Valeoscope Commercial Vehicles Clutch 2020

Diagnosis Noise and vibration

3.3.2 Deterioration of the cover assembly centring

3.4 Noise and vibration

Reasons due to engine: The acyclism generates noise or vibration in the driveline or in the cab.

Diagnosis ò ò The wrong assembly of the cover assembly on the flywheel leads to an eccentricity which produces: • Unbalance (vibration) • Friction (noise and damage of cover assembly and clutch housing). ò ò This can be checked visually through the holes of the clutch housing. Attention Ɂ Ɂ Check carefully the flywheel centring type and compatibility with the cover assembly (centering pins, centring by outer diameter, by flat or by hollow flywheel…). Advice   Follow Valeo instructions for mounting cover assembly on flywheel and bolting method.

Reasons due to the clutch: ●● Release bearing: bearing, pedal

●● Cover assembly: balancing, jamming, centering ●● Disc assembly: damper, deformation, facings Reasons due to the clutch environment: ●● Pilot bearing ●● Engine and gearbox mounts 3.4.1 Reasons due to the clutch 1. Damaged cover caused by friction Clutch inspection ●● Cover deformed at centering area. ●● Cover damaged because of interference with housing. Vehicle behavior ●● Friction noise when starting the engine. ●● Abnormal vibrations when increasing the engine speed

Cover assembly

3.3.3 Breakage of the fork contact area ª ª Refer to chapter 3.1 3.3.4 Judder caused by grease ª ª Refer to chapter 3.1 3.3.5 Seized tube-guide/seized sleeve ª ª Refer to chapter 3.2 3.3.6 Seized fork on ball pivot/axis ª ª Refer to chapter 3.2

Parts inspection The cover is deformed or damaged.

Vehicle behavior ●● It is impossible or difficult to shift gears. ●● Slippage of the clutch. ●● Clutch judder. Reasons ●● Wrong bolting of cover assembly or wrong centring on flywheel. ●● Wrong cover assembly part number was fitted. ●● The cover assembly does not correspond to the type or to the diameter of the centering of the flywheel. Diagnosis ò ò Wrong assembly of cover assembly on flywheel (positioning or incorrect bolting) can generate a deterioration of centring device and can damage flywheel with cracks (burrs on cover machined areas, break of the flywheel "edge") Attention ò ò Check the conformity of the cover assembly with the centring system on the flywheel.

2. Seized ball bearing

Clutch inspection ●● The bearing is seized or cannot rotate. ●● Fast wear and break of diaphragm fingers. Vehicle behavior ●● Wrong declutching ●● Noise in clutch

Damaged cover due to friction

Advice   Follow the Valeo instructions for fitting and bolting cover assemblies.

Reasons ●● Positioning defect (centering) of cover assembly to flywheel during assembly operation. ●● Use of wrong part number of cover assembly (centering diameter not suitable).

Seizing of the ball bearing

Reasons ●● Wrong condition or incorrect adjustment of the clutch linkage. ●● The release bearing has been immerged in cleaning liquid. ●● Grease leakage ●● Overheating.

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