22 · Diagnostics

Noise'' gearbox / in neutral

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
Section: Noisy'' / vibrations › Noise'' gearbox / in neutral

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Fault diagnosisNoise'' gearbox / in neutral

NOISE'' GEARBOX / IN NEUTRAL

With the vehicle stationary, the gear lever in neutral and the engine running, there is a high frequency, low intensity noise in the area of the gearbox. The fault is often accompanied by an oil leak from the gearbox: also see [DI_X015]

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Press the clutch pedal and check whether the noise disappears or decreases	Continue to Step 1	Noise remains constant	Continue to Step 3
1	GEARBOX/DIFFERENTIAL FLUID LEVEL CHECK Check the gearbox/differential fluid level	All OK	Problems met	Operation
		Continue to Step 2	Level too low	Restore the correct level and carry out a road test. If the problem persists, Continue to Step 3
2	GEARBOX BEARING CONDITIONS CHECK	All OK	Problems met	Operation
2.0 JTS	Overhaul the gearbox Op. Op. 2110B32 MANUAL GEARBOX (5 SPEED) WITH DIFFERENTIAL - DISMANTLE AND REBUILD - WASH AND CHECK PARTS - REPLACE SYNCHRONISERS, INNER CONTROLS, GEARS, SHAFTS AND BEARINGS . In particular, check the gearbox bearings: they should not show signs of wear	Continue to Step 3	Bearings worn	Replace the bearings Op. Op. 2110B32 MANUAL GEARBOX (5 SPEED) WITH DIFFERENTIAL - DISMANTLE AND REBUILD - WASH AND CHECK PARTS - REPLACE SYNCHRONISERS, INNER CONTROLS, GEARS, SHAFTS AND BEARINGS
1.9 JTD 16V 3.2 V6	Overhaul the gearbox Op. 2110B36 . In particular, check the gearbox bearings: they should not show signs of wear	Continue to Step 3	Bearings worn	Replace the bearings Op. 2110B36
3	CLUTCH PLATE CHECK	All OK	Problems met	Operation
	Check: Thrust bearing; Clutch plate fouling (oil or grease) Clutch plate not distorted; No damage to the pressure plate diaphragm spring; No damage to the flexible coupling springs	Continue to Step 4	Clutch plate or pressure plate faulty	Replace the clutch plate Op. Op. 1810A24 CLUTCH - R + R WITH GEARBOX REMOVED
		Continue to Step 4	Thrust bearing faulty	Replace the bearing Op. 1820A30
4	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

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Parts & tools for this job For 2003 Alfa Romeo GT

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