Removing And Installing Camshaft Timing Chains - Audi A8 2003 Workshop Manual

8-cylinder TDI engine (4.2 ltr. 4-valve common rail), mechanics - Edition 12.2013
Adjusting valve timing
If the adjustment pin cannot be inserted in one of the camshafts:
– Loosen all bolts -arrows- on the relevant sprocket approx.
1 turn.
– Apply adapter - T40061- to the heads of the loosened bolts.
– Turn camshaft slightly backwards and forwards with adapter -
T40061- until adjustment pin - T40060- can be inserted.
• The side pin -arrow- on the adjustment pin - T40060- must be
in line with the imaginary line between the adjustment pin and
the centre of the camshaft.
– Take off adapter - T40061- and tighten bolts ( adjustment pin
- T40060- remains inserted).
– Remove adjustment pin - T40060- .
– Repeat this procedure on the other cylinder bank if necessary.
– Remove locking pin - 3242- .
– Check valve timing once again
Remaining installation steps are carried out in reverse sequence;
note the following:
– Screw plug -arrow- for TDC mark into top section of sump with
a new seal.
– Install timing chain covers
– Install drive plate ⇒ page 71
– Install engine ⇒ page 40
Tightening torques
Component
Camshaft sprocket to camshaft
Guide rail to cylinder head (left-side)
Tensioning rail to cylinder head (left-side)
Chain tensioner to cylinder head (right-side)
Screw plug in top section of sump
•
1)
Renew bolts.
•
2)
90° = one quarter turn.
1.5

Removing and installing camshaft timing chains

⇒ page 128 .
⇒ page 112 .
.
.
5 + 90°
5 + 90°
5 + 90°
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1)2)
1)2)
1)2)
35
Audi A8 2003 ➤
129
1. Chain drive