Crankshaft Dimensions

Crankshaft with Crankshaft Bearing Journal Diameter 65 mm
Honing dimension in
mm

Crankshaft bearing
pin diameter

Basic dimension

65.000

Repair stage

64.750

– 0.022
– 0.042
– 0.022
– 0.042

Crankshaft
connecting rod
journal diameter
54.000
– 0.022
– 0.042
53.750
– 0.022
– 0.042

Crankshaft Dimensions

Crankshaft with Crankshaft Bearing Journal Diameter 67 mm
Honing dimension in
mm

Crankshaft bearing
pin diameter

Basic dimension

67.000

Repair stage

66.750

52

– 0.022
– 0.042
– 0.022
– 0.042

Crankshaft
connecting rod
journal diameter
54.000
– 0.022
– 0.042
53.750
– 0.022
– 0.042

Audi A7 Reference Specification Book

•

September 2013

New

Wear limit

0.20 to 0.35
0.20 to 0.40
0.20 to 0.40

0.80
0.80
0.80

Engine –
4.0L CEUC, CRDB

Piston Ring End Gaps
Piston ring dimensions
in mm
1st compression ring
2nd compression ring
Oil scraping ring

Piston Ring Clearance
Piston ring dimensions
in mm
1st compression ring
2nd compression ring
Oil scraping ring

New

Wear limit

0.035 to 0.085
0.005 to 0.045
0.020 to 0.055

0.200
0.150
0.200

Cylinder Dimensions
Honing dimension in mm

Cylinder bore diameter

Nominal dimension
Repair stage
1)

84.510 ± 0.005 2)
84.610 ± 0.005 2)

Measure 50 mm inside the cylinder bore.

Piston Dimensions
Piston diameter in mm
Engine Codes
Nominal dimension
Repair stage
1)

CEUC

CRDB

84.470 1)
84.580 1)

84.490 1)
84.590 1)

Measurement with coating (thickness = 0.018 mm). The coating wears off.

Audi A7 Reference Specification Book

•

September 2013

53

Cylinder Head, Valvetrain – 4.0L CEUC,
CRDB
Fastener Tightening Specifications
Component
Bearing plate for drive chain sprocket bolt
Bracket for idler sprocket to engine 1)
Camshaft adjuster for exhaust camshaft to camshaft 1)
Camshaft adjuster for intake camshaft to camshaft 1)
Camshaft adjustment valve to camshaft housing
Chain tensioner to engine 1)
Chain tensioner with glide track to engine 1)
Connection for coolant to right timing chain cover
Double bolt nut
Engine lifting eye to engine
Exhaust camshaft adjustment valve 2
Glide track to engine 1)
Intake/exhaust camshaft adjuster to camshaft housing
Mounting pin for idler sprocket to engine
Mounting pin for left camshaft timing chain drive sprocket
to bearing plate 1)
Mounting pin for right camshaft timing chain drive
sprocket to engine 1)
1)

Nm
9
5 plus an
additional 90°
(¼ turn)
80 plus an
additional 90°
(¼ turn)
80 plus an
additional 90°
(¼ turn)
5
5 plus an
additional 90°
(¼ turn)
5 plus an
additional 90°
(¼ turn)
9
9
22
5
17 plus an
additional 90°
(¼ turn)
5
42
5 plus an
additional 90°
(¼ turn)
20 plus an
additional 45°
(⅛ turn)

Replace fastener(s).

Compression Checking Specifications
Compression pressure
New
Wear limit
Maximum difference between cylinders
54

Audi A7 Reference Specification Book

Bar pressure
10.0 to 15.0
9.0
3.0
•

September 2013

Dimension
Diameter a
mm
Diameter b
mm
c
mm
α

Engine –
4.0L CEUC, CRDB

Valve Dimensions

Intake valve
33.85 ± 0.10
5.98 ± 0.007
103.97 ± 0.20

Exhaust valve
28.0 ± 0.1
5.935 ± 0.007
101.87 ± 0.2

45

45

∠°

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

Audi A7 Reference Specification Book

•

September 2013

55

Left Timing Chain Cover Tightening Specifications

Step
1
2
1)

Component
Tighten bolts 1 through 8 in sequence
Tighten bolts 1 through 8 in sequence 1)

Nm
5
an additional
90° (¼ turn)

Replace fastener(s)

NOTE: The mount -arrow- is affixed with the timing chain guard.

56

Audi A7 Reference Specification Book

•

September 2013

Step
1
2
1)

Component
Tighten bolts 1 through 8 in sequence
Tighten bolts 1 through 8 in sequence 1)

Nm
5
an additional
90° (¼ turn)

Replace fastener(s)

NOTE: Brackets A and B are connected with the timing chain cover.

Audi A7 Reference Specification Book

•

September 2013

57

Engine –
4.0L CEUC, CRDB

Right Timing Chain Cover Tightening Specifications

Lower Timing Chain Cover Tightening Specifications

Step

Nm

Tighten the bolts (Æ)

5

2

Tighten bolts 2 through 8 in a diagonal
sequence
Tighten the bolts (Æ)

8

3
4

58

Component

1

8

5

Tighten bolts 2 through 8 in a diagonal an additional 90° (¼ turn)
sequence
an additional 90° (¼ turn)
Tighten the bolts (Æ)

6

Tighten bolts 1

Tighten for the power
steering pump, refer to
ElsaWeb, Suspension
Wheels, Steering

Audi A7 Reference Specification Book

•

September 2013

Engine –
4.0L CEUC, CRDB

Cylinder Head Tightening Specifications

NOTE: Replace any bolts that were tightened with an additional turn.
The cylinder head for cylinder bank 2 (left) is shown in the illustration.
Step

Component

Nm

1

Tighten bolts 1 through 10 in sequence

Hand-tighten

2

Tighten bolts 1 through 10 in sequence

30

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

Arrows

an additional 90°
(¼ turn)
an additional 90°
(¼ turn)
10

7

Arrows

Audi A7 Reference Specification Book

an additional 90°
(¼ turn)

•

September 2013

59

Camshaft Guide Frame Tightening Specifications

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

60

Audi A7 Reference Specification Book

•

September 2013

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

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 lines (for Audi RS6/RS7) bolt
Oil pipe-to-oil pump 1)
Oil - pipe - hose line bolt/nut
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
1)
2)
3)
4

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

Replace fastener(s).
For bolt tightening clarification, ElsaWeb, Oil Pan/Oil Pump Overview, item 20.
For bolt tightening clarification, ElsaWeb, Oil Filter Overview, items1
For bolt tightening clarification, ElsaWeb, Spray Nozzle Valve and Hydraulic
Adjuster Check Valve Overview item 12.

Audi A7 Reference Specification Book

•

September 2013

61

Engine –
4.0L CEUC, CRDB

Lubrication – 4.0L CEUC, CRDB

Upper Oil Pan Tightening Specifications

Step
1
2
3

62

Component

Nm

Tighten bolts 1 through 6 in a diagonal
sequence
Tighten bolts 1 through 6 in a diagonal
sequence
Tighten bolts 1 through 6 in a diagonal
sequence

Audi A7 Reference Specification Book

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

•

September 2013

Step
1
2
3

Component
Bolts arrows in a diagonal sequence