22 · Diagnostics

Clutch vibrating or jerking

Make: Alfa Romeo
Model: 147 Factory Service Manual
Year: 2000–2004
Section: Clutch › Clutch vibrating or jerking

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Fault diagnosisClutch vibrating or jerking

CLUTCH VIBRATING OR JERKING

1.6 TS

The clutch pedal vibrates and 'jerks'. When released, the vehicle does not start smoothly, but jerks or vibrates

Preliminarily check:

engine idle speed

1	CLUTCH PEDAL CHECK	All OK	Problems met	Operation
		Results of the tests
	Check the clutch pedal travel	Continue to Step 2	Pedal travel not correct	Restore the operation of the clutch pedal
2	ENGINE SUPPORT CHECK	All OK	Problems met	Operation
	Check the condition and the centering of the front crossmember and the engine supports and attachment link	Continue to Step 3	Faulty link attachment	Bed in the fixings: loosen the bolts, centre them in their housings and tighten them to torque Op. 1008A10
			Faulty link attachment	Bed in the fixings: loosen the bolts, centre them in their housings and tighten them to torque
			Faulty crossmember attachments	Bed in the fixings: loosen the bolts, centre them in their housings and tighten them to torque
3	CLUTCH PLATE CHECK	All OK	Problems met	Operation
	Verify: that there is no damage to the flexible coupling springs clutch disc wear or 'vitrification' that there is no damage to the pressure plate diaphragm spring	Continue to Step 4	Fault in clutch pressure plate	Replace the clutch plate ( Op. 1810A20). If there is oil, replace the gearbox input oil seal.
		Continue to Step 4	Fault in clutch pressure plate	Replace the clutch pressure plate Op. 1810A20
4	CHECK SPLINED HUB	All OK	Problems met	Operation
	Check for excess grease on the clutch plate hub bushes and the gearbox main shaft, and the condition of the assembly	Continue to Step 5	Faulty gearbox main shaft or clutch plate	Restore the correct lubrication of the bush. If necessary, replace the clutch plate Op. 1810A20or the gearbox main shaft
5	FLYWHEEL CHECK	All OK	Problems met	Operation
	Check the condition of the flywheel (in particular, the state of the surface, making sure that there is no overheating, uneven wear, incisions or material removed)	Continue to Step 6	Flywheel damaged	Replace the flywheel Op. 1024B22
6	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'

2.0 TS

The clutch pedal vibrates and 'jerks'. When released, the vehicle does not start smoothly, but jerks or vibrates

Preliminarily check:

engine idle speed

1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
		Results of the tests
	Connect the diagnostic equipment (Examiner or Examiner Plus) to the diagnostic socket and check: That there are no errors in the Selespeed control unit	Continue to Step 2	That there are no faults in the control units	Continue according to the instructions for the diagnostic equipment
2	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Keeping the diagnostic equipment connected (Examiner or Examiner Plus) to the diagnostic equipment, carry out in active diagnosis: Clutch self-calibration Clutch pushrod adjustment	Continue to Step 7	Fault persists	Continue to Step 3
3	ENGINE SUPPORT CHECK	All OK	Problems met	Operation
	Check the condition and the centering of the front crossmember and the engine supports and connecting rod	Continue to Step 4	Engine supports faulty	Bed in the fixings: loosen the bolts, centre them in their housings and tighten them to torque Op. 1008A10
			Faulty link attachment	Bed in the fixings: loosen the bolts, centre them in their housings and tighten them to torque
			Faulty crossmember attachments	Bed in the fixings: loosen the bolts, centre them in their housings and tighten them to torque
4	CLUTCH PLATE CHECK	All OK	Problems met	Operation
	Verify: that there is no damage to the flexible coupling springs clutch disc wear or 'vitrification' that there is no damage to the pressure plate diaphragm spring	Continue to Step 5	Faulty clutch plate	Replace the clutch plate ( Op. 1810A20) If there is oil, replace the gearbox input oil seal
		Continue to Step 5	Faulty clutch pressure plate	Replace clutch pressure plate Op. 1810A20
5	CHECK SPLINED HUB	All OK	Problems met	Operation
	Check for excess grease on the clutch plate hub bushes and the gearbox main shaft, and the condition of the assembly	Continue to Step 6	Faulty gearbox main shaft or clutch plate	Restore the correct lubrication for the bushes. If necessary, replace the clutch plate Op. 1810A20or the gearbox main shaft
6	FLYWHEEL CHECK	All OK	Problems met	Operation
	Check the condition of the flywheel (in particular, the state of the surface, making sure that there is no overheating, uneven wear, incisions or material removed)	Continue to Step 7	Flywheel damaged	Replace the flywheel Op. 1024B22
7	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'

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Parts & tools for this job For 2000 Alfa Romeo 147

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