NOTE: The left cylinder head camshaft guide frame is shown.
The right cylinder head camshaft guide frame is identical.
Step
1
2
3
1)
2)

Component
Tighten bolts 1 through 22 in sequence 1) 2)

Nm
Hand-tighten

Tighten bolts 1 through 22 in sequence
Tighten bolts 1 through 22 in sequence

8
an additional
90° (¼ turn)

Replace fastener(s)
The camshaft housing contact surface must lay entirely on top of the cylinder head

Audi A6/S6 Quick Reference Specification Book

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September 2013

89

Lubrication – 4.0L CEUC
Fastener Tightening Specifications
Component
Bracket nut
Bracket for right engine oil cooler
- Bolt
- Nut
Charge air cooler housing
Cover to upper oil pan
Cover in the inner V-to-engine 1)

Nm
8
8
20
9
8
5 plus an
additional 90°
(¼ turn)
30
9
9
25
4
20
9
8 plus an
additional 90°
(¼ turn)
9
20
8 plus an
additional 90°
(¼ turn)
3.2
9
3.2
20

Drain plug-to-engine
Guide tube for the oil dipstick-to-upper oil pan
Intake tube for the oil pump-to-oil pump
Oil cap to lower engine
Oil drain plug-to-cap
Oil drain plug-to-lower oil pan
Oil level thermal sensor-to-lower oil pan
Oil pipe-to-oil pump 1)
Oil pressure regulation valve-to-engine
Oil pressure switch-to-engine
Oil pump-to-engine 1)
Oil separator-to-charge air cooler housing
Oil temperature sensor 2-to-engine double bolt
Pipe for the crankcase ventilation
Reduced oil pressure switch-to-engine
1)

Replace fastener(s).

90

Audi A6/S6 Quick Reference Specification Book

•

September 2013

Engine –
4.0L CEUC

Upper Oil Pan Tightening Specifications

Step
1
2
3

Component

Nm

Tighten bolts 1 through 7 in a diagonal
sequence
Tighten bolts 1 through 7 in a diagonal
sequence
Tighten bolts 1 through 7 in a diagonal
sequence

Audi A6/S6 Quick Reference Specification Book

Hand-tighten
5
an additional
90° (¼ turn)

•

September 2013

91

Lower Oil Pan Tightening Specifications

Step
1
2
3

92

Component
Bolts arrows in a diagonal sequence
Bolts arrows in a diagonal sequence
Bolts arrows in a diagonal sequence

Audi A6/S6 Quick Reference Specification Book

Nm
Hand-tighten
8
an additional
90° (¼ turn)

•

September 2013

Engine –
4.0L CEUC

Oil Cooler Tightening Specifications

Step

Component

Nm

1

Tighten bolts 1 through 7 in sequence

3

2

Tighten bolts 1 through 7 in sequence

9

Cooling System – 4.0L CEUC
Fastener Tightening Specifications
Component
After-run coolant pump to bracket bolt
Air guide bolt/nut (Audi RS6/RS7)
Bracket (Audi RS6/RS7) 6)
- Bolt
- Nut
Bracket bolt/nut
Bracket bolt (Audi S6/S7)
Bracket bolt (Audi RS6/RS7)
Bracket to after-run coolant pump bolt
Bracket to frame bolt (Automatic Transmission)
Bracket to frame bolt (S tronic Transmission)
Bracket to front radiator coolant circuit for atf cooling bolt
(Audi RS6/RS7)
Bracket to radiator coolant circuit for ATF cooling (Audi S6/S7) 4)
- Bolt
Audi A6/S6 Quick Reference Specification Book

•

Nm
9
5
20
9
9
5
5
1.5
9
9
3.5

3.5

September 2013

93

Fastener Tightening Specifications (cont'd)
Component
- Nut
- Bolt
Bracket to right engine oil cooler (Audi RS6/RS7)
- Bolt
- Bolt
Bracket to transmission fluid cooling valve bolt
(Automatic Transmission)
Bracket to transmission fluid cooling valve bolt (S tronic
Transmission)
Bracket for charge air cooling pump nut
Bracket for engine coolant circulation pump 2 5)
- Bolt
- Bolt
Coolant connection bolt
Coolant pipe nut
Coolant pump housing bolt 1)

Nm
8
20
3.5
8
9
9
9
1.5
9
9
9
8 plus an
additional 90°
(¼ turn)
5 plus an
additional 90°
(¼ turn)
7
5
9
9
3.5
5
7
9
9
9
9

Coolant shut-off valve bolt 1)
Cooler for charge air cooling circuit bolt (Audi S6/S7)
Cooler for charge air cooling circuit bolt (Audi RS6/RS7)
Engine coolant temperature sensor-to-engine
Engine temperature control sensor-to-engine
Fan shroud-to-coolant fan
Fan wheel-to-fan shroud
Front charge air cooling circuit radiator-to-radiator
Front coolant pipe-to-engine
Lower left coolant pipe-to-engine
Lower left coolant pipe-to-subframe
Map controlled engine cooling thermostat-to-housing for
the coolant pump
Radiator bracket-to-radiator 2)

4.5
5

Radiator bracket (Audi RS6/RS7) 3
- Bolt
- Bolt
Rear radiator coolant circuit for atf cooling to bracket nut
(Audi RS6/RS7)
Right coolant pipe bolt/nut
Right coolant pipe on the transmission bolt (Automatic
Transmission)
94

