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

13-4


Cylinder block, crankshaft and
flywheel, servicing Notes:

Always replace seals and O-rings.
The engine speed sensor is installed in the
transmission bellhousing with a spacer washer
underneath.
1 -
Main bearing cap bolts
Always replace60 Nm (44 ft lb) + additional 180 (1/2 turn)
2 -
Main bearing caps
Always replace boltsMarking -1- on oil pump sideChecking bearing clearance page 13
-25
3 -
Connecting rod bearing bolts
Always replace30 Nm (22 ft lb) + additional 90 (1/4 turn)When measuring radial clearance, tighten
to 20 Nm (15 ft lb), but do not turn further
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ylinder block, crankshaft and fl
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13-5


4 -
Connecting rod bearings
Do not interchange used bearing shellsConnecting rods, connecting rod bearings
page13
-33

5 -
Piston rings
Checking page 13
-29
6 -
Pistons
Checking page 13
-29
7 -
Crankshaft
Checking page 13
-25
Chain gear for oil pump, removing and
installing page 17
-29

For vehicles with automatic transmission,
always install bushing as pilot for converter Remove bushing using KUKKO 21/2 and
22/1
8 -
Oil passage with seal Always replace seal
9 -
Sealing flange, front
10 -
Bolt 10 Nm (7 ft lb)
11 -
Collar bolt
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ylinder block, crankshaft and fl
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30 Nm (22 ft lb)
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ylinder block, crankshaft and fl
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13-6


12 -
Thrust washer
Measuring crankshaft axial clearance
page 13
-25

Only on 4th crankshaft bearing
13 -
Special bolt (12-sided) Always replaceDriveplate: 60 Nm (44 ft lb) + additional
90 (1/4 turn) Dual-mass flywheel: 60 Nm (44 ft lb) +
additional 180 (1/2 turn)
14 -
Dual-mass flywheel or driveplate
Removing and installing page 13
-22
Needle bearing, removing and installing
page 13
-21

15 -
Crankshaft bearing
Axial and radial clearance, checking
page 13
-25

16 -
Bolt
10 Nm (7 ft lb)
17 -
Oil jet To cool pistons
18 -
Seal for rear flange
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ylinder block, crankshaft and fl
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Replacing page 13
-18
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ylinder block, crankshaft and fl
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13-7


19 -
Bolt
10 Nm (7 ft lb)
20 -
Bolt 25 Nm (18 ft lb)Install hand-tight before fully tightening
21 -
Cylinder block
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ylinder block, crankshaft and fl
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13-8

Ribbed belt, removing and installing


Lock carrier in service position page 13
-1

CAUTION!

Before removing ribbed belt, note direction of
rotation with chalk or felt-tip marker.
Reversing the direction of rotation of a used
belt can destroy the belt. When installing the
ribbed belt, make sure it is seated correctly
on the pulley.

Removing

- Remove engine cover (arrows).

- Remove noise insulation panel (arrows).
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ylinder block, crankshaft and fl
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13-9


Note:
Observe previously marked direction of rotation of belt and that it is
seated correctly on the pulley. - Counterhold pulley for viscous fan using 3212 spanner wrench and
remove viscous fan using 3312 open-end spanner (left thread).
- Carefully lift out viscous fan.

- To loosen ribbed belt, turn tensioner clockwise using 17 mm box
wrench until two holes are aligned (arrows). Counterhold in position
using 3204 drift.
- Remove ribbed belt.
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ylinder block, crankshaft and fl
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13-10

Installing

Note:
Observe previously marked direction of rotation of belt and that it is
seated correctly on the pulley.
Routing of ribbed belt: - First install ribbed belt onto crankshaft pulley and idler wheel. Push belt
onto tensioning roller last.
D1 - without air conditioning
D2 - with air conditioning
- Remove 3204 drift.
- Install engine cover.Tightening torque for viscous fan
Tightening
torque
1331 torque wrench and 3312 open-end spanner 37 Nm (27 ft lb)
1331 torque wrench without 3312 open-end
spanner 70 Nm (52 ft lb)
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ylinder block, crankshaft and fl
ywheel, servicin
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13-11

Vibration damper, removing and
installing


Lock carrier in service position page 13
-1
Ribbed belt, removing and installing page 13
-
8 .

Note:
To remove the vibration damper, it is not
necessary to remove the center bolt.

- Remove vibration damper.

- When installing, make sure notches (arrows) in vibration damper are
aligned with locating lugs on toothed belt sprocket.
Tightening torque (vibration damper to crankshaft): 20 Nm (15 ft lb)
Pa
ge 10 of 33 C
ylinder block, crankshaft and fl
ywheel, servicin
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11/21/2002 htt
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