Automatic Trans. –
0BK

Hydraulic Pulse Memory Tightening Specifications

Rear Final Drive, Differential – 0BK
Fastener Tightening Specifications
Component
Automatic Transmission Fluid (ATF) drain plug (in the
transmission)
Automatic Transmission Fluid (ATF) oil drain plug (in the
transmission)
Gear carrier 1)
Transmission fluid drain plug (inside the front final drive)
Transmission fluid drain plug (inside the transfer case)
Transmission fluid oil drain plug (inside the front final
drive)
Transmission fluid oil drain plug (inside the transfer case)
1)

Nm
30
12
9 plus an
additional 60°
(1⁄6 turn)
27
27
10
12

Replace fastener(s).

Front Final Drive Cover Tightening Specifications

Step
1
2

Component
Tighten bolts 1 and 6
Tighten bolts 1 through 11 in sequence

Nm
3
27

154 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

Step
1
2
3
1)

Component
Tighten bolts 1 and 6 1)
Tighten bolts 1 through 6 in sequence 1)
Tighten bolts 1 through 6 in sequence

Nm
3
10
an additional
90° (¼ turn)

Replace fastener(s).

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 155

Automatic Trans. –
0BK

Center Differential Housing Tightening Specifications

Rear Final Drive – 0BC, 0BD,
0BE, 0BF
General, Technical Data – 0BC
Rear Final Drive Identification

0BC final drive and 0AR (1Æ). Code and build date (2Æ).

156 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

Final Drive Identification

Final Drive 0BC (Æ) and 0AR

Rear Final Drive –
0BC, 0BD, 0BE, 0BF

Note: 0AR is always on the rear final drive housing.
The changes to the housing are what differentiate
the 0BC final drive from the 0AR final drive.

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 157

Final Drive Identification (cont’d)

The locations of the threaded holes (Æ) for attaching the
cross member to the rear final drive are also different.
The 0BC final drive has 4 threaded holes (Æ) in its housing,
used for attaching the cross member. In addition to this, there
is an additional threaded hole under the flange/driveshaft
used for attaching the final drive to the subframe.

158 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

Rear Final Drive Code and Date of Manufacture

Example:

JKS
Code letters

15
Day

03
Month

07
Year of manufacture 2007

Rear Final Drive –
0BC, 0BD, 0BE, 0BF

When installing a new rear final drive unit, the final drive code, the
PR number and the vehicle engine code must be verified in the
Parts Catalog. This is the only to assure the correct allocation.

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 159

General, Technical Data – 0BD
Rear Final Drive Identification

Final drive 0BD, code letters and manufacture date (Æ).

160 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

AÆ front final drive 0BD with replacement part
number (example: 0BD 500 043A)
BÆ code letters JTN
CÆ Rear final drive manufacture date

Example
292
Production date
292nd calendar day
(always given in
three-digit format)

3242
Day of
manufacture
serial number

Rear Final Drive –
0BC, 0BD, 0BE, 0BF

F
Production year 2006
F = 2006,
G = 2007,
H = 2008, etc.

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 161

General, Technical Data – 0BE, 0BF
Rear Final Drive Identification

Clutch class -arrow 1-. Engine code and build date-arrow
2-. The way to recognize the rear final drive “0BF and 0BE”
is the hydraulic control unit with the side chambers.

162 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

1 Æ Code LFW
2 Æ Rear final drive build dates
3 Æ Classification (classification of the clutch wear
values) for the right clutch. Example: -272D4Æ

Classification (classification of the clutch wear
values) for the left clutch. Example: -4A10-

Example
08
Production year 2008

12
Month

09
Day

Rear Final Drive
Code letters
Ratio
Final drive
Z2:Z1
Driveshaft flange
diameter
Gear oil capacity

KCC
43:13 = 3.308

0BC
NPR
43:13 = 3.308

PFR
43:13 = 3.308

75.5 mm

75.5 mm

75.5 mm

See the Fluid Capacity Tables; Rep. Gr.03;

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 163

Rear Final Drive –
0BC, 0BD, 0BE, 0BF

Rear Final Drive Transmission
Allocations, Ratios, Capacities

Rear Final Drive Transmission Allocations,
Ratios, Capacities (cont'd)
Rear Final Drive
Code letters
Ratio

0BF

MKV
Final drive 43 : 13 = 3.308
Z2:Z1

Driveshaft flange diameter
Gear oil - capacity
• For rear final drive (differential and
pinion)
• No replacement interval
Gear oil specification
ATF capacity
• For the hydraulic control unit and
chambers
• No replacement interval
ATF specification

75.5 mm
See the Fluid Capacity Tables;
Rep. Gr.03;
Refer to the Parts Catalog.

Refer to the Parts Catalog.

The following information can be found in the Electronic Parts Catalog (ETKA):
• Date of manufacture
• Gear oil specification
• Engine, manual transmission and automatic transmission allocation using code
letters and PR numbers.

