17

Allocation of Crankshaft Bearing Shells
for Guide Frame – Version 2

Bearing shells with the correct thickness are allocated to the
guide frame in the factory. Colored dots on the sides of the
bearing shells identify the bearing shell thickness. Allocation
of the bearing shells to guide frame is identified by a letter on
the front crankshaft counterweight, as shown in the illustration.
The X marks the end of the letter sequence and is near the
bearing (1) color identification on the belt pulley side.
Colored dot on crankshaft
R
G
B

18

Color of bearing
Red
Yellow
Blue

Audi R8/Spyder Quick Reference Specification Book • September 2013

Allocation of Main Bearing Shells,
Used and Refaced Crankshafts

Bearing shells are allocated to cylinder block corresponding
to color markings stamped into cylinder block. With used and
refaced crankshafts, measure the main crankshaft journals
to allocate the appropriate bearing shells. Thicker oversized
bearing shells are available for refaced crankshafts. These have
the same color markings as the original size bearing shells.
Color of bearing
Red
Yellow
Blue

Audi R8/Spyder Quick Reference Specification Book • September 2013

Engine –
4.2L CNDA

Colored dot on crankshaft
R
G
B

19

Allocation of Crankshaft Bearing
Shells for Guide Frame

• With used and refaced crankshafts, measure the main crankshaft
journals to allocate the appropriate bearing shells.
• Any other markings on the crankshaft are invalid when refacing
crankshafts.
• Use the following table to allocate the bearing shells to the
diameter of the main crankshaft journals.
Crankshaft bearing
pin diameter in mm
Basic dimension
65.000
Repair stage
64.750 1)
1)

Color identification of bearing shells for
guide frame in mm
Red
Yellow
Blue
64.976 to
64.972 to
64.965 to
64.972
64.965
64.960
64.726 to
64.722 to
64.715 to
64.722
64.715
64.710

The same color marking applies to the thicker oversized bearing for refaced
crankshafts as for new crankshafts despite the greater bearing thickness.

20

Audi R8/Spyder Quick Reference Specification Book • September 2013

Connecting Rod, Allocating with Connecting
Rod Bearing Shells to Crankshaft

The crankshaft is allocated to a connecting rod of the proper
width at the factory. Stamped letters on the narrow side of
the base identify the width of the base. The allocation of the
connecting rod to the crankshaft is identified by a letter on the
front crankshaft counterweight as shown in the illustration.

Letter on crankshaft
X
Y

Connecting rod base width in mm
Narrow (18.650 to 18.669)
Wide (18.670 to 18.690)

Audi R8/Spyder Quick Reference Specification Book • September 2013

21

Engine –
4.2L CNDA

NOTE: The numbers under the sequence of letters indicate
the allocation of the connecting rod pins from front to rear.

Allocation of Connecting Rod Bearing
Shell Thickness to Crankshaft

The crankshaft is allocated to connecting rod bearing shells of the
proper thickness at the factory. The colored dots on the sides of the
bearing shells identify the bearing shell thickness. The allocation
of the bearing shells to the crankshaft is identified by a letter on
the front crankshaft counterweight, as shown in the illustration.
NOTE: The numbers under the sequence of letters indicate
the allocation of the crankshaft pins from front to rear.
Letter on crankshaft
R
G
B

22

Bearing color combination
(connecting rod/cover
alternatively)
Red/Yellow
Yellow/Blue
Blue/Blue

Audi R8/Spyder Quick Reference Specification Book • September 2013

Fastener Tightening Specifications
Component
Baffle
Connecting rod 1)
Damper roller
Flywheel 1)
Generator bracket
Damper roller 2)
Oil spray jet
Oil tray-to-guide frame
Ring gear
Ribbed belt tensioning element
1)

M8
M10
-

Nm
9
40 plus an
additional 120°
(⅓ turn)
22
60 plus an
additional 90°
(¼ turn)
22
46
9
40
9
9
12
22

Replace fastener(s).
For bolt tightening clarification, refer to ElsaWeb, Ribbed Belt Drive Overview, items
10 and 12.

Engine –
4.2L CNDA

2)

Fastener
size
-

Audi R8/Spyder Quick Reference Specification Book • September 2013

23

Vibration Damper Tightening Specification

Step
1
2
3
1)

Component
Tighten bolts in a diagonal sequence 1)
Tighten bolts in a diagonal sequence
Tighten bolts in a diagonal sequence

Nm
15
22
an additional
90° (¼ turn)

Replace fastener(s).

24

Audi R8/Spyder Quick Reference Specification Book • September 2013

Guide Frame Tightening Specifications

Step
1
2
3
4
5
6

Tighten guide frame-to-cylinder block sealing
surface bolts (not numbered) in a diagonal
sequence

Nm
30
20
50
30
an additional
90° (¼ turn)
9

Replace fastener(s).

