23 · Diagnostics

Clutch vibrating or jerking

Make: Alfa Romeo
Model: Brera and Spider Factory Service Manual
Year: 2005–2010
Section: Clutch › Clutch vibrating or jerking

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Fault diagnosisClutch vibrating or jerking

CLUTCH VIBRATING OR JERKING

0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Carry out a driving cycle simulating a hilly/urban route with frequent gear changes and departures from a standstill letting the engine and, in particular, the clutch reach operating temperature. Carry out departures from a standstill with the engine speed not below 1000 rpm releasing the clutch pedal gradually simulating the vehicle driving in traffic at a speed of around 10-20 km/h for a few seconds. Carry out departures at different engine speeds, hot and cold, at different gradients. Let the vehicle reach a constant speed (about 1000 rpm in 4th gear) and, with the clutch pedal released, accelerate quickly by fully depressing the accelerator pedal. Check whether there is irregular advance (jerking).	Move on to Step 1	Presence of irregular advance (jerking)	Check that the engine supports are properly secured.
1	CLUTCH LEVER TRAVEL CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check, inside the engine compartment, that when the clutch pedal is pressed the clutch control lever on the gearbox completes the correct travel.	Move on to Step 4	1.Clutch lever on gearbox travel incomplete.	1. Move on to Step 2
		Move on to Step 4	2. Clutch pedal free play insufficient.	2. Move on to Step 2
2	CLUTCH PEDAL CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Clutch pedal disconnected from transmission Op. 3330B26 CLUTCH PEDAL - R+R check that the travel is free and there is no sticking or hardening.	Move on to Step 3	Clutch pedal clearance or hardening.	Replace the pedal Op. 3330B26 CLUTCH PEDAL - R+R
3	ENGINE AND GEARBOX CASING ALIGNMENT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check for the centering pins on the engine block checking whether the flexible couplings have become loose if the centering pins are not present.	Move on to Step 4	1. The centering pins are missing.	1. Correct the problem by inserting the centering pins
		Move on to Step 4	2. The flexible couplings have become loose.	2. Restore the correct closure.
4	PLATE LEVER AND BEARING CHECK (WITH GEARBOX REMOVED)	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	After the gearbox has been removed, check that there is no hardening of the lever (as a result of dirt or insufficient greasing) and that the plate bearing slides freely in its housing and shows no signs of damage.	Move on to Step 5	The presence of dirt or wear due to insufficient greasing does not allow the plate bearing to slide correctly.	Replace the faulty or damaged components.
5	CLUTCH ASSEMBLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Visually inspect the state of the clutch assembly, making sure there are no breaks and/or signs of overheating on the plate, obvious deterioration of the driven disc or grease/oil on the friction surfaces. Measurements using the gauge as in the manual.	Move on to Step 6	1.Obvious deterioration of the clutch disc and/or plate broken.	1. Replace the assembly Op. 1810A24 CLUTCH - R + R WITH GEARBOX REMOVED
			2. Disc distorted.	2. Replace the clutch plate Op. 1810A24 CLUTCH - R + R WITH GEARBOX REMOVED
			3. Plate with vitrified seal.	3. Replace the clutch plate Op. 1810A24 CLUTCH - R + R WITH GEARBOX REMOVED
			4. Oil or grease on the disc.	4. Remove the oil or grease.
			5. Break at the base of the clutch disc friction material support segments.	5. Replace the clutch plate Op. 1810A24 CLUTCH - R + R WITH GEARBOX REMOVED
			6. Flexible coupling system seriously damaged.	6. Replace the mechanism Op. 1810A24 CLUTCH - R + R WITH GEARBOX REMOVED
6	CLUTCH SLIDING SPLINED HUB CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the following, in order: for excess grease on the clutch plate hub bushes and the gearbox main shaft; the condition of the main shaft hub.	Move on to Step 7	Main shaft damaged, hub worn, excess grease on the bushes.	Replace the hub and/or main shaft
7	FLYWHEEL CONDITION CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition of the flywheel. In particular, check: the state of the surface; wear; cuts; signs of overheating; presence of grease/oil on the surfaces.	End of diagnosis	1. Flywheel damaged.	1. Replace the flywheel Op. 1024B10 ENGINE FLYWHEEL - R + R FOR VERSIONS WITH MANUAL GEARBOX
		End of diagnosis	2. Presence of dust in the flywheel friction seal.	2. Remove the dust from the flywheel friction seal.

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Parts & tools for this job For 2005 Alfa Romeo Brera

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