Fastener Tightening Specifications
Component
Driveshaft heat shield
Intermediate bearing bracket
Lock plate to driveshaft 1)
Final Drive 0BC, 0BD
Balance weight to rear final drive bolt 3)
Balance weight to rear final drive bolt 4)
Crossmember to rear final drive bolt
Heat shield to crossmember bolt
Subframe 2)
- Bolt
- Bolt
Gear Oil Drain and Inspection Plugs 0BE, 0BF
Drain plug for gear oil 1)
Inspection plug for gear oil 1)
Final Drive 0BE, 0BF

-Fastener
Size
-

Nm
24
20
30 plus an
additional 90°
(¼ turn)

-

22
55
55
20

-

55
95

-

15
15

164 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

All Wheel Drive Clutch Valve 2 -N446- to
hydraulic control unit housing bolt
All Wheel Drive Pump -V415- to hydraulic
control unit housing bolt
ATF check plug 1)
ATF drain plug 1)
Bracket for wiring harness to rear final drive
bolt
Gear oil drain plug 1)
Gear oil inspection plug 1)
Gear oil checking plug 0BC
Gear oil checking plug 0BD
Hydraulic control unit 6)
- Bolt 5)
- Bolt

Left line to Hydraulic Control Unit Housing
nut
Oil Pressure/Temperature Sensor
Right Flange Shaft to Final Drive bolt 1)
Right line to Hydraulic Control Unit Housing
nut
Shuttle valve
Gear Oil Drain and Inspection Plugs, 0BE, 0BF
ATF drain plug 1)
ATF inspection plug 1)
1)
2)

3)

4)

5)
6)

-Fastener
Size
-

Nm

-

5

-

15
15
9

2.5

15
15
30
45
M8 x 50
M8 x 30

20
see tightening
sequence
→ Hydraulic
Control
Module, 0BE,
0BF
30
10
50 + 90°
30
8
15
15

Replace
For bolt tightening clarification, refer to ElsaWeb, Final Drive 0BC, 0BD Overview
items 2 and 3
For bolt tightening clarification, refer to ElsaWeb, Final Drive 0BC, 0BD Overview
item 1
For bolt tightening clarification, refer to ElsaWeb, Final Drive 0BC, 0BD Overview
item 9
Coat the thread with Sealing Compound -D 176 501 A1For bolt tightening clarification, refer to ElsaWeb, Final Drive 0BE, 0BF Overview
items 7, 8 and 9

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 165

Rear Final Drive –
0BC, 0BD, 0BE, 0BF

Component

Driveshaft to Rear Final Drive
Tightening Specification

Always replace the driveshaft bolts 1.
Step
1
2
3
1)

Bolts
1
1
1

Tightening Specification/Additional Turn
Next to the color dot 30 Nm 1)
30 Nm
Plus an additional 90° (¼ turn)

By doing this, the CV joint is pushed slightly to the opposite side and imbalance is
avoided.

166 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

General, Technical Data
Chassis
Front axle
Rear axle

Five-link front axle, transverse stabilizer, air spring
damper with variable levels and damping characteristics,
guide links with hydraulic damping mounts
Track-controlled axle, upper and lower transverse link,
transverse stabilizer, independent suspension, air spring
damper with variable levels and damping characteristics

FWD/AWD
Wheelbase
Front track
Rear track
Maximum
steering angle at
inner wheel
1)
2)
3)

mm
mm
mm
Degree

Standard
suspension
(1BK) 1)
2992
1644
1635
39.8

Sport
suspension
(2MA/2MB) 2)
2994
1632
1623
39.8

Heavy duty
suspension
(1BY) 3)
2991
1643
1634
39.8

Suspension in the “Comfort” level.
Suspension in the “Sport” level.
Suspension in the “heavy duty suspension” level.

NOTE: The specified values apply to all engine versions.
Tracks change with use of wheels with different offset.

Steering
Steering gear
Turning
diameter

Maintenance-free rack and pinion steering with speeddependent servo assist
Approximately 12.30 meters

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 167

Suspension,
Wheels, Steering

Suspension, Wheels,
Steering

Front Suspension
Fastener Tightening Specifications
Component
Adapter-to-subframe bolt
Air spring shock absorber-to-shock
absorber fork bolt 1)
Air spring shock absorber-to-suspension
strut dome nut 1) 5)
Ball joint-to-track control arm nut 1)
Ball joint-to-wheel bearing housing bolt 1)
Air line connecting piece with the residual
pressure retaining valve
Constant Velocity (CV) joint boot clamp
Control arm-to-wheel bearing housing nut 1)
Coupling rod-to-shock absorber fork bolt 1) 3)
Coupling rod-to-stabilizer bar bolt 1) 3)
Drive axle-to-transmission bolt 1)

Fastener
size
-

Nm

-

20
40 plus an
additional 180°
(½ turn)
30

-

120
40
3

-

20
120
40 plus an
additional 90°
(¼ turn)
40 plus an
additional 90°
(¼ turn)
70
90 plus an
additional 90°
(¼ turn)
200 plus an
additional 180°
(½ turn)
70 plus an
additional 180°
(½ turn)

M10
M12

Drive axle-to-wheel hub bolt 1)

-

Guide link-to-subframe nut 1) 3)

-

168 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

Guide link-to-wheel bearing housing nut 1)
Heat shield-to-subframe bolt
Level control system sensor bolt
Outer Constant Velocity (CV) joint

Fastener
size
-

Power steering hose-to-subframe bolt
Protection bracket-to-subframe bolt
Shock absorber fork-to-track control arm
nut 1) 3)