18 · Diagnostics

S21 Gearbox noise at pick-up

Fault diagnosisS21 Gearbox noise at pick-up

On setting off, when the various gears are engaged and the clutch released, or at the start of deceleration, there is a noise (jolt)

Step	Test procedure	Result	Action
1	FIRST CHECK Kingpin attachment Shock absorber/suspension attachment Condition and attachment of bushes and flexible mountings securing power unit and moving suspension components Condition and play on steering balljoints	OK	Move onto step 2
		Wheel attachments loose	Retighten attachments End of diagnosis
		Track control arm flexible mountings damaged	Replace track control arms End of diagnosis
2	CHECKING THE CROWNWHEEL AND PINION Check whether the crownwheel and pinion are worn or damaged, and that the crownwheel attachments are not damaged	OK	Move onto step 3
2		Crownwheel and pinion worn	Replace the crownwheel and pinion End of diagnosis
3	CHECK ON DIFFERENTIAL UNIT Check the wear of the satellite carrier bearing or the housing in the differential housing Check differential bearing preload	OK	Move onto step 4
		Casing worn	Replace casing End of diagnosis
		Preload not correct	Adjust preload as specified End of diagnosis
4	CHECK ON CORRECT OPERATION Check that the fault is no longer present	OK	Incorrect selection of diagnostic procedure
4		Fault persists	Incorrect selection of diagnostic procedure

Parts & tools for this job For 2000 Alfa Romeo 147

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