NHTSA ID Number: 10205699
Manufacturer Communication Number: Quick Reference
TSB/Document Date: 2021-12-27
Summary
Quick reference specification book.
22
Audi
A8/A8L/S8 Quick Reference Specification Book • September 2013
Engine –
4.0L CEUA, CGTA
Vibration Damper Tightening Specifications
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 • September 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 • September 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 • September 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)
Measurement with graphite coating (thickness 0.01 mm). The graphite coating
wears away.
90
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
Cylinder Head, Valvetrain – 4.0L CEUA,
CGTA
Camshaft adjustment valve 2 to camshaft housing
Camshaft adjuster for the exhaust camshaft 1)
Camshaft adjuster for the intake camshaft 1)
Chain tensioner for the left camshaft control chain 1)
Chain Tensioner for the right camshaft timing chain 1)
Chain tensioner to engine 1)
Chain tensioner with glide track to engine 1)
Drive sprocket for the right camshaft timing chain 1)
Glide Track 1)
Gliding piece to engine 1)
Engine lifting eye to cylinder head
Exhaust camshaft adjustment valve 2 to camshaft
housing
Idler sprocket for the power take-off drive chain to engine
Intake/exhaust camshaft to cylinder head
Mounting pin to bearing plate 1)
1)
Nm
9
5 plus an
additional 90°
(¼ turn)
5
80 plus an
additional 90°
(¼ turn)
80 plus an
additional 90°
(¼ turn)
5 plus an
additional 90°
(¼ turn)
5 plus an
additional 90°
(¼ turn)
5 plus an
additional 90°
(¼ turn)
5 plus an
additional 90°
(¼ turn)
20 plus an
additional 45°
(⅛ turn)
17 plus an
additional 90°
(¼ turn)
5 plus an
additional 90°
(¼ turn)
22
5
42
5
5 plus an
additional 90°
(¼ turn)
Replace fastener(s).
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
91
Engine –
4.0L CEUA, CGTA
Fastener Tightening Specifications
Component
Bearing plate for drive sprocket
Bracket for idler sprocket 1)
Compression Checking Specifications
Compression pressure
New
Wear limit
Maximum difference between cylinders
Bar pressure
Engine Code
CEUA
10.0 to 15.0
9.0
3.0
Bar pressure
Engine Code
CGTA
10.0 to 14.0
8.0
3.0
Valve Dimensions
Dimension
Diameter a
mm
Diameter b
mm
c
mm
α
∠°
Intake valve
33.85 ± 0.10
5.98 ± 0.01
103.97 ± 0.20
45
Exhaust valve
28.0 ± 0.1
5.96 ± 0.01
101.9 ± 0.2
45
NOTE: Intake and exhaust valves must not be
refaced by grinding. Only lapping is permitted.
92
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
Engine –
4.0L CEUA, CGTA
Left Timing Chain Cover Tightening Specification
Replace any bolts that were tightened with an additional turn.
Step
1
Component
Tighten bolts 1 through 8 in sequence
Nm
5
2
Tighten bolts 1 through 8 in sequence
an additional
90° (¼ turn)
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
93
Right Timing Chain Cover Tightening Specification
Replace any bolts that were tightened with an additional turn.
Step
1
Component
Tighten bolts 1 through 8 in sequence
Nm
5
2
Tighten bolts 1 through 8 in sequence
an additional
90° (¼ turn)
94
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
Engine –
4.0L CEUA, CGTA
Lower Timing Chain Cover Tightening Specifications
Replace any bolts that were tightened with an additional turn.
Step
Nm
Tighten bolts (Æ)
5
2
Tighten bolts 2 through 8 in a diagonal
sequence)
Tighten bolts (Æ)
8
5
Tighten bolts 2 through 8 in a diagonal
sequence
Tighten bolts (Æ)
6
Tighten bolt 1)
an additional
90° (¼ turn)
an additional
90° (¼ turn)
Tighten for
power steering
pump
3
4
1)
Component
1
8
For bolt tightening clarification, refer to ElsaWeb, Suspension, Wheels, Steering;
Rep. Gr.48; Specifications
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
95
Cylinder Head Tightening Specifications
Replace any bolts that were tightened with an additional turn.
Step
96
Component
Nm
Hand-tighten
1
Tighten bolts 1 through 10 in sequence 1)
2
Tighten bolts 1 through 10 in sequence
3
Tighten bolts 1 through 10 in sequence
60
4
Tighten bolts 1 through 10 in sequence
5
Tighten bolts 1 through 10 in sequence
6
Tighten bolts (Æ)
an additional
90° (¼ turn)
an additional
90° (¼ turn)
10
7
Tighten bolts (Æ)
30
an additional
90° (¼ turn)
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
Engine –
4.0L CEUA, CGTA
Camshaft Housing Tightening Specifications
Replace any bolts that were tightened with an additional turn.
Step
Component
Nm
Hand-tighten 2)
1
Tighten bolts 1 through 22 in sequence
2
Tighten bolts 1 through 22 in sequence
8
3
Tighten bolts 1 through 22 in sequence
an additional
90° (¼ turn)
1)
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
97
Lubrication – 4.0L CEUA, CGTA
Fastener Tightening Specifications
Component
Cover in the inner V-to-engine 1)
Cover-to-upper oil pan
Drain plug-to-engine
Guide tube-to-upper oil pan
Intake tube for oil pump
Oil drain plug-to-lower oil pan
Oil drain plug-to-oil filter cap
Oil filter cap
Oil level thermal sensor-to-lower oil pan
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TSB/Document ID: Quick Reference
Replacement Service Bulletin Number:
MFR Communication Date: 2013-09-01
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
MFR Component System:
MFR Component Subsystem:
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