overhaul the gearbox Op. 2110B34 MANUAL GEARBOX (6 SPEED) WITH DIFFERENTIAL - DISMANTLING AND REASSEMBLY - WASH, CHECK COMPONENTS, REPLACE SYNCHRONIZERS AND INTERNAL CONTROLS In particular, check the teeth of the gear engaged: there should be no signs of wear or seizing	Move on to Step 3	Gears worn	Replace the gears involved Op. 2110B34 MANUAL GEARBOX (6 SPEED) WITH DIFFERENTIAL - DISMANTLING AND REASSEMBLY - WASH, CHECK COMPONENTS, REPLACE SYNCHRONIZERS AND INTERNAL CONTROLS
3	REDUCTION GEAR CHECK	All OK	Problems encountered	Operation
	Check the cylindrical reduction gear set Specifically: - it should not be worn or damaged; - there should not be excessive clearance	End of diagnosis	Reduction gear damaged	Restore the clearance or, if necessary, replace the reduction 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