oil AUDI A8 1998 D2 / 1.G AHA ATQ Engines Cylinder Block Crankshaft And Flywheel Component Service Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 1998, Model line: A8, Model: AUDI A8 1998 D2 / 1.GPages: 33, PDF Size: 0.75 MB
Page 1 of 33

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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Page 2 of 33

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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Page 4 of 33

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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Page 13 of 33

13-14
 
    
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. 
Notes:  -  Install 3242 crankshaft holder into sealing plug opening.
-  Remove tensioner for ribbed belt.
-  Remove center and right toothed belt guards.
The toothed belt tensioner is oil dampened. Compress it by slowly 
applying constant pressure. Use spring clamp from 2024A.
    
-  Using 8 mm hex wrench, turn toothed belt tensioning roller -1- counter-
clockwise, opposite direction shown (arrow), until tensioning lever -2- 
compresses tensioner -3- so that spring clamp (2 mm dia.) can be 
inserted into bore and lifter. 
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Page 18 of 33

13-19
      
-  Remove crankshaft/toothed belt gear.
     
-  Unscrew inner part of 3203 seal puller two turns 
(approx. 3 mm) and secure using knurled bolt. 
    
Installing   -  Grease threaded head of 2085 seal puller, position and with forced 
pressure screw into oil seal as far as possible. 
-  Loosen knurled bolt and turn inner part against crankshaft until oil seal 
is removed. 
-  Place 3202/1 guide sleeve on crankshaft pin.
-  Slide dry oil seal over guide sleeve.
    
The rest of the installation follows is the reverse of removal.  -  Press in oil seal to stop using 3265 seal installer.
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Page 19 of 33

13-20
      
Dual-mass flywheel  
     
Notes:  
     
Only replace oil seal with sealing flange.
     Drain coolant before removing sealing flange   
page 19
-11
 . 
      If sealing flange is not available, proceed as 
follows:  
     
-  Remove clutch and dual-mass flywheel or 
driveplate. 
    
Notes:  -  Pry out seal using 10-221 extractor.
-  Clean running and sealing surfaces.
-  Push seal onto crankshaft using assembly aid.
Do not lubricate sealing lip or outer edge of seal before pressing in.The assembly aid is supplied with the seal.
    
-  Press in seal up to stop using 2003/3 seal installer and bolts for dual-
mass flywheel or driveplate. 
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Page 24 of 33

13-25
      
Crankshaft axial and radial clearance, 
measuring
 
     
Axial clearance  
     
CAUTION! 
     
Bearing shells must be reinstalled in their 
original location and orientation. Always label 
the bearing shells according to their installed 
position before removing. Never interchange 
used bearing shells. 
    
-  Attach dial indicator together with VW387 dial indicator holder to oil 
pump and set indicator against crankshaft counterweight. 
-  Press crankshaft against dial indicator by hand and set indicator to 
zero. 
-  Press crankshaft away from dial indicator.
- Read gauge.
Clearance when new  
Wear limit  
0.07-0.23 mm (0.0028-0.0091 in.)   0.25 mm (0.0098 in.)  
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Page 26 of 33

13-27
      
Crankshaft bearing cap, installing
 
    
Bearing -1- is installed on the oil pump side of the cylinder block, and 
bearing -4- on the dual-mass flywheel side of the cylinder block.  
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Page 30 of 33

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.)  
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