1996 AUDI A4 oil

13-79


Pistons and connecting rods,
disassembling and assembling Note:
Oil spray jet and pressure relief valve Fig. 6
,
Page 13
-85

1 -
Conrod bolt - 30 Nm +
1/4 turn (90 )
further
Always replaceOil threads and contact surfaceTo measure radial clearance use old boltTo measure radial clearance tighten to 30
Nm but not further
Pa
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g rods, disassemblin
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g
11/21/2002 htt
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pair&id=AUDI.B5.GE06.13.4

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
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pair&id=AUDI.B5.GE06.13.4

13-81


4 -
Connecting rod
Only replace as a setMark cylinder number -B-Installation position: Markings -A- face
toward pulley side With oil bore for piston pin lubrication
5 -
Circlip
6 -
Piston pin If difficult to remove, heat piston to approx.
60 C Remove and install with VW 222a
Pa
ge 3 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

13-85


Fig. 5 Location of bearing shell
- Install bearing shells centrally into connecting rod or into connecting
rod bearing cap.

Distance a = 3.0 mm

Fig. 6 Oil spray jet and pressure relief valve
1 - Oil spray jet (for piston cooling)
2 - Bolt with pressure relief valve - 27 Nm

Opening pressure 1.3 to 1.6 bar
Pa
ge 7 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