Audi A8 2003 Workshop Manual page 131

8-cylinder TDI engine (4.2 ltr. 4-valve common rail), mechanics - Edition 12.2013
– Press guide rail of chain tensioner for timing chain (right-side)
in direction of -arrow- and lock chain tensioner by inserting
locking pin - T40071- .
– Unscrew bolts -1- for chain tensioner and -2, 3- for camshaft
sprocket.
– Remove camshaft sprocket and chain tensioner (right-side).
Note
Cover chain tensioner opening with a cloth or similar to stop small
parts dropping in.
Installing
• Crankshaft -1- locked in TDC position with locking pin - 3242- .
Note
Renew bolts which are tightened to a specified angle as well as
seals and O-rings.
Caution
The crankshaft must not be at TDC at any cylinder when the
camshaft is turned. Otherwise, there is a risk of damage to
valves and piston crowns.
– Check that camshafts on both cylinder heads are positioned
at TDC.
• It should be possible to lock both camshafts with adjustment
pin - T40060- .
• The side pin -arrow- in each adjustment pin - T40060- must
be in line with the imaginary line between the adjustment pin
and the centre of the camshaft.
Cylinder bank 1 (right-side):
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Audi A8 2003 ➤
125
1. Chain drive