Oil pipe to oil pump 1)
Oil pipes-to-upper oil pan (for vehicles with engine code
CGTA)
Oil pressure regulation valve-to-engine
Oil pressure switch
Oil pressure switch, level 3
Oil return line-to-right engine oil cooler
Oil separator
Oil supply line-to-right engine oil cooler
Oil temperature sensor-to-engine 2 double bolt
Pipe for the crankcase ventilation
Rear air guide-to-right engine oil cooler
Reduced oil pressure switch
Right engine oil cooler (Engine Code CGTA)
1)

Nm
5 plus an
additional 90°
(¼ turn)
8
30
9
9
20
4
25
9
8 plus an
additional 90°
(¼ turn)
9
9
20
20
9
3.2
9
9
3.2
9
20
9

Replace fastener(s).

98

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

Engine –
4.0L CEUA, CGTA

Upper Oil Pan Tightening Specifications

Replace any bolts that were tightened with an additional turn.
Step
1
2
3

Component
Tighten bolts 1 through 6 in a diagonal
sequence
Tighten bolts 1 through 6 in a diagonal
sequence
Tighten bolts 1 through 6 in a diagonal
sequence

Nm
Hand-tighten
5
an additional
90° (¼ turn)

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

99

Oil Pan Tightening Specifications

Replace any bolts that were tightened with an additional turn.
Step
1
2
3

Component
Tighten bolts (Æ) in a diagonal sequence
Tighten bolts (Æ) in a diagonal sequence
Tighten bolts (Æ) in a diagonal sequence

Nm
Hand-tighten
5
an additional
90° (¼ turn)

100 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

Engine –
4.0L CEUA, CGTA

Front Engine Oil Cooler Tightening Specification

Step
1

Component
Tighten bolts 1 through 7 in sequence

Nm
3

2

Tighten bolts 1 through 7 in sequence

9

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 101

Cooling System – 4.0L CEUA, CGTA
Fastener Tightening Specifications
Component
Bracket for after-run coolant pump 2)
- Bolt
- Bolt
- Nut
Bracket for charge air cooling pump-to-bracket for afterrun coolant pump
Bracket for engine coolant circulation pump 2-to-engine
coolant circulation pump 2
Bracket for engine coolant circulation pump 2-to-engine
Bracket for left cooler for charge air cooling circuit
Coolant connection-to-housing for the coolant pump
Coolant switch-off valve 1)
Engine coolant temperature sensor-to-engine
Engine temperature control sensor-to-engine
Fan shroud-to-fan
Fan wheel-to-fan shroud
Front charge air cooling circuit radiator-to-radiator
Front coolant pipe to engine nut/bolt
Housing for the coolant pump-to-coolant pump 1)
Hydraulic oil cooler-to-condenser
Lower left coolant pipe
Map controlled engine cooling thermostat-to-housing for
the coolant pump
Right coolant pipe on the right side of the transmissionto-engine
Transmission coolant valve bracket for engine coolant
circulation pump 2 to engine (vehicles with engine codes
CEUA)
Transmission fluid cooling valve-to-abracket for after-run
coolant pump
Upper left coolant pipe-to-aengine nut
Upper rear coolant pipe-to-aengine
1)
2)

Nm
1.5
9
9
9
1.5
9
9
9
5 plus an
additional 90°
(¼ turn)
9
9
3.5
5
5
9
8 plus an
additional 90°
(¼ turn)
5
9
9
9
9
9
9
9

Replace fastener(s).
For bolt tightening clarification, refer to ElsaWeb, After-Run Coolant Pump -V51-,
Charge Air Cooling Pump -V188-, Transmission Coolant Valve -N488- Overview“
items 2, 5, 6 and 9

102 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

Turbocharger – 4.0L CEUA, CGTA
Component
Air guide-to-throttle valve control module
Air guide pipe-to-turbocharger
Charge air cooler-to-charge air cooler housing
Charge air cooler housing-to-body
Charge air pressure sensor-to-air guide
Connection for oil return hose-to-turbocharger
Coolant supply pipe-to-turbocharger
Engine cover temperature sensor
Oil supply line-to-turbocharger
Retaining plate for coolant and oil lines-to-turbocharger
Turbocharger recirculation valve-to-air guide
Vacuum actuator for the turbocharger
- Ball pin
- Bolt

Nm
9
9
3.2
9
9
9
9
9
9
9
9
2.5
9

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 103

Engine –
4.0L CEUA, CGTA

Fastener Tightening Specifications

Left Turbocharger Tightening Specification

Step
1
2

Component
Tighten bolts 1 through 8 in sequence
Tighten bolts 1 through 8 in sequence

Nm
16
25

104 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

Engine –
4.0L CEUA, CGTA

Right Turbocharger Tightening Specification

Step
1
2

Component
Tighten bolts 1 through 8 in sequence
Tighten bolts 1 through 8 in sequence

Nm
16
25

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 105

Turbocharger Support Tightening Specification

Step
1
2

Component
Tighten bolts 1 to 3 in sequence
Tighten bolts 1 to 3 in sequence

Nm
5
25

106 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

Fuel Supply – 4.0L CEUA, CGTA
Component
Accelerator pedal module to pedal bracket
Air filter housing to bracket
Bracket for fuel tank pressure sensor
Bracket to the fuel tank
Carrier plate
EVAP canister
Fuel filler neck nut
Fuel filler neck bolt
Fuel tank
Fuel tank leak detection control module, nut
Fuel pump control module to bracket nut
Heat shield for fuel tank
Locking flange cover to floor
Locking ring to fuel tank
Securing strap

