Audi Workshop Service and Repair Manuals

Assessing wear on chain, pulley sets “I” and “II”, bearing “C” and suction-jet pump

4 -	Pulley set “II”

q	Checking tapered pulleys → Fig.

q	Checking running surface for bearing “G” → Fig.

q	Cannot be renewed individually

6 -	Suction-jet pump

q	Checking → Fig.

7 -	Guide rail

q	Check; renew if scored

14 -

Chain

q	Checking → Fig.

15 -	Pulley set “I”

q	Checking tapered pulleys → Fig.

q	Checking running surface for bearing “D” → Fig.

Always renew pulley sets “I” manufactured between 10.2002 and 08.2003 (improved materials)

17 -	Bearing “C”

q	Roller bearing for pulley set “I”

q	Checking → Fig.

Checking tapered pulleys for pulley set “II” –  Check that tapered pulleys -arrow- for pulley set “II” are smooth with no traces of scoring. –  Run your finger nail from inside to outside over entire surface of tapered pulley to assess damage on running surface. l  Any very slight scores or damage that cannot be felt with the finger nail can be disregarded. l  If you feel any scores or damage with your finger nail, or if your nail catches, renew gearbox. –  Perform an additional visual inspection. l  The gearbox must be renewed if there are any individual scores which appear polished (mirrored) with black edges.

Checking running surface for bearing “G” for pulley set “II” l  Running surface -1- for bearing “G” should be in as-new condition. –  Run your finger nail from inside to outside over entire surface to assess damage on running surface. l  Any very slight scores or damage that cannot be felt with the finger nail can be disregarded. l  If you feel any scores or damage with your finger nail, or if your nail catches, renew gearbox.

Checking tapered pulleys for pulley set “I” –  Check that tapered pulleys -arrow- for pulley set “I” are smooth with no traces of scoring.   Note -Items 1 and 2- can be disregarded. –  Run your finger nail from inside to outside over entire surface of tapered pulley to assess damage on running surface. l  Any very slight scores or damage that cannot be felt with the finger nail can be disregarded. l  If you feel any scores or damage with your finger nail, or if your nail catches, renew pulley set “I”. –  Perform an additional visual inspection. l  Pulley set “I” must be renewed if there are any individual scores which appear polished (mirrored) with black edges.

Checking running surfaces for bearing “C” and bearing “D” (roller bearings for pulley set “I”)   Note -Arrow- can be disregarded. l  Running surfaces -2- for bearing “C” and -1- for bearing “D” should be in as-new condition. –  Run your finger nail from inside to outside over entire surface to assess damage on running surface. l  Any very slight scores or damage that cannot be felt with the finger nail can be disregarded. l  If you feel any scores or damage with your finger nail, or if your nail catches, renew pulley set “I”.

Checking bearing “C” (roller bearing for pulley set “I”) –  Check bearing “C”-item 1- for damage: l  The roller bearings should not exhibit any signs of damage on the surface. l  There must be no cracks or chips on the bearing cage. –  Run your finger nail over the entire running surface to assess the damage on the roller bearings. l  Any very slight scores or damage that cannot be felt with the finger nail can be disregarded. l  If you feel any scores or damage with your finger nail, or if your nail catches, renew bearing “C”. –  Also check running surface on pulley set “I” → Fig..

Checking suction-jet pump l  Input shaft removed → Chapter –  Check contact surface -arrow- of oil pipe in suction-jet pump through opening in gearbox housing for scoring, scratches or damage. l  The contact surface of the oil pipe in the suction-jet pump -arrow- should not have tangible step-shaped scores or scratches. l  If the oil pipe has caused tangible step-shaped scores or damage to the contact surface, the suction-jet pump must be renewed. –  Check the oil pipe in addition → Chapter.

Checking chain –  Check that end faces of chain pins are still convex in shape with round edges -arrow A-. –  If edges of chain pins have become abraded or sharp, or if burrs have formed (due to wear or a slipping chain) -arrow B-, chain must be renewed. –  Also check running surface on pulley set “I” → Fig. and pulley set “II” → Fig..