Audi A8 2003 Workshop Manual page 149

8-cylinder TDI engine (4.2 ltr. 4-valve common rail), mechanics - Edition 12.2013
♦ Locking pin - T40071-
Removing
– Release fasteners -1-, -2- and -4- and take off noise insulation
panels.
– Position used oil collection and extraction unit below engine.
– Drain off engine oil.
– Remove engine ⇒ page 8
– Separate engine from gearbox
– Secure engine to engine stand
– Remove timing chain covers
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– Press tensioning rail in direction of -arrow- and lock chain ten‐
sioner by inserting locking pin - T40071- .
Note
Should you need to remove the chain sprocket for auxiliary drives,
you must first loosen the securing bolt before removing the chain.
– Mark running direction of chain for auxiliary drives with paint.
– Unscrew bolts -1 ... 3- and remove chain tensioner.
– Remove chain for auxiliary drives.
Installing
Installation is carried out in the reverse order; note the following:
Note
Renew bolts which are tightened to a specified angle as well as
seal.
– First fit chain for auxiliary drives.
– Fit chain tensioner to engine (fit top bolt first) and fit chain onto
guide rails (working from bottom to top).
.
⇒ page 31 .
⇒ page 38 .
⇒ page 108 .
Audi A8 2003 ➤
143
1. Chain drive