18 · Diagnostics

S24 Gearbox noise cornering

Fault diagnosisS24 Gearbox noise cornering

Whilst driving, there is a cyclical or whistling noise in a specific gear. This noise decreases or disappears on changing gear

Step	Test procedure	Result	Action
0	FIRST CHECK Whilst driving, steer to the right or the left and check the onset of the noise. Check whether the intensity increases with the steering angle.	OK	Move onto step 1
		Rolling noise which varies with the steering angle both to the left and the right	Replace the wheel hub bearings End of diagnosis
		Increasing the steering angle produces a noise similar to croaking which varies according to the wheel speed	Move onto step 2
1	DIFFERENTIAL CHECK Check the differential: In particular, check the bearings	OK	Move onto step 2
		Bearings damaged	Replace the bearings Op. 2110D26 End of diagnosis
		Internal gears worn or damaged	Overhaul or replace the differential housing Op. 2110D10 End of diagnosis
2	WHEEL SIDE CONSTANT VELOCITY JOINT CHECK Check the wheel side constant velocity joints	OK	Move onto step 3
2		Wheel side joint damaged	Replace the wheel side joint Op. 2710A20 End of diagnosis
3	CORRECT OPERATION CHECK Check that the fault is no longer present	OK	Incorrect selection of diagnostic procedure
3		Fault persists	Incorrect selection of diagnostic procedure

Parts & tools for this job For 2000 Alfa Romeo 147

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