Audi A6/S6 Quick Reference Specification Book

7
18
9
9
9
•

September 2013

1)
2)

3)

4)

5)

6)

Nm
9
9
4.5
8
3.5
9
9

Replace fastener(s)
For bolt tightening clarification, refer to ElsaWeb, Radiator, Right Auxiliary Cooler
Overview, Audi RS6/RS7 and see items 6 and 8
For bolt tightening clarification, refer to ElsaWeb, Radiator Overview, Audi RS6/RS7
and see items 21 and 25
For bolt tightening clarification, refer to ElsaWeb, Radiator, Radiator Coolant Circuit
for ATF Cooling Overview, Audi S6/S7 and see items 2, 6 and 7
For bolt tightening clarification, refer to ElsaWeb, Radiator, Radiator Coolant Circuit
for ATF Cooling Overview, Audi RS6/RS7“and see items -7, 11 and 12
For bolt tightening clarification, refer to ElsaWeb, Engine Coolant Circulation Pump
2 -V178- Overview and see items 3 and 5

Fuel Supply – 4.0L CEUC
Fastener Tightening Specifications
Component
Accelerator pedal module
Air filter housing nut
Bolt for fecuring the fuel filler neck
Carrier plate
Evaporative Emission (EVAP) canister 2)
Fuel tank
Fuel tank leak detection control module-to-EVAP canister
Fuel pump control module
Heat shield lock washer
Locking flange cover
Locking ring
Protective plate for fuel filler tube 1)
Suspended mount for exhaust system
1)

2)

Nm
8
8
20
20
1.5
20
20
1.5
1.6
2
1.5
110
3.5
20
20

For bolt tightening clarification, refer to ElsaWeb, Fuel Tank with Attachments
Overview, items 8, 9 and 13.
For bolt tightening clarification, refer to ElsaWeb, EVAP System Overview, items 2,
3 and 14.

Audi A6/S6 Quick Reference Specification Book

•

September 2013

95

Engine –
4.0L CEUC

Component
Right coolant pipe on the transmission bolt (S tronic
Transmission)
Right coolant pipe-to-engine
Rubber buffer to radiator bracket bolt (Audi S6/S7)
Rubber buffer to radiator bracket bolt (Audi RS6/RS7)
Rubber bushing to bracket bolt (Audi RS6/RS7)
Upper left coolant pipe-to-engine nut
Upper rear coolant pipe-to-engine

Turbocharger, G-Charger – 4.0L CEUC
Fastener Tightening Specifications
Component
Air guide-to-throttle valve control module
Air guide-to-turbocharger
Ball pin for engine cover
Bank 2 turbocharger recirculation valve-to-air guide
Charge air cooler-to-charge air cooler housing
Charge air cooler housing-to-body
Charge air pressure sensor-to-air guide
Clamp 9 mm wide
Clamp 13 mm wide
Connection for oil return hose-to-turbocharger
Coolant supply pipe-to-turbocharger
Engine cover temperature sensor
Oil supply pipe-to-turbocharger
Retaining plate for coolant and oil lines-to-turbocharger
Structure-borne sound actuator
Turbocharger recirculation valve-to-air guide
Vacuum actuator-to-turbocharger
- Ball pin
- Bolt

96

Audi A6/S6 Quick Reference Specification Book

Nm
9
9
2.5
9
3.2
9
9
3.4
5.5
9
9
9
9
9
9
9
2.5
9

•

September 2013

Engine –
4.0L CEUC

Left Turbocharger Tightening Specifications

Step

Component

Nm

1

Tighten bolts 1 through 8 in sequence

16

2

Tighten bolts 1 through 8 in sequence

25

Audi A6/S6 Quick Reference Specification Book

•

September 2013

97

Right Turbocharger Tightening Specifications

Step

98

Component

Nm

1

Tighten bolts 1 through 8 in sequence

16

2

Tighten bolts 1 through 8 in sequence

25

Audi A6/S6 Quick Reference Specification Book

•

September 2013

Engine –
4.0L CEUC

Turbocharger Support Tightening Specifications

Step

Component

Nm

1

Tighten bolts 1 through 3 in sequence

5

2

Tighten bolts 1 through 3 in sequence

25

Audi A6/S6 Quick Reference Specification Book

•

September 2013

99

Exhaust System, Emission Controls – 4.0L
CEUC
Fastener Tightening Specifications
Component
Bracket secondary air injection pump motor-to-body
Catalytic converter-to-exhaust manifold nut 1) 2)
Clamping sleeve nut
Connection flange-to-left secondary air injection
combination valve
Connection flange-to-right secondary air injection
combination valve
Exhaust door control unit
Front muffler-to-catalytic converter nut 1) 2)
Suspended mount bolt 3)
Suspended mount bolt 4)
1)
2)
3)
4)

Nm
9
23
23
9
9
3
23
20
23

Replace
Coat the thread with hot bolt paste.
For bolt tightening clarification, refer to ElsaWeb, Muffler Overview and see item 3
For bolt tightening clarification, refer to ElsaWeb, Muffler Overview and see items
15 and 18.

100

Audi A6/S6 Quick Reference Specification Book