16 · Diagnostics

S22 Gearbox noise in neutral

Make: Alfa Romeo
Model: 156 Factory Service Manual
Year: 1997–2002
Section: Noise/vibrations › S22 Gearbox noise in neutral

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Fault diagnosisS22 Gearbox noise in neutral

S22 Gearbox noise in neutral

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

Step	Test procedure	Result	Action
0	PRELIMINARY CHECKS Visually inspect whether the fault is accompanied by an oil leak from the gearbox / differential Press the clutch pedal and check whether the noise increases Check the gearbox / differential oil level Op. 2110A04	OK	Move onto step 1
		Oil leaks from the gearbox	Move onto step (see X15)
		With the clutch pressed, the noise disappears or decreases considerably	The noise is coming from inside the gearbox: Move onto step (see S20)
		Oil level too low	Restore the correct level and carry out a road test. If the defect persists, Move onto step 1
1	CHECK SPLINED HUB Check for excess grease on the clutch plate hub bushes and the gearbox main shaft	OK	Move onto step 2
		Gearbox main shaft hub faulty	Replace the gearbox main shaft (see OVERHAULING GEARBOXES Assembly 2110B) End of diagnosis
		Clutch plate hub bushes faulty	Restore the correct lubrication for the bushes If necessary, replace the clutch plate Op. 1810A20 End of diagnosis
2	CLUTCH PLATE CHECK 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	OK	Move onto step 3
		Clutch plate or pressure plate faulty	Replace the clutch plate Op. 1810A20 End of diagnosis
		Presence of oil or grease	Also replace the gearbox input oil seal Op. 2110C22 End of diagnosis
3	CHECK CORRECT OPERATION Check that the fault is no longer present	OK	End of diagnosis
3		Fault persists	Incorrect selection of diagnostic procedure

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Parts & tools for this job For 1997 Alfa Romeo 156

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