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Clutch "D/G” with freewheel > < Assessment of wear by checking ATF for colour and contamination

A4 Cabriolet Mk2

Clutch “F”
   
Clutch “F”
1 - Cylinder “F”
q   Check inner surfaces for traces of scoring by friction plates → Fig.
q   Check outer surfaces for traces of scoring by friction plates → Fig.
q   Check splines
q   Checking needle bearing and metal bush for wear → Fig.
3 - Piston “F”
q   Check for wear
6 - Dished spring
q   Renew if there are traces of scoring or if ends of dished spring are bent.
q   Renew dished spring if broken
7 - Split retaining ring
q   Renew if distorted
10 - Outer plate
q   Checking for wear → Fig.
11 - Friction plate
q   Checking for wear → Fig.

   
Checking inner surfaces of cylinder “F” for traces of scoring by friction plates
–  Check inner surfaces of cylinder “F” for scoring by friction plates.
l  Friction plates must not get stuck in scores -arrow-.
If the scores -arrows- caused by the friction plates are deeper than 0.5 mm:
–  Renew cylinder “F” and freewheel inner race of clutch “D/G”.
  A37-10363
Checking outer surfaces of cylinder “F” for traces of scoring by friction plates
–  Check outer surfaces of cylinder “F” for scoring by friction plates.
l  Friction plates must not get stuck in scores -arrow-.
If the scores -arrows- caused by the friction plates are deeper than 0.5 mm:
–  Renew cylinder “F”.
  Note
Damage of this kind is invariably caused by a defective valve body.
  A37-10364
Checking needle bearing and metal bush in cylinder “F” for wear
–  Visually inspect needle bearing -arrow 1-.
l  The needle bearing should be in as-new condition.
–  Renew cylinder “F” if necessary.
–  Check running surface of metal bush -arrow 2- in cylinder “F” 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 “F”.
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. The running surface should now be in as-new condition.
If scoring is still present after this step:
–  Renew cylinder “F”.
  A37-10365
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 "D/G” with freewheel > < Assessment of wear by checking ATF for colour and contamination