engine AUDI A4 1997 B5 / 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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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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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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13-12

Toothed belt, removing and installing


Removing

- Remove engine cover.

Ribbed belt, removing and installing page 13
-8 . - Remove noise insulation panel (arrows).
Lock carrier in service position page 13
-1
- Unclip toothed belt guard on both sides and remove.
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13-13


- Turn crankshaft at central bolt of toothed belt gear in direction of
engine rotation to cyl. 1 TDC. Timing marks -A- and -B- must be
aligned.

WARNING!
DO NOT turn crankshaft while checking for TDC mark. Personal
injury may result. - Check position of camshafts. Large holes (arrow) of securing plates on
camshaft sprockets must face toward inside and align.
If not, turn crankshaft one revolution further.
- Remove sealing plug from left-side of cylinder block.
- Top Dead Center (TDC) mark on crankshaft must be visible or be felt
behind bore of removed sealing plug.
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13-17


1) Always replace the center bolt. 2) Two turns of 90 are permissible. - Using 8 mm hex wrench, turn toothed belt tensioner roller -1- counter-
clockwise, opposite direction shown (arrow) until tensioning lever -2-
compresses tensioner -3- so that spring clamp can be removed and
then remove clamp.
- Before starting engine, pre-load timing tensioning roller as follows:
- Using a torque wrench with 8 mm hex bit, apply tension to toothed
belt clockwise in direction shown (arrow) until a torque of 15 Nm is
attained. This ensures tensioner has expanded completely and is
properly engaging toothed belt. Component
Tightening torque
Toothed belt sprocket to camshaft 55 (41 ft lb)
Idler wheel 45 (33 ft lb)
Toothed belt tensioning roller 20 (15 ft lb)
Belt pulley to crankshaft 20 (15 ft lb)
Toothed belt tensioner 10 (7 ft lb)
Center bolt 1) to crankshaft
200 (148 ft lb) + 180 2)
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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)
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13-23

Driveplate

- Hold crankshaft in position using 3242
crankshaft holder page 13
-12
.

- Mark hole pattern of driveplate, shim -1- and
washer -2- to crankshaft.

- Mark positions of shim -1- and washer -2-
(behind driveplate).

CAUTION!
Part numbers are listed here for reference only. Always check with
your Parts department for the latest information.
Notes: - Install driveplate with washer -2- (Part No. 035 105 303 A) and shim -1-
3.0 mm (Part No. 054 105 301) or 4.0 mm (Part No. 054 105 202).
Short engines and exchange engines are supplied without a bushing
in the crankshaft. Always install a new bushing before installing the
driveplate. Remove bushing using 21/1 Kukko puller and 21/2 Kukko support.Always replace driveplate mounting bolts.
Component
Tightening torque
Driveplate to crankshaft
30 Nm (22 ft lb) + 90
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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.
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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)
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