Audi A8 Workshop Manual page 183

Checking drive lugs in ATF pump gear
– Check whether the drive lugs -arrows- on the ATF pump gear
have broken off; renew ATF pump if necessary.
Possible causes of fault:
♦ A - Incorrect installation of torque converter
♦ B - Centring sleeve for torque converter not inserted in crank‐
shaft
Caution
Make sure that broken-off drive lugs are found and removed.
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Checking brass bushes on stator shaft for wear.
– Check running surfaces of brass bushes -arrows- on inside of
shaft for wear.
• The running surfaces should not have any deep scoring and/
or blue discoloration.
If there are deep scores and/or blue discolouring:
– Renew ATF supply unit with stator shaft.
– Check rectangular section seals and input shaft of clutch „E".
– Check clutch „A".
• Proceed as follows if the running surfaces have no blue dis‐
coloration and there is only slight scoring:
– Rub down running surface one or two times with abrasive pa‐
per and oil (grain size 600).
– Clean running surface thoroughly with clean cloth and check
running surface.
If scoring is still present after this step:
• The running surfaces should now be in as-new condition.
– Renew ATF supply unit with stator shaft.
Checking rectangular section seals for wear
Always renew rectangular section seals. Nevertheless, the wear
pattern on the rectangular section seals gives an indication of the
condition of the contact surface for the seals. For this reason it is
always advisable to check the rectangular section seals for wear.
If the axial wear -arrow 1- on the rectangular section seals is ex‐
cessive (slight wear on the outside corners is normal):
– Renew ATF supply unit with stator shaft.
If the radial wear on the rectangular section seals exceeds 0.3
mm -arrow 2- (compare with thickness of new rectangular section
seal):
– Renew cylinder „A"
Servicing automatic gearbox 09E, four-wheel drive - Edition 12.2011
⇒ Item 1 (page 175) .
Audi A6 2005 ➤ , Audi A8 2003 ➤
3. Assessment of wear on gearbox components
179