Nm
8
4
4
23
23
20
2.5
23
23
1.6
1.6
23
1.5
120
23

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 107

Engine –
4.0L CEUA, CGTA

Fastener Tightening Specifications

Locking Flange Cover Tightening Specification

Step
1

Component
Tighten bolts (Æ) in a diagonal sequence

Nm
1.5

Exhaust System, Emission Controls – 4.0L
CEUA, CGTA
Fastener Tightening Specifications
Component
Nm
Catalytic converter-to-manifold nut 1) 2)
23
Clamping sleeve
23
Front muffler-to-catalytic converter nut 1) 2)
23
Secondary Air Injection (AIR) pump motor bracket-to-air pump motor 3)
- Bolt
5
- Bolt
8
- Nut
9
Suspended mount-to-body
23
1)
2)
3)

Replace fastener(s).
Coat the threads with hot bolt paste.
For bolt tightening clarification, refer to ElsaWeb,Secondary Air Injection System
Overview items 1, 3 and 31.

108 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

Multiport Fuel Injection – 4.0L CEUA,
CGTA
Technical Data

Fuel pressure after high pressure
pump
Fuel pressure before high pressure
pump
1)

4.0L TFSI Engine
Cannot be adjusted, it is regulated
by idle stabilization
25 to 140 bar pressure
4.0 to 7.0 bar pressure

Depending on Engine Control Module (ECM) requirements.

Fastener Tightening Specifications
Component
Air guide 1)
Air guide 2)
Air guide with turbocharger recirculation valve -N249- to
throttle valve control module
Bracket for the fuel rail
Charge air cooler temperature sensor to throttle valve
control module
High pressure line
- Union nuts
- Connections
Fuel pressure sensor 2 to fuel rail 3)
High pressure pump to camshaft housing 5)
Intake manifold runner position sensor 2
Intake manifold to Bracket for the fuel rail 4)
Intake air temperature sensor to Intake manifold
Low fuel pressure sensor to high pressure pump
Manifold absolute pressure sensor to charge air cooler
housing
Threaded connection between high pressure line and
fuel rail
Throttle valve control module to charge air cooler
housing
Upper air filter housing to lower air filter housing
1)

2)

3)
4)
5

Nm
2.5
3.5
9
3
9

25
40
25
22
2.5
9
2.5
15
3
40
5
2.5

For bolt tightening clarification, refer to ElsaWeb, Air Filter Overview, items 1,2, 4
and 5.
For bolt tightening clarification, refer to ElsaWeb, Air Filter Overview, items 9 and
11.
Coat the threads with clean engine oil.
Fasten in diagonal sequence in steps
Replace

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 109

Engine –
4.0L CEUA, CGTA

Engine data
Idle speed

Ignition System – 4.0L CEUA, CGTA
Ignition Tightening Specifications
Component
Camshaft Position (CMP) sensor-to-engine
Engine Speed (RPM) sensor-to-engine
Knock Sensors (KS)-to-engine
Spark plug-to-engine
Wiring router-to-engine

Nm
9
9
9
25
5

Technical Data
Test data
Idle speed

4.0L TFSI Engine
Cannot be adjusted, it is regulated by idle
stabilization
Ignition timing
Not adjustable; regulated by the Engine Control
Module (ECM).
Ignition System
Single coil ignition system with 8 ignition coils
(output stages integrated) that are connected
directly to spark plugs via the ignition cables.
Spark plugs Names
Refer to the Parts Catalog
Removing Refer to the Maintenance Procedures Rep. Gr.
and
03
installing
Ignition sequence
1-5-4-8-6-3-7-2

110 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

Engine Mechanical – 6.3L CEJA
General, Technical Data

Engine –
6.3L CEJA

Engine Number Location

The engine number (Æ) (engine code and serial number)
is located at the front of the engine on the left side.

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 111

Engine Data
Identification codes
Displacement
liter
Output
kW at RPM
Torque
Nm at RPM
Bore
diameter mm
Stroke
mm
Compression ratio
RON
at least
Fuel injection and ignition system
Ignition sequence
Turbocharger
Knock control
Oxygen Sensor (O2S) regulation

Variable valve timing
Variable intake manifold
Secondary Air Injection (AIR) system
Valve per cylinder
1)

CEJA
6.299
368 @ 6400
550 @ 3250
86.0
90.368
11.4
98 1)
Bosch Motronic
1-7-5-11-3-9-6-12-2-8-4-10
No
4 sensors
4 sensors before catalytic
converter
4 sensors after catalytic
converter
Intake
Exhaust
No
Yes
4

Unleaded RON 95 is also permitted but performance is reduced.

Engine Assembly – 6.3L CEJA
Fastener Tightening Specifications
Component
Bolts and nuts

Engine support
Subframe nut

Fastener
size
M6
M7
M8
M10
M12
-

Nm
9
15
20
40
65
40
20

112 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

Step
1
2

Component
Tighten bolts (Æ) and 2