16 · Diagnostics

S21 Gearbox noise at pick-up

Fault diagnosisS21 Gearbox noise at pick-up

With the engine running, when the various gears are engaged, there is a noise during take-off: the noise varies as the speed varies

Step	Test procedure	Result	Action
1	CHECKING THE GEAR SET Check the crown wheel and pinion reduction gear (see OVERHAULING GEARBOXES Assembly 2110D) In particular: it should not be worn or damaged there should not be excessive clearance the ring gear fixings should not be slack	OK	Move onto step 2
1		Reduction gear damaged	Restore the clearance or, if necessary, replace the reduction gear End of diagnosis
2	CHECKING PLANET CARRIER Check the wear of the planet carrier or the housing in the differential case (see OVERHAULING GEARBOXES Assembly 2110D)	OK	Move onto step 3
2		Differential case worn	Replace the differential casing End of diagnosis
3	CHECKING 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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