18 · Diagnostics

S23 Gearbox noise in a specific gear

Fault diagnosisS23 Gearbox noise in a specific gear

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

Step	Test procedure	Result	Action
1	SPEED GEARS CHECK Overhaul the gearbox Op. 2110B20 . In particular, check the teeth of the gear concerned: they should not be worn or show signs of seizing	OK	Move onto step 2
1		Gears worn or damaged	Replace the gears involved End of diagnosis
2	SPEED SLEEVES AND SELECTOR FORKS CHECK Check the selector forks and the sleeves for the speed concerned: they should not be worn or damaged	OK	Move onto step 3
2		Sleeves or selector forks worn	Replace the components involved End of diagnosis
3	CORRECT OPERATION CHECK Check that the fault is no longer present	OK	Incorrect selection of diagnostic procedure
3		Fault persists	Incorrect selection of diagnostic procedure

Parts & tools for this job For 2000 Alfa Romeo 147

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