1997 AUDI A4 engine

13-24


Note:
Before installing the engine, make sure the engine to transmission
centering sleeves are installed in the engine flange. - Measure distance -a- at three places and calculate average.
Distance -a-: approx. 12.3 mm.
- If necessary, install different shim.
Pa
ge 23 of 33 C
ylinder block, crankshaft and fl
ywheel, servicin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE03.13.2

13-28
Crankshaft dimensions

Engine codes AHA, ATQ
Reconditioning dimension
Crankshaft journal diameter mm (in.)
Connecting rod journal diameter mm (in.)
maximum size (from nominal) -0.022 (0.00087) -0.022 (0.00087)
Standard (nominal dimension) 65.00 (2.559) 54.00 (2.126)
minimum size (from nominal) -0.042 (0.00165) -0.042 (0.00165)
maximum size (from nominal) -0.022 (0.00087) -0.022 (0.00087)
1st undersize (nominal dimension) 64.75 (2.549) 53.75 (2.116)
minimum size (from nominal) -0.042 (0.00165) -0.042 (0.00165)
maximum size (from nominal) -0.022 (0.00087) -0.022 (0.00087)
2nd undersize (nominal dimension) 64.50 (2.539) 53.50 (2.106)
minimum size (from nominal) -0.042 (0.00165) -0.042 (0.00165)
maximum size (from nominal) -0.022 (0.00087) -0.022 (0.00087)
3rd undersize (nominal dimension) 64.25 (2.530) 53.25 (2.096)
minimum size (from nominal) -0.042 (0.00165) -0.042 (0.00165)
Pa
ge 27 of 33 C
ylinder block, crankshaft and fl
ywheel, servicin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE03.13.2

13-31


Checking piston ring end gap
Engine codes AHA, ATQ - Insert ring at right angle from top and slide down into lower cylinder
opening until approx. 15 mm from lower edge of cylinder. Piston ring
End gap, new mm. (in.)
Wear limit mm.
(in.)
1
(compression) 0.35-0.50 mm (0.014-0.020
in.) 1.0 mm (0.039 in.)
2
(compression) 0.50-0.70 mm (0.020-0.028
in.) 1.4 mm (0.043 in.)
3 (oil scraper) 0.25-0.50 mm (0.010-0.020
in.) 0.8 mm (0.031 in.)
Pa
ge 30 of 33 C
ylinder block, crankshaft and fl
ywheel, servicin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE03.13.2

13-32

Cylinder bore, checking


Piston and cylinder bore dimensions
Engine codes AHA, ATQ
Note:
Replacement pistons are only available in the basic dimension.
CAUTION!
DO NOT measure cylinder bore dimensions while the cylinder block
is mounted on the engine stand. The cylinder block is stressed and
deformed by its own weight under these conditions and the
measurements will not be accurate. - Measure at three locations diagonally in crosswise direction -A- and
lengthwise direction -B-.
Inner bore gauge: 50-100 mm (1.96-3.94 in.)
Deviation from nominal size: max. 0.08mm (0.0031 in.)Reconditioning
dimension Piston diameter
Cylinder bore
diameter
Basic dimension 82.48 mm (3.2472
in.) 82.51 mm (3.2484
in.)
1st oversize 82.74 mm (3.2575
in.) 82.76 mm (3.2578
in.)
Pa
ge 31 of 33 C
ylinder block, crankshaft and fl
ywheel, servicin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE03.13.2