Quick Reference Service Bulletin/Repair Instructions

High Pressure Pump Tightening Specifications
Nm

Hand-tighten

11
•
March 2013
79
Ignition System – 3.0L CGXC, CTUB

Ignition Tightening Specifications

Component

Camshaft Position (CMP) sensor

Knock Sensors (KS)

Wiring for ignition coils at cylinder head cover
Nm

9

25

5
Technical Data

Test data

Engine idle speed

Ignition timing

Ignition/glow plug system
Spark plugs
Names

Removing

and

installing

Ignition sequence
80
3.0L TFSI Engine

Cannot be adjusted, it is regulated by idle

stabilization

Not adjustable; regulated by the Engine Control

Module (ECM).

Single coil ignition system with 8 ignition coils

(output stages integrated) that are connected

directly to the spark plugs via the ignition

cables.

Refer to Electronic Parts Catalog (ETKA).

Maintenance Procedures Rep. Gr.03

1-4-3-6-2-5
Audi A8/A8L/S8 Quick Reference Specification Book
•
March 2013
Engine Mechanical – 4.0L

CEUA, CGTA

General, Technical Data
Engine –

4.0L CEUA, CGTA
Engine Number Location
The engine number -arrow B- is visible, if the housing for the charge

air cooler is removed. The first 3 digits of the engine code -arrow

A- are visible, when the engine cover is removed. The 4-digit engine

code is on the type plate, vehicle data label and ECM.
Audi A8/A8L/S8 Quick Reference Specification Book
•
March 2013
81
Engine Data

Code letters

Displacement

Output

Torque
CEUA

3.999

309 @ 6000

600 @ 1500 to

4500

Bore

diameter mm

84.5

Stroke

mm

89.0

Compression ratio

10.1

RON

at least

98 1)

Fuel injection and ignition system

Bosch Motronic

Ignition sequence

1-5-4-8-6-3-7-2

Turbocharger

No

Oxygen Sensor (O2S) regulation

liter

kW at RPM

Nm at RPM
Variable valve timing

Variable intake manifold

Secondary Air Injection (AIR) system

Valve per cylinder

1)
CGTA

3.999

381 @ 6000

650 @ 1500 to

4500

84.5

89.0

10.1

98 1)

Bosch Motronic

1-5-4-8-6-3-7-2

No

4 Heated

Oxygen Sensors

(HO2S)

Yes

Yes

Yes

4
Unleaded RON 95 is also permitted but performance is reduced.
Engine Assembly – 4.0L CEUA, CGTA

Fastener Tightening Specifications

Component

Bolts and nuts
Engine bracket

Engine mount-to-engine support 1)

Engine support

Heat shield

Subframe

Wheel housing bracket bolt

1)
Fastener

size

M6

M7

M8

M10

M12

-
Nm

9

15

20

40

65

20

90 plus an

additional 90°

(¼ turn)

40

10

55

9
Replace fastener(s).
82
Audi A8/A8L/S8 Quick Reference Specification Book
•
March 2013
Crankshaft, Cylinder Block – 4.0L CEUA,

CGTA
Engine –

4.0L CEUA, CGTA
Allocation of Crankshaft Bearing Shells

for Cylinder Block – New Crankshaft
Bearing shells with the correct thickness are allocated to the

cylinder block in the factory. Colored dots on the sides of the

bearing shells identify the bearing shell thickness. The allocation

of the bearing shells to the cylinder block is marked by one letter

each at the front left on cylinder block as shown in the illustration.

Letter on cylinder block

R

S

G

U

B
Color of bearing

Red

Black

Yellow

Green

Blue
Audi A8/A8L/S8 Quick Reference Specification Book
•
March 2013
83
Allocation of Crankshaft Bearing

Shells for Guide Frame
Bearing shells with the correct thickness are allocated to the

guide frame in the factory. Colored dots on the sides of the

bearing shells identify the bearing shell thickness. The allocation

of bearing shells to the guide frame is identified by a letter

on the front crankshaft flange as shown in the illustration.

Letter on cylinder block

R

S

G

U

B

84
Color of bearing

Red

Black

Yellow

Green

Blue
Audi A8/A8L/S8 Quick Reference Specification Book
•
March 2013
Engine –

4.0L CEUA, CGTA
Allocation of Crankshaft Bearing Shells for Guide

Frame – Used and Reworked Crankshafts
Bearing shells are allocated to cylinder block corresponding to

the color markings stamped into the cylinder block. With used

and reworked crankshafts, measure the crankshaft pivot pins to

allocate the appropriate bearing shells. Thicker oversized bearing

shells are available for a reworked crankshaft. These have the

same color markings as the original size bearing shells.

