16 · Diagnostics

S24 Gearbox noise cornering

Fault diagnosisS24 Gearbox noise cornering

Whilst driving round a bend (right or left) there is a noise from the area of the gaerbox.

Step	Test procedure	Result	Action
0	PRELIMINARY CHECKS Steer to the right or the left and check whether the noise increases. Steer on full lock and then release the steering wheel: check whether the intensity of the noise increases or decreases with the steering angle	OK	Move onto step 1
		The noise only increases when steering to the right or the left	Move onto step (see S40)
		The noise stops along a straight line	Move onto step (see S45)
		The noise level increases as the steering angle increases	Check the constant velocity joints: Move onto step 2
		The noise remains constant as the steering angle increases	Check the differential: Move onto step 1
1	DIFFERENTIAL CHECK Check the differential, in particular the bearings (see OVERHAULING GEARBOXES Assembly 2110D)	OK	Move onto step 3
		Bearings damaged	Replace the bearings End of diagnosis
		Gears worn or damaged	Overhaul or replace the differential housing End of diagnosis
2	CONSTANT VELOCITY JOINTS CHECK Check the transmission constant velocity joints	OK	Move onto step 3
2		Joint damaged	Replace the joint Op. 2710A20 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

Parts & tools for this job For 1997 Alfa Romeo 156

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