Audi Workshop Service and Repair Manuals

Assessing wear on input shaft

3 -	Friction plates

6 -	Pressure plate

q	Checking for wear → Fig.

7 -

Piston

q	Checking for wear → Fig.

8 -

Cover

q	For input shaft

q	Checking → Fig.

10 -	Ball bearing

q	For input shaft

q	Renew ball bearing if input shaft cover has been removed

11 -	Input shaft

q	Checking contact and sealing surfaces for wear → Fig.

q	Checking for traces of scoring by friction plates → Fig.

13 -

Oil pipe

q	Checking for wear → Fig.

Checking piston and pressure plate for wear –  Pull piston -1- out of pressure plate -2-. Checking pressure plate -2- –  Check contact/sealing surface -arrow A- of pressure plate for wear. –  Check contact/sealing surface -arrow D- of pressure plate for wear. l  If the contact/sealing surface -arrow A- is scored or scratched, the pressure plate -2- must be renewed. l  If the contact/sealing surface -arrow D- is scored or scratched, the pressure plate -2- and the piston -1- must be renewed. Checking piston -1- –  Check oil seal -arrow B- on outer circumference of piston -1- for damage. –  Check contact surface -arrow C- on inner circumference of piston -1- on shaft. l  If the oil seal -arrow B- is damaged or the contact surface -arrow C- of the piston is scored or scratched or of uneven thickness due to wear, the piston -1- must be renewed.

Checking contact and sealing surfaces of input shaft for wear –  Check contact/sealing surface -arrow A- of input shaft for wear.   Note t  The oil seal in the input shaft cover provides a seal on this sealing surface -arrow A-. t  Slight scoring caused by the oil seal is normal. –  Check contact surface -arrow B- of ball bearing for input shaft in input shaft cover for wear. –  Check oil seal -arrow C- on input shaft for damage. l  If oil seal -arrow C- is damaged or contact surfaces -arrow B- or -arrow A- on input shaft are severely scored, the entire input shaft must be renewed.

Checking for scoring caused by friction plates on inner circumference of input shaft cylinder –  Check inner circumference of input shaft cylinder for scoring caused by friction plates -arrows-. l  If scoring by friction plates -arrows- is found on inner circumference of input shaft cylinder, the entire input shaft must be renewed.

Assessing wear on oil pipe –  Check oil seal -1- on oil pipe for damage. l  There should be a gap on the seal -arrow B-. l  If gap -arrow B- is completely closed, oil pipe must be renewed. –  Check contact surfaces -arrows- and rotor vanes -arrow A- on oil pipe for wear and damage. l  Oil pipe must be renewed if oil seal -1- or rotor vanes -arrow A- are damaged or if contact surfaces -arrow- are severely scored. l  O-ring -2- must be renewed. –  Check contact surface of oil pipe in suction-jet pump.

Checking input shaft cover –  Check the contact surface of the cover -arrow- and the cover itself for damage. l  The contact surface must not exhibit any signs of damage. l  The input shaft cover must not be broken or cracked. –  If contact surface or cover is damaged, renew input shaft cover.