dimensions AUDI A8 1998 D2 / 1.G AHA ATQ Engines Cylinder Block Crankshaft And Flywheel Component Service Manual

13-22

Dual-mass flywheel or driveplate,
removing and installing, installation
dimensions


Dual-mass flywheel

Note:
A pilot needle bearing is in the dual-mass flywheel and must be inserted
when dual-mass flywheel is replaced.
Note:
Always replace dual-mass flywheel mounting bolts. - With crankshaft at Top Dead Center (TDC), install 3242 crankshaft
holder.
- Mark position of dual-mass flywheel and engine housing (arrows).
- Remove bolts and replace.Component
Tightening torque
Dual-mass flywheel to crankshaft
60 Nm (44 ft lb) + 180 Clutch to dual-mass flywheel 20 Nm (15 ft lb)
Pa
ge 21 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

13-30

Piston and cylinder bore dimensions

Reconditioning
dimension Piston diameter
Basic dimension 82.48 mm (3.247
in.)
1st oversize 82.74 mm (3.257
in.)

Checking piston ring side clearance
Clearance when new
Wear limit
0.02-0.08 mm (0.0008-0.0031 in.) 0.10 mm (0.004 in.)
Pa
ge 29 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