Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
4
Pistons and conrods
Note
Oil spray jet for piston cooling
.
4.1
Pistons and conrods - exploded view
1 - Conrod bolt, 50 Nm + turn
90° further
❑ Renew
❑ Use old bolts when
measuring radial clear‐
ance
❑ Lubricate threads and
contact surface
2 - Conrod bearing cap
❑ Do not interchange
❑ Mark cylinder allocation
in colour
❑ Installation position of
conrod pairs
3 - Bearing shells
❑ Ensure that retaining
lugs are securely seat‐
ed.
❑ Renew used bearing
shells
❑ There are oversized
bearings available for
machined crankshaft
conrod journals ⇒ Elec‐
tronic parts catalogue
4 - Conrod
❑ Only renew as a com‐
plete set
❑ Mark cylinder allocation
in colour
❑ Installation position of
conrod pairs
❑ Axial clearance for each conrod pair (when new): 0.20 … 0.38 mm
❑ Measuring radial clearance
5 - Piston pin
❑ If difficult to move, heat piston to approx. 60 °C
❑ Remove and install using drift - VW 222 A-
6 - Circlip
❑ Renew
7 - Piston
❑ Installation position for piston
❑ Piston and cylinder dimensions, piston allocation for cylinder bore
❑ Checking
Audi A8 2003 ➤
10-cylinder direct petrol injection engine (5.2 ltr. 4-valve), mechanics - Edition 10.2013
4. Pistons and conrods
73