1998 AUDI A4 checking

13-80


2 -
Connecting rod bearing cap
Mark cylinder number -B-Installation position: Markings -A- face
towards pulley side
3 -
Bearing shells Upper bearing shell with oil bore for piston
bolt lubrication Installation position Fig. 5
, Page
13
-85

Do not interchange used bearing shells
(mark). Axial clearance New: 0.10 to 0.35 mm,
Wear limit: 0.40 mm Check radial clearance with Plastigage :
New: 0.01 to 0.05 mm, Wear limit: 0.12
mm. Do not rotate crankshaft when
checking radial clearance
Pa
ge 2 of 8 Pistons and connectin
g rods, disassemblin
g and assemblin
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.GE06.13.4

13-82


7 -
Piston
Checking Fig. 3
, Page 13
-84
Mark installation position and cylinder
number. Arrow on piston crown points to pulley endInstall using piston ring clamp.Piston and cylinder dimensions Page 13
-86

8 -
Piston rings
Offset gaps by 120Remove and install with piston ring pliers."TOP" must face piston crownCheck ring gap Fig. 1
, Page 13
-83
Check ring to groove clearance Fig. 2
,
Page 13
-83

Pa
ge 4 of 8 Pistons and connectin
g rods, disassemblin
g and assemblin
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.GE06.13.4

13-83


Fig. 1 Checking piston ring gap
- Push ring squarely from above down to approx. 15 mm from bottom
end of cylinder. To do this, use a piston without rings. Piston ring
Dimensions in mm
New
Wear limit
1. compression ring 0.20 to 0.40 0.8
2. compression ring 0.20 to 0.40 0.8
Oil scraper ring 0.25 to 0.50 0.8

Fig. 2 Checking ring to groove clearance
- Clean groove before checking clearance.Piston ring
Dimensions in mm
New
Wear limit
1. compression ring 0.06 to 0.09 0.20
2. compression ring 0.05 to 0.08 0.20
Oil scraper ring 0.03 to 0.06 0.15
Pa
ge 5 of 8 Pistons and connectin
g rods, disassemblin
g and assemblin
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.GE06.13.4

13-84


Fig. 3 Checking piston
-
Measure pistons approx. 10 mm from lower edge of skirt, at 90 to
piston pin axis.
Permissible deviation from nominal dimension: no more than 0.04 mm

Special tools and equipment Fig. 4 Checking cylinder bores
Use internal dial gauge 50 to 100 mm
- Take measurements at 3 positions in both lateral direction -A- and
longitudinal direction -B-. Permissible deviation from nominal dimension: no more than 0.08 mm
Pa
ge 6 of 8 Pistons and connectin
g rods, disassemblin
g and assemblin
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.GE06.13.4