NHTSA ID Number: 10203512
Manufacturer Communication Number: QRSB Audi
A8 A8L
TSB/Document Date: 2021-11-15
Summary
Quick reference specification book.
Turbocharger
Charge air cooler
Yes
Oxygen Sensor (O2S) regulation
Heated oxygen sensor (HO2S)
1
Particulate Filter
Yes
Selective Catalytic Reduction (SCR) Yes
catalytic converter
Valve per cylinder
4
Engine Assembly – 3.0L CPNA (TDI)
Fastener Tightening Specifications
Component
Bolts and nuts
Engine mount 1)
Engine support
Heat shield
Hydraulic hose mount nut
etaining plate for the engine mount bolt
Subframe bolt-to-retaining plate
1)
Fastener
size
M6
M7
M8
M10
M12
-
Nm
9
15
20
40
65
90 plus an
additional 90°
(¼ turn)
40
10
9
20
55
Replace fastener(s).
14
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
Crankshaft, Cylinder Block – 3.0L CPNA
Allocation of Crankshaft Bearing
Shells for Guide Frame
Letter on cylinder block
R
G
B
Engine –
3.0L CPNA (TDI)
Bearing shells with the correct thickness are allocated to the
guide frame in the factory. Colored dots on sides of bearing
shells serve for identifying bearing shell thickness. Allocation of
bearing shells to guide frame is marked on flywheel flange of
crankshaft by a row of letters. The first letter of the row of letters
represents bearing 1 the second letter is for bearing 2 etc.
Color of bearing
Red
Yellow
Blue
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
15
Allocation of Crankshaft Bearing
Shells for Cylinder Block
Bearing shells with the correct thickness are allocated to
the cylinder block in the factory. Colored dots on bearing
shells serve for identifying bearing shell thickness. Arrow:
belt pulley side. Allocation of bearing shells to cylinder
block is identified with a letter by each bearing.
Letter on cylinder block
R
G
B
16
Color of bearing
Red
Yellow
Blue
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
Fastener Tightening Specifications
Component
Bracket for assemblies
Tighten in 2 steps:
5 Nm diagonally
40 Nm diagonally
Bracket for the generator
Tighten in 2 steps:
5 Nm diagonally
40 Nm diagonally
Bracket for idler roller
Connecting rod bearing cap bolts 1) 2)
Cover to sealing flange bolt
Connecting rod bearing cap 1)
Idler Roller For the ribbed belt
Oil dipstick guide tube
Piston cooling oil spray jet
Tensioner for the ribbed belt 1
Vibration damper to crankshaft 1)
1)
-
23
35 plus an
additional 90°
(¼ turn)
9
60 plus an
additional 90°
(¼ turn)
23
9
9
50 plus an
additional 90°
(¼ turn)
20 plus an
additional 90°
(¼ turn)
Replace fastener(s).
Lubricate the thread and contact surface.
Engine –
3.0L CPNA (TDI)
2)
Nm
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
17
Guide Frame Tightening Specifications
Replace any bolts that were tightened with an additional turn.
Step
18
Component
Nm
1
Tighten bolts 1 through 16 in sequence
30
2
Tighten bolts 1 through 16 in sequence
50
3
Tighten bolts 1 through 16 in sequence
an additional
180° (½ turn)
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
Ribbed Belt Pulley Side Sealing Flange
Tightening Specifications
Replace any bolts that were tightened with an additional turn.
Tighten the bolts in 11 steps in the sequence shown.
