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3 Assessment of wear on gearbox
components
Overview
♦ ⇒ „3.1 Assessment of wear by checking ATF for colour and
contamination“, page 164
♦ ⇒ „3.2 Clutch C “, page 165
♦ ⇒ „3.3 Clutch D “, page 167
♦ ⇒ „3.4 Planetary drive II and III “, page 169
♦ ⇒ „3.5 Clutch B “, page 171
♦ ⇒ „3.6 Body II “, page 172
♦ ⇒ „3.7 Clutch A “, page 175
♦ ⇒ „3.8 Clutch E “, page 176
♦ ⇒ „3.9 ATF supply unit“, page 178
3.1 Assessment of wear by checking ATF
for colour and contamination
Colour of ATF
♦ Colour yellow or blue: ATF is new.
♦ Colour brown: ATF is used (approx. 60,000 km upwards)
♦ Colour black: gearbox component is defective (e.g. overheat‐
ing of torque converter lock-up clutch, burnt out clutch linings).
Note
On vehicles with TDI engines, the ATF turns black after approx.
60,000 km without the gearbox being defective.
ATF contains metal particles
♦ Wear is within normal range if metal particles on magnet in oil
pan or in ATF are smaller than 0.1 mm ∅ and quantity is not
more than 1 cm
3
.
♦ Metal particles larger than 2.0 mm ∅ on magnet in oil pan or
in ATF indicate abnormal wear or a mechanical fault in the
gearbox.
Procedure if ATF is contaminated
ATF very contaminated (ATF black or metal particles in ATF
⇒ page 164 ):
♦ Dismantle and clean complete gearbox.
♦ Flush ATF galleries and blow through with compressed air.
♦ Dismantle and check all clutches.
♦ Renew torque converter (cannot be cleaned).
♦ Renew mechatronic unit (cannot be cleaned).
♦ Clean ATF lines and ATF cooler and renew ATF strainer.
Audi A6 2005 ➤ , Audi A8 2003 ➤
Servicing automatic gearbox 09E, four-wheel drive - Edition 12.2011
164 Rep. gr.39 - Final drive - front differential
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