22 · Diagnostics

Noise gearbox / round bends

Fault diagnosisNoise gearbox / round bends

NOISE GEARBOX / ROUND BENDS

1.6 TS, 2.0 TS

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

0	FIRST CHECK	All OK	Problems met	Operation
		Results of the tests
	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.	Continue to Step 1	Rolling noise which varies with the steering angle both to the left and the right	Replace the wheel hub bearings
		Continue to Step 1	Increasing the steering angle produces a noise similar to croaking which varies according to the wheel speed	Continue to Step 2
1	DIFFERENTIAL CHECK	All OK	Problems met	Operation
	Check the differential: In particular, check the bearings	Continue to Step 2	Bearings damaged	Replace the bearings Op. 2110D26
	Check the differential: In particular, check the bearings	Continue to Step 2	Internal gears worn or damaged	Overhaul or replace the differential housing Op. 2110D10
2	WHEEL SIDE CONSTANT VELOCITY JOINT CHECK	All OK	Problems met	Operation
	Check the wheel side constant velocity joints	Continue to Step 3	Wheel side joint damaged	Replace the wheel side joint Op. 2710A20
3	CORRECT OPERATION CHECK	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'

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