Audi R8/Spyder Quick Reference Specification Book • September 2013

Engine –
4.2L CNDA

1)

Component
Tighten bolts 1 through 10 in sequence 1)
Tighten bolts 11 through 20 in sequence 1)
Tighten bolts 1 through 10 in sequence
Tighten bolts 11 through 20 in sequence
Tighten bolts 1 through 10 in sequence

25

Crankshaft Dimensions
Honing dimension
in mm
Basic dimension

Crankshaft bearing pin
diameter
65.000
-0.024
-0.040
64.750
-0.024
-0.040

Repair stage

Connecting rod pin
diameter
54.000
-0.024
-0.040
53.750
-0.024
-0.040

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

New

Wear limit

0.150 to 0.300
0.005 to 0.045
0.200 to 0.400

0.800
0.800
0.800

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
0.020 to 0.045
0.020 to 0.055

0.200
0.200
0.150

Piston and Cylinder Dimensions
Cylinder bore diameter mm
84.510 ± 0.005
84.610 ± 0.005
1)

Piston diameter mm
84.490 1)
84.590 1)

Measurement with coating (thickness = 0.01 mm). The graphite coating
wears away.

26

Audi R8/Spyder Quick Reference Specification Book • September 2013

Cylinder Head, Valvetrain – 4.2L CNDA
Component
Camshaft adjustment valve 2 (N208)
Camshaft adjustment valve 2 (exhaust) (N319)
Camshaft adjusters 1)
Camshaft Position (CMP) sensor 2 (G163)
Camshaft Position (CMP) sensor 4 (G301)
Timing mechanism drive chain tensioner 1)
Power take-off drive chain tensionser 1)
Cylinder head locking bolt
Power take-off drive sprocket
A/C compressor driveshaft
Engine lifting eye
Gliding piece-to-engine 1)
Timing mechanism drive chain guide rail 1)
Power take-off chain idler sprocket
Idler sprocket mounting bracket 1)
Left camshaft timing chain drive sprocket
Left camshaft timing chain tensioner 1)
Drive sprocket mounting bracket
Right camshaft timing chain drive sprocket
Right camshaft timing chain tensioner 1)

1)

Nm
2.4
2.4
80 plus an
additional 90°
(¼ turn)
9
9
5 plus an
additional 90°
(¼ turn)
5 plus an
additional 90°
(¼ turn)
35
64
60
22
5 plus an
additional 90°
(¼ turn)
17 plus an
additional 90°
(¼ turn)
42
5 plus an
additional 90°
(¼ turn)
22
5 plus an
additional 90°
(¼ turn)
9
42
5 plus an
additional 90°
(¼ turn)

Replace fastener(s).

Audi R8/Spyder Quick Reference Specification Book • September 2013

27

Engine –
4.2L CNDA

Fastener Tightening Specifications

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

Bar pressure
10.0 to 14.0
9.0
3.0

Valve Dimensions

Dimension
Diameter a
mm
Diameter b
mm
c
mm
α
∠°

Intake valve
33.85 ± 0.10
5.965 ± 0.005
103.97 ± 0.20
45

Exhaust valve
28.0 ± 0.1
5.955 ± 0.007
101.87 ± 0.20
45

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

28

Audi R8/Spyder Quick Reference Specification Book • September 2013

Left Timing Chain Cover Tightening Specification

Step
1

Component
Tighten bolts 1 through 8 in sequence

Nm
9

Step
1

Component
Tighten bolts 1 through 8 in sequence

Engine –
4.2L CNDA

Right Timing Chain Cover Tightening Specification

Nm
9

Audi R8/Spyder Quick Reference Specification Book • September 2013

29

Lower Timing Chain Cover Tightening Specifications

Step
1
2
3

Tighten the bolts 1 through 10 in a diagonal
sequence 1)
Tighten bolts (Æ)

4

Tighten bolts 2, 6 and 7 in a diagonal sequence

5

Tighten bolts 1, 3, 4, 5, 8, 9, and 10 in a
diagonal sequence
Tighten bolts (Æ)

6
1)

Component
Tighten the bolts (Æ) 1)

Nm
5
8
10
22
an additional
90° (¼ turn)
an additional
90° (¼ turn)

Replace fastener(s).

30

Audi R8/Spyder Quick Reference Specification Book • September 2013

Spur Gear Unit Tightening Specification

Component
Tighten bolts 1 through 6 in a diagonal
sequence

Nm
22

Engine –
4.2L CNDA

Step
1

Audi R8/Spyder Quick Reference Specification Book • September 2013

31

Cylinder Head Tightening Specifications

NOTE: Both cylinder heads are identical in tightening.
Step

1)

Component

Nm
Hand-tighten

1

Tighten bolts 1 through 10 in sequence

2

Tighten bolts 1 through 10 in sequence

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

Tighten bolts (Æ) 1)

an additional