1 to 3

Install all the way in by hand.

2

1 to 3

8 Nm

3

1 to 3

Tighten 90° additional turn

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129

Cooling System – 3.0L CPNB (TDI)
Fastener Tightening Specifications
Component
Bracket for coolant auxiliary cooler bolt
- Bolt
- Nut
Bracket to coolant auxiliary cooler bolt
Check valve bolt
Coolant connection bolt
Coolant fan control module to fan shroud bolt
Coolant pipes 2)
- Bolt
- Banjo Bolt
Coolant pump to engine bolt 1)

Nm
20
8
3.5
9
9
2.5
9
12
3 plus an
additional 90°
(¼ turn)
23
9
9
9
5
9

Coolant pump ribbed belt pulley to coolant pump bolt
Coolant shut-off valve to mounting plate bolt
Engine coolant temperature sensor bolt
Engine temperature control sensor bolt
Fan shroud to coolant fan bolt
Front coolant pipe bolt
Left rear coolant pipe bolt 3)
- Bolt
- Bolt
Radiator bracket 4)
- Bolt
- Bolt
Upper coolant pipe bolt
1)
2)

3)

4)

9
20
4.5
5
9

Tighten diagonally in steps
For bolt tightening clarification, refer to ElsaWeb, Coolant Pipes Overview, items 13,
15 and 16.
For bolt tightening clarification, refer to ElsaWeb, Coolant Pipes Overview, items 22
and 24.
For bolt tightening clarification, refer to ElsaWeb, Radiator Overview items 18 and
20.

130

Audi A6/S6 Quick Reference Specification Book

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September 2013

Fuel Supply – 3.0L CPNB (TDI)
Fastener Tightening Specifications
Component
Accelerator pedal module to bracket bolt
Fuel filter bracket nut
Fuel filler neck to fender bolt
Fuel pump control module bolt
Heat shield to fuel tank bolt
Locking flange cover screw
Locking ring
Mounting strap to body bolt
Reducing agent filler tube bolt

Nm
8
2.1
20
1.6
2
1.5
110
20
2.5

Engine –
3.0L TDI CPNB

Turbocharger, G-Charger – 3.0L CPNB
(TDI)
Fastener Tightening Specifications
Component
Bracket for connector and engine cover to turbocharger
Bracket for turbocharger bolt 1)
Bracket for turbocharger stud bolt 2)
Charge air cooler
Charge air pressure sensor/intake air temperature
sensor bolt
Clamp 13 mm wide
Clamp 9 mm wide
Connection to turbocharger bolt
Right air guide pipe bolt
1)
2)

Nm
9
23
10
7
5
5.5
3.4
9
9

Tighten last to 23 Nm diagonally and in steps.
Replace nuts after each time they are loosened.

Audi A6/S6 Quick Reference Specification Book

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September 2013

131

Turbocharger - Tightening
Specification and Sequence

Tighten the bolts and nuts in seven steps in the sequence shown.
Replace the stud bolts and nuts.
Step

Bolts

1

10 Nm

2

Stud bolts for
the nuts -1,
and 21 and 2

3

1 and 2

9 Nm

4

1 and 2

Tighten 90° additional turn

5

3, 4 and 5

6

3 and 4

9 Nm

7

56

23 Nm

132

Tightening specification/additional turn

Install all the way in by hand.

Install all the way in by hand.

Audi A6/S6 Quick Reference Specification Book

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September 2013

Exhaust System, Emission Controls – 3.0L
CPNB (TDI)
Fastener Tightening Specifications

NOx sensor control module 2 with NOx sensor 2
- Bolt
- Nut
Particulate filter with catalytic converter nut 1) 2)
Particulate sensor
- Bolt
- Nut
Pressure line for the differential pressure sensor
Pressure pipe for differential pressure sensor
Reducing agent metering system control module to base
plate bolt
Suspended mount bolt
Selective Catalytic Reduction (SCR) - catalytic converter
to front exhaust pipe nut
Tank For the reducing agent bolt
1)
2)

Nm
5
23
23
9
2
9
9
35
45
9
30 plus an
additional 90°
(¼ turn)
50
2
23
45
2
45
45
4.5
23
23
20

Replace fastener(s).
Coat the thread with hot bolt paste.