Letter on cylinder block

R

S

G

U

B
Color of bearing

Red

Black

Yellow

Green

Blue
Audi A8/A8L/S8 Quick Reference Specification Book
•
March 2013
85
Fastener Tightening Specifications

Component

Drive plate-to-crankshaft 1)

Connecting rod bearing cap-to-connecting rod 1)

Idler roller for the ribbed belt

Oil spray jet for piston cooling 3)

Ribbed belt tensioning element

1)

2)
3)
2)
Nm

60 plus an

additional 90°

(¼ turn)

50 plus an

additional 90°

(¼ turn)

22

9

22

55
Replace fastener(s).

For bolt tightening clarification, refer to ElsaWeb, Ribbed Belt Drive Overview, items

1 and 2.

Insert bolts with locking compound
Spur Gear Unit Tightening Specifications
Step

1
86
Component
Nm
Tighten bolts 1 to 5 in a diagonal sequence
22
Audi A8/A8L/S8 Quick Reference Specification Book
•
March 2013
Engine –

4.0L CEUA, CGTA
Vibration Damper Tightening Specifications
Step
1)

2)
Component
Nm
1
Tighten bolts (Æ) in a diagonal sequence 1) 2)
15
2
Tighten bolts (Æ) in a diagonal sequence
22
3
Tighten bolts (Æ) in a diagonal sequence
an additional

90° (¼ turn)
Replace fastener(s).

Install the bolts with a locking compound. Refer to the Electronic Parts Catalog

(ETKA).
Audi A8/A8L/S8 Quick Reference Specification Book
•
March 2013
87
Baffle Plate Tightening Specifications
Step
1)
Component
1
Tighten bolts 1 through 6 in sequence 1)
2
Tighten bolts 1 through 6 in sequence
Nm

5

an additional

90° (¼ turn)
Replace fastener(s).
88
Audi A8/A8L/S8 Quick Reference Specification Book
•
March 2013
Engine –

4.0L CEUA, CGTA
Guide Frame Tightening Specifications
1)
Step

1
Component

Tighten bolts 1 through 10 in sequence 1)
Nm

30
2
Tighten bolts 11 through 20 in sequence 1)
30
3
Tighten bolts 1 through 10 in sequence
50
4
Tighten bolts 1 through 10 in sequence
4
Tighten bolts 11 through 20 in sequence
an additional

90° (¼ turn)

50
5
Tighten bolts 1 through 20 in sequence
6
Tighten guide frame to cylinder block sealing

surface bolts (not numbered) in a diagonal

sequence
an additional

90° (¼ turn)

9
Replace fastener(s).
Audi A8/A8L/S8 Quick Reference Specification Book
•
March 2013
89
Crankshaft Dimensions (Engine Code CEUA)

Honing dimension

in mm

Basic dimension
Crankshaft bearing

journal diameter

65.000

– 0.022

– 0.042

64.750

– 0.022

– 0.042
Repair stage
Connecting rod journal

diameter

54.000

– 0.022

– 0.042

53.750

– 0.022

– 0.042
Crankshaft Dimensions (Engine Code CGTA)

Honing dimension

in mm

Basic dimension
Crankshaft bearing

journal diameter

67.000

– 0.010

– 0.029

66.750

– 0.010

– 0.029
Repair stage
Connecting rod journal

diameter

54.000

– 0.022

– 0.042

53.750

– 0.022

– 0.042
Piston Ring End Gaps

Piston ring end gaps

dimensions in mm

1st compression ring

2nd compression ring

Oil scraping ring
New
Wear limit
0.20 to 0.35

0.20 to 0.40

0.20 to 0.40
0.80

0.80

0.80
Piston Ring Clearance (Engine Code CEUA)

Piston ring dimensions

in mm

1st compression ring

2nd compression ring

Oil scraping ring
New
Wear limit
0.020 to 0.070

0.005 to 0.045

0.020 to 0.055
0.200

0.150

0.200
Piston Ring Clearance (Engine Code CGTA)

Piston ring dimensions

in mm

1st compression ring

2nd compression ring

Oil scraping ring
New
Wear limit
0.026 to 0.058

0.020 to 0.045

0.011 to 0.028
not fixed

not fixed

not fixed
Piston and Cylinder Dimensions

Cylinder bore diameter in mm

84.510 ± 0.005

84.610 ± 0.005

1)
Piston diameter in mm

84.490 1)

84.590 1)

1...8 91011 12...49

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