S22 NOISE' GEARBOX / IN NEUTRAL - Alfa - 147 - eLearn

3022727 - S22 NOISE' GEARBOX / IN NEUTRAL

With the vehicle stationary, the gear lever in neutral and the engine running, there is a high frequency, low intensity noise in the area of the gearbox. The fault is often accompanied by an oil leak from the gearbox: also see Table X15

0	FIRST CHECK	All OK	Problems met	Operation
		Results of the tests
	Press the clutch pedal and check whether the noise disappears or decreases	Continue to Step 1	Noise remains constant	Continue to Step 3
1	GEARBOX/DIFFERENTIAL FLUID LEVEL CHECK	All OK	Problems met	Operation
	Check the gearbox/differential fluid level Op. 2110A04	Continue to Step 2	Level too low	Restore the correct level and road test the vehicle.Continue to Step 3
2	GEARBOX BEARING CONDITIONS CHECK	All OK	Problems met	Operation
	Overhaul the gearbox Op. 2110B32 . In particular, check the gearbox bearings: they should not show signs of wear	Continue to Step 3	Bearings worn	Replace the bearings Op. 2110B32
3	CLUTCH PLATE CHECK	All OK	Problems met	Operation
	Verify: thrust bearing; clutch plate fouling (oil or grease); that the clutch plate is not distorted; that there is no damage to the pressure plate diaphragm spring; that there is no damage to the flexible coupling springs;	Continue to Step 4	Clutch disc or pressure plate faulty	Replace the clutch plate Op. 1810A20
		Continue to Step 4	Thrust bearing faulty	Replace the bearing Op. 1820A30
4	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'