Cylinder Block
0.82 to 0.92 mm
0.92 to 0.97 mm
0.97 to 1.08 mm

Audi A6/S6 Quick Reference Specification Book

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Identification Holes
1
2
3

September 2013

113

Engine –
3.0L TDI CPNB

Piston Ring Clearance

Cylinder Head, Valvetrain – 3.0L CPNB
(TDI)
Fastener Tightening Specifications
Component
Balance weight belt pulley side to balance shaft bolt
Balance weight transmission side to balance shaft nut 2)

Nm
60
30 plus an
additional 90°
(¼ turn)
23
23
5 plus an
additional 90°
(¼ turn)
5 plus an
additional 90°
(¼ turn)
12
30 plus an
additional 45°
(⅛ turn)
23
23
9
5 plus an
additional 90°
(¼ turn)
9

Bracket to cylinder head bolt
Camshaft chain sprocket bolt
Chain tensioner for the camshaft timing chain bolt 1)
Chain tensioner with glide track bolt 1)
Coolant pipes banjo bolt
Drive chain sprocket for the oil pump bolt 1)
Drive chain sprocket to balance weight bolt
Engine lifting eye bolt
Gear carrier bolt
Guide rail guide pin 1)
Jump protector bolt
1)
2)

Replace fastener(s).
After loosening the nut, the balance shaft must be replaced

Compression Checking Specifications
Compression pressure
New
Wear limit
Maximum difference between cylinders

114

Audi A6/S6 Quick Reference Specification Book

Bar pressure
28 to 33
21
5

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September 2013

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

Exhaust valve
25.9 to 26.1
5.958 to 5.972
99.0 to 99.2

45° 10'

45° 10'

Engine –
3.0L TDI CPNB

Valve Dimensions

NOTE: Intake and exhaust valves must not be
refaced by grinding. Only lapping is permitted.

Audi A6/S6 Quick Reference Specification Book

•

September 2013

115

Lower Timing Chain Cover Tightening Specifications

Tighten the bolts in multiple steps in the sequence shown.
Replace any bolts that were tightened with an additional turn.
Steps 1 and 2:
Step
1

Bolts

2

1, 2, 3,
and 4

116

Tightening Specification/Additional Turn
Attaching the timing chain guard lower section with
the sealant and the sealing pieces to the cylinder
block
Tighten the M6x20 to 9 Nm

Audi A6/S6 Quick Reference Specification Book

•

September 2013

Engine –
3.0L TDI CPNB

Lower Timing Chain Cover Tightening
Specifications (cont'd)

Steps 3 to 6:
Step
3
4

Bolts
1 to 20
1 to 20

5
6

1 to 6
1 to 20

Tightening Specification/Additional Turn
3 Nm
3 Nm - this measurement takes into account the
lower timing chain cover shrinkage.
8 Nm
Tighten 90° additional turn

Audi A6/S6 Quick Reference Specification Book

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September 2013

117

Lower Timing Chain Cover Tightening
Specifications (cont'd)

Steps 7 to 9:
Step
7
8
9

118

Bolts
1, 2, 3,
and 4
1, 2, 3,
and 4
1, 2, 3,
and 4

Tightening Specification/Additional Turn
Remove the steel bolts M6x20
Insert the aluminum bolts and tighten to 3 Nm
Turn the aluminum bolts 90° further

Audi A6/S6 Quick Reference Specification Book

•

September 2013

Engine –
3.0L TDI CPNB

Upper Timing Chain Cover Tightening Specifications

Tighten the bolts in five steps in the sequence shown.
Replace any bolts that were tightened with an additional turn.
Step
1
2
3
4

Bolts
1, 2, and 3
4 to 7
1 to 7
1 to 7

5

1 to 7

Tightening Specification/Additional Turn
Install all the way in by hand.
Install all the way in by hand.
8 Nm
8 Nm - this measurement takes into account the
timing chain guard shrinkage.
Tighten 90° additional turn

Audi A6/S6 Quick Reference Specification Book

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September 2013

119

Cylinder Bank 1 (right) Bearing Cap Tightening Specification and Sequence

Step
1
2
1)

Bolts
1 to 12
1 to 12

Tightening Specification/Additional Turn
Install all the way in by hand.
9 Nm

Replace fastener(s) except bolt 3.

