22 · Diagnostics

Gearbox differential unit noisy''/ / general

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
Section: Noisy'' / vibrations › Gearbox differential unit noisy''/ / general

Fault diagnosisGearbox differential unit noisy''/ / general

GEARBOX DIFFERENTIAL UNIT NOISY''/ / GENERAL

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

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check whether the noise persists under all circumstances	Continue to Step 1	The noise is mainly noticeable during take off	Continue according to the instructions in See table See table S21 NOISE'' GEARBOX / AT TAKE-OFF
			The noise is mainly noticeable in neutral	Continue according to the instructions in See table See table S22 NOISE'' GEARBOX / IN NEUTRAL
			The noise is mainly noticeable in one gear only	Continue according to the instructions in See table See table S23 NOISE'' GEARBOX / IN A SPECIFIC GEAR
			The noise is mainly noticeable round bends	Continue according to the instructions in See table See table S24 NOISE'' GEARBOX / ROUND BENDS
			The noise is noticeable in all driving conditions	Move on to Step 1 Continue to Step 1
1	CHECKING THE GEAR SET	All OK	Problems met	Operation
	Check the crown wheel and pinion reduction gear In particular: It should not be worn or damaged There should not be excessive clearance The crown wheel fixings should not be slack	Continue to Step 2	Excessive wear or clearance	Replace the crown wheel and pinion Op. 2110D28
		Continue to Step 2	Fastenings slack	Replace the crownwheel and pinion Op. 2110D28
2	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

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