Steps 1 to 3:
1
Component
Nm
Attach the sealing flange with the seal to the cylinder block
2
Tighten bolt 1
3
Tighten bolts 2 through 4 in sequence
23
Tighten M6x20
to 9 Nm
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
19
Engine –
3.0L CPNA (TDI)
Ribbed Belt Pulley Side Sealing Flange
Tightening Specifications (cont'd)
Steps 4 to 8:
Step
4
20
Component
Nm
5
Insert a temperature regulator for the engine oil cooler with the
cover
Tighten bolt 10
Hand-tighten
6
Tighten bolts 1 through 19 in sequence
3
7
Tighten bolts 1 through 19 in sequence
3
8
Tighten bolts 1 through 19 in sequence
90 plus an
additional 90°
(¼ turn)
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
Ribbed Belt Pulley Side Sealing Flange
Tightening Specifications (cont'd)
Steps 9 to 11:
Component
9
Tighten bolts 2 through 4 in sequence
10
Tighten bolts 2 through 4 in sequence
11
Tighten bolts 2 through 4 in sequence
Nm
Remove the steel
bolts M6x20
Insert the
aluminum bolts
and tighten to 3
Nm
Turn the aluminum
bolts 90 plus an
additional 90° (¼
turn)
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
21
Engine –
3.0L CPNA (TDI)
Crankshaft Dimensions
Honing dimension
in mm
Basic dimension
Crankshaft bearing
journal diameter
65.000
– 0.022
– 0.042
Connecting rod journal
diameter
54.000
– 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
0.25 to 0.40
0.70 to 0.90
0.25 to 0.50
0.60
1.20
0.70
Piston Ring Clearance
Piston ring dimensions
in mm
1st compression ring
2nd compression ring
Oil scraping ring
New
Wear limit
0.009 to 0.130
0.05 to 0.09
0.03 to 0.07
0.160
0.11
0.10
Piston and Cylinder Dimensions
Nominal dimension
Repair stage
1)
2)
Cylinder bore diameter
in mm
83.006 to 83.014 1)
83.046 to 83.054 1)
Piston diameter in
mm
82.924 to 82.936 2)
82.964 to 82.976 2)
Measure 50 mm inside the cylinder bore..
Measurement with graphite coating (thickness 0.02 mm). The graphite coating
wears away.
22
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
Cylinder Head, Valvetrain – 3.0L CPNA
Fastener Tightening Specifications
Component
Balance shaft nut 3)
Balance weight bolt
Bracket to cylinder head bolt
Camshaft chain sprocket bolt
Chain tensioner for camshaft timing chain bolt 1)
Chain tensioner with glide track bolt 1)
Drive chain sprocket for the balance shaft bolt
Drive chain sprocket for the oil pump bolt 1)
Gear carrier bolt 2)
Glide track bolt 1)
Gide track guide pin 1)
Heat shield to cylinder head cover bolt
Jump protector bolt
Engine lifting eye to cylinder head bolt
1)
2)
3)
Nm
30 plus an
additional 90°
(¼ turn)
60
23
23
5 plus an
additional 90°
(¼ turn)
5 plus an
additional 90°
(¼ turn)
23
30 plus an
additional 45°
(⅛ turn)
9
5 plus an
additional 90°
(¼ turn)
5 plus an
additional 90°
(¼ turn)
9
9
23
Replace fastener(s).
Insert with locking compound.
After loosening the nut, the balance shaft must be replaced
Bar pressure
28 to 33
21
5
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
23
Engine –
3.0L CPNA (TDI)
Compression Checking Specifications
Compression pressure
New
Wear limit
Maximum difference between cylinders
Valve Dimensions
Dimension
Diameter a
mm
Diameter b
mm
c
mm
α
∠°
Intake valve
28.5 to 28.7
5.968 to 5.982
97.2 to 97.4
45° 10'
Exhaust valve
25.9 to 26.1
5.958 to 5.972
99.0 to 99.2
45° 10'
NOTE: Intake and exhaust valves must not be
refaced by grinding. Only lapping is permitted.
24
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
Upper Timing Chain Cover Tightening Specification
Replace any bolts that were tightened with an additional turn.
Steps Component
1
Tighten bolts 1 through 3 in sequence
2
Tighten bolts 4 through 7 in sequence
Nm
Hand-tighten
Hand-tighten
Tighten bolts 1 through 7 in sequence
8
Tighten bolts 1 through 7 in sequence
8
5
Tighten bolts 1 through 7 in sequence
an additional
90° (¼ turn)
Engine –
3.0L CPNA (TDI)
3
4
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
25
Lower Timing Chain Cover Removing Sequence
Remove the bolts in the following sequence 24 to 1.
26
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
Lower Timing Chain Cover Tightening Specification
Replace any bolts that were tightened with an additional turn.
Steps 1 and 2
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
Engine –
3.0L CPNA (TDI)
Steps Component
Nm
1
Attaching the timing chain guard lower section with the sealant
and the sealing pieces to the cylinder block
2
Tighten bolts 1 through 4 in sequence
9
27
Lower Timing Chain Cover
Tightening Specification (cont'd)
Replace any bolts that were tightened with an additional turn.
Steps 3 to 6
Steps Component
28
Nm
3
Tighten bolts 1 through 20 in sequence
3
4
Tighten bolts 1 through 20 in sequence
3
5
Tighten bolts 1 through 20 in sequence
8
6
Tighten bolts 1 through 20 in sequence
an additional
90° (¼ turn)
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
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TSB/Document ID: QRSB Audi A8 A8L
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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