March 2013

Turbocharger, G-Charger– 4.0L CEUA,
CGTA
Fastener Tightening Specifications

Audi A8/A8L/S8 Quick Reference Specification Book

•

Nm
9
9
3.2
9
9
9
9
9
9
9
9

Engine –
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

2.5
9

March 2013

103

Left Turbocharger Tightening Specification

Step
1
2

104

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

Audi A8/A8L/S8 Quick Reference Specification Book

Nm
16
25

•

March 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

Audi A8/A8L/S8 Quick Reference Specification Book

Nm
16
25

•

March 2013

105

Turbocharger Support Tightening Specification

Step
1
2

106

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

Audi A8/A8L/S8 Quick Reference Specification Book

Nm
5
25

•

March 2013

Fuel Supply – 4.0L CEUA, CGTA
Fastener Tightening Specifications

Audi A8/A8L/S8 Quick Reference Specification Book

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

•

March 2013

Engine –
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

107

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

•

March 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

Engine –
4.0L CEUA, CGTA

Engine data
Idle speed

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

•

March 2013

109

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

•

March 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

•

March 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

112

Fastener
size
M6
M7
M8
M10
M12
-

Audi A8/A8L/S8 Quick Reference Specification Book

Nm
9
15
20
40
65
40
20

•

March 2013

Step
1
2

Component
Tighten bolts (Æ) and 2
Tighten bolts (Æ) and 2

Audi A8/A8L/S8 Quick Reference Specification Book

Nm
Hand-tighten
20

•

March 2013

113

Engine –
6.3L CEJA

Locking Flange Cover Tightening Specification

Crankshaft, Cylinder Block – 6.3L CEJA
Fastener Tightening Specifications
Component
Drive plate
Power steering pump bracket
Ribbed belt idler roller
Tensioning element with relay lever 1)
Tensioning roller tension spring
Vibration damper 1)

1)

Nm
60 plus an
additional 90°
(¼ turn)
40
32
32 plus an
additional 90°
(¼ turn)
23
40 plus an
additional 90°
(¼ turn)

Replace fastener(s).

Cylinder Head, Valvetrain – 6.3L CEJA
Fastener Tightening Specifications
Component
Camshaft adjustment valve in the exhaust
Camshaft drive chain sprocket 1)
Chain tensioner with tensioning rail for the drive chain
Camshaft adjustment control housing 1)
Engine lifting eye
Guide rail mounting pin
Cylinder bank 1 (right)
Camshaft adjuser 1)
Camshaft timing chain guide rail
Camshaft timing chain tensioner 1)
Guide rail mounting pin
Tensioning element mounting pin

114

Audi A8/A8L/S8 Quick Reference Specification Book

Nm
2.4
90 plus an
additional 135°
9
4 plus an
additional 90°
(¼ turn)
23
15
60 plus an
additional 90°
(¼ turn)
8 plus an
additional 90°
(¼ turn)
4 plus an
additional 90°
(¼ turn)
20
42

•

March 2013

Component
Timing chain tensioning element
Cylinder bank 2 (left)
Camshaft adjuster 1)

Nm
8
60 plus an
additional 90°
(¼ turn)
4 plus an
additional 90°
(¼ turn)
8 plus an
additional 90°
(¼ turn)
42
8

Camshaft timing chain tensioner 3)

Tensioning element mounting pin
Timing chain tensioning element 2)
1)
2)

3)

Replace fastener(s).
Install the bolts with a locking compound. Refer to the Electronic Parts Catalog
(ETKA).
For bolt tightening clarification, refer to ElsaWeb, Camshaft Timing Chains
Overview, Cylinder Bank 2 (left), items 1 and 7.

Compression pressure
New
Wear limit
Maximum difference between cylinders