audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

ABOUT US
Clutch "A” > < Planetary drive "III”

A4 Mk1

Clutch “B”
   
Clutch “B”
  Caution
The illustration shows the currently installed version of clutch “B”, with corrugated spring → Item, 2 outer plates → Item and 2 friction plates → Item. If an older version is installed (with no corrugated spring but 3 friction plates and 3 outer plates), always renew clutch “B”.
2 - Cylinder “B”
q   Check running surface of rectangular section seals for wear → Fig.
4 - Piston “B”
q   Check that valve ball moves easily → Fig.
6 - Dished spring
q   Renew if there are traces of scoring or if ends of dished spring are bent.
7 - Split retaining ring
q   Renew if distorted
8 - Corrugated spring
9 - Outer plate
q   Checking for wear → Fig.
10 - Friction plate
q   Checking for wear → Fig.
 - 

   
Checking running surface for rectangular section seals in cylinder “B” for wear
–  Check running surface -arrow- in cylinder “B” for wear.
l  The running surface should not have any deep scoring and/or blue discoloration.
If there are deep scores and/or blue discolouring:
–  Renew cylinder “B”.
–  Check rectangular section seals → Item.
Proceed as follows if the running surface has no blue discoloration and there are only slight scores:
–  Rub down running surface one or two times with abrasive paper and oil (grain size 600).
–  Clean running surface thoroughly with clean cloth and check running surface.
l  The running surface should now be in as-new condition.
If scoring is still present after this step:
–  Renew cylinder “B”.
  A37-10367
Checking that valve ball in piston “B” moves freely
–  Lightly lubricate drilling for valve ball -arrow- from the front with oil.
  WARNING
Wear safety goggles.
–  Apply compressed air to valve ball from the rear.
t  Lift of ball is small (hardly visible).
t  No spring fitted (ball returns slowly).
If valve ball does not move:
–  Release ball with nail or tip of ballpoint pen.
If valve ball is still leaking or does not move:
–  Renew piston “B”.
  Note
A leaking or sticking valve ball will cause impairment of power transmission in reverse gear.
  A37-10375
Checking friction plates and outer plates for wear
Signs of overheating on the outer plates indicate that the friction plates are worn. Assess the degree of wear as described below:
A - Heat discoloration spots at intervals of more than 20 mm: outer plates and friction plates are OK; they can be used again.
B - Heat discoloration spots at intervals of less than 20 mm: outer plates and friction plates are worn and require renewal.
C - If outer and/or inner parts of outer plates are discoloured blue or brown: outer plates and friction plates are worn and require renewal.
  A37-10212

Clutch "A” > < Planetary drive "III”