Audi A8 2003 Workshop Manual page 171

8-cylinder TDI engine (4.2 ltr. 4-valve common rail), mechanics - Edition 12.2013
1 - Valve
❑ Do not machine, only
grinding-in is permitted
❑ Mark installation posi‐
tion for re-installation
❑ Valve dimensions
⇒ page 180
❑ Checking valve guides
⇒ page 180
2 - Cylinder head
❑ See note ⇒ page 164
❑ Checking valve guides
⇒ page 180
❑ Machining valve seats
⇒ page 180
3 - Valve stem oil seal
❑ Renewing with cylinder
head installed
⇒ page 173
❑ Renewing with cylinder
head removed
⇒ page 176
4 - Valve spring
5 - Valve spring plate
6 - Valve cotters
7 - 10 Nm
❑ Observe correct tighten‐
ing sequence
⇒ page 173
8 - 10 Nm
❑ Observe correct tighten‐
ing sequence
⇒ page 173
9 - Retaining frame
❑ With integrated camshaft bearings
❑ Removing and installing
10 - Inlet camshaft
❑ Removing and installing
❑ Measuring axial clearance
❑ Measuring radial clearance
❑ Runout: max. 0.01 mm
11 - Exhaust camshaft
❑ Removing and installing
❑ Measuring axial clearance
❑ Measuring radial clearance
❑ Runout: max. 0.01 mm
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permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
12 - Roller rocker finger
with respect to the correctness of information in this document. Copyright by AUDI AG.
❑ Mark installation position with a coloured pen
❑ Do not interchange
❑ Check roller bearings for ease of movement
❑ Lubricate contact surface
⇒ "3.4 Removing and installing camshafts", page 167
⇒ page 167
⇒ page 166
⇒ page 167
⇒ page 167
⇒ page 166
⇒ page 167
Audi A8 2003 ➤
165
3. Servicing valve gear