120

Audi A6/S6 Quick Reference Specification Book

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September 2013

Engine –
3.0L TDI CPNB

Cylinder Bank 2 (left) Bearing Cap Tightening Specification and Sequence

NOTE: The left cylinder head is shown.
The right cylinder head is identical.
Step
1
2

Bolts
1 to 12
1 to 12

Tightening Specification/Additional Turn
Install all the way in by hand.
9 Nm

Audi A6/S6 Quick Reference Specification Book

•

September 2013

121

Cylinder Head, Loosening Bolts

Loosen the cylinder head bolts in the sequence -1 to 8

122

Audi A6/S6 Quick Reference Specification Book

•

September 2013

Tighten the bolts in five steps in the sequence shown. Replace
any bolts that were tightened with an additional turn.
Step
1

Bolts
1 to 8

Tightening Specification/Additional Turn
Install all the way in by hand.

2
3

1 to 8
1 to 8

35 Nm
70 Nm

4

1 to 8

an additional 90° (¼ turn)

5

1 to 8

an additional 90° (¼ turn)

Audi A6/S6 Quick Reference Specification Book

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September 2013

123

Engine –
3.0L TDI CPNB

Cylinder Head - Tightening
Specification and Sequence

Left Cylinder Head Cover Tightening Specification

Tighten the bolts in three steps in the sequence shown.
Replace any bolts that were tightened with an additional turn.
Step
1
2
3

124

Bolts
1 to 7
1 to 7
1 to 7

Tightening Specification/Additional Turn
Install all the way in by hand.
8 Nm
Tighten 90° additional turn

Audi A6/S6 Quick Reference Specification Book

•

September 2013

Right Cylinder Head Cover Tightening Specification

Step
1
2
3

Bolts
1 to 7
1 to 7
1 to 7

Engine –
3.0L TDI CPNB

Tighten the bolts in three steps in the sequence shown.
Replace any bolts that were tightened with an additional turn.
Tightening Specification/Additional Turn
Install all the way in by hand.
8 Nm
Tighten 90° additional turn

Audi A6/S6 Quick Reference Specification Book

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September 2013

125

Lubrication – 3.0L CPNB (TDI)
Fastener Tightening Specifications
Component
Chain sprocket for the oil pump to input shaft bolt 1)
Coolant shut-off valve to mounting plate bolt
Cover to oil filter housing
Engine oil cooler to mounting plate
Guide tube for the oil dipstick to engine bolt
Intake line to oil pump bolt
Mounting plate for the engine oil cooler bolt
Oil baffle bolt 1)
Oil drain plug
Oil filter housing bolt
Oil pan upper section drain plug 2)
Oil pressure regulation valve to oil pan upper section bolt
Oil pressure switch
Oil pump to oil return pipe bolt
Oil return pipe to oil pump bolt
Reduced oil pressure switch
Vacuum line from the vacuum pump
- Bolt
- Bolt 1)

1)
2)
3)

Nm
30 plus an
additional 45°
(⅛ turn)
9
35
9
9
9
9
3 plus an
additional 90°
(¼ turn)
30
9
25
9
20
9
9
20
9
3 plus an
additional 45°
(⅛ turn)

Replace fastener(s).
For Top Dead Center (TDC) marking
For bolt tightening clarification, refer to ElsaWeb, Oil Pan Upper Section Overview
and see items -19 and 21.

126

Audi A6/S6 Quick Reference Specification Book

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September 2013

Engine –
3.0L TDI CPNB

Upper Oil Pan Section Tightening Specifications

Step

Bolts

1

1 to 12

2 Nm

Tightening specification/additional turn

2

1 to 12

5 Nm

3

1 to 12

Tighten 90° additional turn

Audi A6/S6 Quick Reference Specification Book

•

September 2013

127

Lower Oil Pan Tightening Specifications

Tighten the bolts in three steps in the sequence shown.
Replace any bolts that were tightened with an additional turn.
Step

Bolts

1

1 to 15

2 Nm

2

1 to 15

5 Nm

3

1 to 15

Tighten 90° additional turn

128

Tightening specification/additional turn

Audi A6/S6 Quick Reference Specification Book

•

September 2013

Engine –
3.0L TDI CPNB

Oil Pump with Vacuum Pump - Tightening
Specification and Sequence

Tighten the bolts in three steps in the sequence shown.
Replace any bolts that were tightened with an additional turn.
Step

Bolts

Tightening specification/additional turn

1