Audi A6/S6 Quick Reference Specification Book

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September 2013

133

Engine –
3.0L TDI CPNB

Component
Clamp for front exhaust pipe to reducing agent injector
bolt
Clamping sleeve nut
Connection to EGR cooler bolt
Coolant connection bolt
Cover for the reducing agent tank to tank
EGR cooler bolt
EGR motor to connection bolt
EGR temperature sensor
- Aluminum exhaust gas recirculation radiator bolt
- Steel exhaust gas recirculation radiator bolt
Engine coolant temperature sensor bolt
Exhaust manifold bolt 1) 2)

Exhaust Manifold - Tightening
Specification and Sequence

Replace the nuts. Coat the thread on the nut with hot bolt paste.
Refer to the Parts Catalog. Tighten the nuts in 3 steps according to
the tightening sequence:
Step

Bolts

1
2

Stud bolts for
the nuts -1,
and 21 and 2

3

1 and 2

134

Tightening specification
Install all the way in by hand.
15 Nm
25 Nm

Audi A6/S6 Quick Reference Specification Book

•

September 2013

Replace the nuts. Coat the thread on the nut with hot bolt paste.
Refer to the Parts Catalog. Tighten the nuts in 3 steps according to
the tightening sequence:
Step

Bolts

Tightening specification

1

2 and 3

2

1

3

2 and 3

Turn them by hand until the bolt heads are
touching
Position using the tab on the EGR pipe tightening
specification.
• Part number 059 131 548 C: 5 Nm
• Part number 059 131 548 D: 3.5 Nm
5 Nm

4

2 and 3

Tighten 90° additional turn

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September 2013

135

Engine –
3.0L TDI CPNB

EGR Pipe at the Turbocharger - Tightening
Specification and Sequence

Exhaust Gas Recirculation (EGR) Pipe at the Intake
Manifold - Tightening Specification and Sequence

The flange at the EGR pipe must not be wavy or bent. Attach the
EGR pipe with the seals and the screw-type clamps. Coat the thread
on the bolts with hot bolt paste; for the correct hot bolt paste refer to
the Parts Catalog.
Step

Bolts

1

1 and 2

2

3

3

1 and 2

136

Tightening specification
Turn them by hand until the bolt heads are
touching
Position them as shown in the illustration
2.5 Nm
9 Nm

Audi A6/S6 Quick Reference Specification Book

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September 2013

Multiport Fuel Injection – 3.0L CPNB (TDI)
Fastener Tightening Specifications

Wiring guide to intake manifold bolt
1)
2)

Nm
70
1.5
9
9
4
9
2.5
9
4.5
22
25
2
25
22
9
5
3.5
2
55
2
9

Engine –
3.0L TDI CPNB

Component
Adapter to high pressure pump bolt
Air guide bolt
Air guide pipe to intake flap motor bolt
Bracket for the air guide pipe bolt
Bracket for the connector to intake manifold bolt
Clamp the high pressure line bolt
Counter pin
- On camshaft bearing
- On cylinder head
Differential pressure sensor
Fuel rail bolt
Fuel return hose to fuel rail banjo bolt
Fuel temperature sensor
High pressure line
High pressure pump bolt
Intake flap motor to intake manifold bolt
Intake manifold mounting pins to cover bolt
Mass airflow sensor bolt
NOx sensor control module with NOx sensor nut
Oxygen sensor 2)
Particle sensor nut
Pipe for the exhaust gas recirculation to air guide pipe
bolt
Pressure line for exhaust pressure sensor 1)
Tensioning Claw 1)
- First tightening
- Second tightening

45
6
Tighten 90°
additional turn
4

Replace
Coat threads with hot bolt paste

Audi A6/S6 Quick Reference Specification Book

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September 2013

137

Intake Manifold - Tightening
Specification and Sequence

Tighten the bolts in 3 steps as follows:
Step

Bolts

1

1 through 4,
arrows
1 through 4

Install all the way in by hand.

1 through 4
and arrows

9 Nm in any sequence

2
3

138

Tightening specification

5 Nm in sequence shown

Audi A6/S6 Quick Reference Specification Book

•

September 2013

Align the Fuel Pressure Regulator Valve -N276- such that connecting
the harness connector -arrow- does not cause the electrical wiring to
be placed under tension. Counterhold the housing hex bolt to tighten
union nut on regulator valve in four stages as follows:
Step

Tightening specification

1

Install all the way in by hand.

2

60 Nm

3

Turn back 90°

4

85 Nm

Audi A6/S6 Quick Reference Specification Book

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September 2013

139

Engine –
3.0L TDI CPNB

Fuel Pressure Regulator Valve -N276- Tightening Specification

Fuel Pressure Sensor -G247Tightening Specifications

Tighten the Fuel Pressure Sensor -G247- in four steps:
Step

Tightening specification

1

Install all the way in by hand.