18 · Diagnostics

S20 Gearbox/differential unit noise general

Fault diagnosisS20 Gearbox/differential unit noise general

With the engine running and the vehicle moving, there is a noise from the area of the gearbox in all conditions.

Step	Test procedure	Result	Action
0	PRELIMINARY CHECKS Check whether the noise persists under all circumstances	OK	Move onto step 1
		The noise is mainly noticeable during setting off	See table S21 GEARBOX NOISE End of diagnosis
		The noise is mainly noticeable in neutral	See table S22 GEARBOX NOISE End of diagnosis
		The noise is mainly noticeable in one gear only	See table S23 GEARBOX NOISE End of diagnosis
		The noise is mainly noticeable round bends	See table S24 GEARBOX NOISE End of diagnosis
		The noise is noticeable in all driving conditions	Move onto step 1
1	CHECKING THE CROWNWHEEL AND PINION Check the crownwheel and pinion. In particular: it should not be worn or damaged there should not be excessive clearance the crownwheel fixings should not be slack	OK	Move onto step 2
		Clearance excessive	Restore the clearance or, if necessary, replace the crownwheel and pinion Op. 2110B20 End of diagnosis
		Clearance excessive	Replace the crownwheel and pinion Op. 2110D20 End of diagnosis
2	CHECK ON CORRECT OPERATION Check that the fault is no longer present	OK	Incorrect selection of diagnostic procedure
2		Fault persists	Incorrect selection of diagnostic procedure

Parts & tools for this job For 2000 Alfa Romeo 147

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