Audi A8 2003 Workshop Manual page 141

– Install timing chain (left-side) with camshaft sprocket, guide
rail and tensioning rail.
• The elongated holes in the sprocket must be aligned centrally
over the tapped holes in the camshaft.
– Tighten bolts -1- and -3- for guide rail and tensioning rail.
– Screw in two bolts -2- for sprocket, but do not tighten bolts.
• It should just be possible to turn the sprocket on the camshaft
without axial movement.
– Lock camshaft (left-side) with adjustment pin - T40060- .
• 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.
– Pull out drill bit (∅ 3.3 mm) -item 4- from hole; this releases
the chain tensioner (left-side).
– Install timing chain (right-side) with camshaft sprocket and
chain tensioner.
• The elongated holes in the sprocket must be aligned centrally
over the tapped holes in the camshaft.
– Tighten bolts -1- for chain tensioner.
– Screw in two bolts -2- for sprocket, but do not tighten bolts.
• It should just be possible to turn the sprocket on the camshaft
without axial movement.
– Lock camshaft (right-side) with adjustment pin - T40060- .
• 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.
– Pull locking pin - T40071- out of locating hole, this releases
the chain tensioner (right-side).
– Using a torque wrench and adapter - T40062- , apply a torque
of 20 Nm to camshaft sprocket (right-side) in the direction in‐
dicated (-arrow-). Maintain this torque for the following step.
– Tighten bolts -1- and -2-.
– Take off adapter - T40062- and pull out adjustment pin -
T40060- .
– Tighten remaining bolts for sprocket (right-side).
– Using a torque wrench and adapter - T40062- , apply a torque
of 15 Nm to camshaft sprocket (left-side) in the direction indi‐
cated (-arrow-). Maintain this torque for the following step.
– Tighten bolts -1- and -2-.
– Take off adapter - T40062- and pull out adjustment pin -
T40060- .
– Tighten remaining bolts for sprocket (left-side).
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with respect to the correctness of information in this document. Copyright by AUDI AG.
8-cylinder TDI engine (4.2 ltr. 4-valve common rail), mechanics - Edition 12.2013
Audi A8 2003 ➤
135
1. Chain drive