1997 AUDI A8 01V Transmission Drive Pinion And Ring Gear Adjust Workshop Manual

39-193

- Turn ring gear back until it contacts opposite
tooth flank (backlash).

- Read backlash and note.

-
Turn ring gear an additional 90 in each case
and repeat measurement 3 times.
Note:
If measurements vary more than 0.06 mm from
each other, ring gear or gear set is not installed
correctly. Check installation, replace gear set if
necessary.

Determining average backlash

Example:

1. Measurement 0.28 mm
+ 2. Measurement 0.30 mm
+ 3. Measurement 0.30 mm
+ 4. Measurement 0.28 mm
= Total of measurements 1.16 mm

Result: The average backlash is 1.16 mm / 4
= 0.29 mm
Pa
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pinion and rin
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justin
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11/20/2002 htt
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e=re
pair&id=AUDI.B5.AT01.39.15

39-194

Determining thickness of shim "S2"

Formula:
"S2"
=
"S2*" - backlash + lift

Example:

Installed shim "S2*" 1.00 mm
- Average backlash 0.29 mm
+ Lift (constant) 0.15 mm
= Thickness of shim "S2" 0.86 mm

- Determine shim as closely as possible according
to table. Part numbers

Parts-catalog
Available shims for S2

Adjustment shim thickness (mm)
1)
0.15 0.50 1.50
0.20 0.80
0.25 1.00

1) By using shim tolerances, it is possible to
Pa
ge 34 of 38 Drive
pinion and rin
g gear, ad
justin
g
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.AT01.39.15

determine the exact shim thickness required,
insert two shims if necessary
Pa
ge 35 of 38 Drive
pinion and rin
g gear, ad
justin
g
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.AT01.39.15

39-195

Determining thickness of shim "S1"

Formula:
"S1"
=
"Stotal" - "S2"

Example:

Total shim thickness "Stotal" for "S1"
+ "S2" 1.80
mm
- Thickness of shim "S2" 0.86
mm
= Thickness of shim "S1" 0.94
mm

- Determine shim as closely as possible according
to table. Part numbers

Parts-catalog
Available shims for S1

Thickness of adjustment shims in mm
1)
0.15 0.50 0.90
0.20 0.60 1.00
0.30 0.70 1.20
Pa
ge 36 of 38 Drive
pinion and rin
g gear, ad
justin
g
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.AT01.39.15

0.40 0.80

1) By using shim tolerances, it is possible to
determine the exact shim thickness required,
insert two shims if necessary
Pa
ge 37 of 38 Drive
pinion and rin
g gear, ad
justin
g
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
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yp
e=re
pair&id=AUDI.B5.AT01.39.15

39-196


Checking measurement
Notes:
Drive pinion installed with shim S3 Differential installed with shims "S1" and "S2"
- Turn differential 5 rotations in each direction to seat the tapered roller
bearing.
- Measure backlash 4 times on circumference.

Specification: 0.12 to 0.22 mm
If backlash is outside tolerance, repeat adjustments. Do not change
total shim thickness "Stotal" while doing so. The individual measurement values can deviate a maximum of 0.06
mm from each other
Pa
ge 38 of 38 Drive
pinion and rin
g gear, ad
justin
g
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.AT01.39.15