Audi A8 2010 Workshop Manual page 33

Simos direct petrol injection and ignition system (6-cyl. 3.0 ltr. TFSI 4-valve) - Edition 12.2011
– Push vacuum hoses to one side.
– Unplug electrical connector -4- at fuel pressure sender -
G247- .
– Unscrew union nut -1- (counterhold threaded connection).
– Remove bolts and nuts -arrows- and detach intake manifold
(bottom section) with fuel rail.
– Unplug electrical connector -2- at intake manifold flap poten‐
tiometer and pull off vacuum hose -3-.
Caution
Risk of irreparable damage to engine.
♦ Block off the intake ports with clean cloths to prevent small
objects from dropping into the engine through the intake
ports in the cylinder heads.
Installing
Installation is carried out in the reverse order; note the following:
Tightening torques
• ⇒ „2.7 Intake manifold (bottom section), fuel rail, injector - ex‐
ploded view", page 22
• ⇒ Fig. "„Intake manifold (bottom section) - tightening torque"" ,
page 24 .
Note
If an injector has been pulled out of the cylinder head, the tef‐
♦
lon ring seal must be renewed.
Renew gaskets, seals and O-rings.
♦
Lubricate O-rings of injectors lightly with clean engine oil.
♦
Caution
Risk of damage to intake manifold flaps.
♦ To prevent the intake manifold flaps from catching on the
guide plates in the cylinder head, the flaps must be in the
output position -arrows- (intake channel fully open) when
the intake manifold (bottom section) is installed.
.
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Audi A8 2010 ➤
29
2. Injection system