S22 NOISE' GEARBOX / IN NEUTRAL - Alfa - 156 - eLearn

3233158 - S22 NOISE' GEARBOX / IN NEUTRAL

With the engine running and the gearbox in neutral, there is noise from the area of the gearbox

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	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 considerably	The noise is coming from inside the gearbox: See table S20
			Oil level too low	Restore the correct level and carry out a road test. If the defect persists, Continue to Step 1
1	CHECK SPLINED HUB	All OK	Problems met	Operation
	Check for excess grease on the clutch plate hub bushes and the gearbox main shaft	Continue to Step 2	Gearbox main shaft hub faulty	Replace the gearbox main shaft (see OVERHAULING GEARBOXES Assembly 2110B)
		Continue to Step 2	Clutch plate hub bushes faulty	Restore the correct lubrication for the bushes If necessary, replace the clutch plate Op. 1810A20
2	CLUTCH PLATE CHECK	All OK	Problems met	Operation
	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
		Continue to Step 3	Presence of oil or grease	Also replace the gearbox input oil seal Op. 2110C22
3	CHECK 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'