oil AUDI A4 1995 B5 / 1.G AEB ATW Engines Pistons And Connecting Rods Workshop Manual

13-53


Pistons and connecting rods,
disassembling and assembling
1 -
Nut for connecting rod bolt
30 Nm (22 ft lb) + additional 1/4 turn (90 )Always replace connecting rod bolt -13-Grease thread and contact surfaceTo measure radial play, tighten to 30 Nm
(22 ft lb) but not any further
2 -
Pressure relief valve Tightening torque: 27 Nm (20 ft lb)Opening pressure: 2.5-3.2 bar (36.25-46.4
psi)
3 -
Oil spray nozzle For piston cooling
4 -
Connecting rod bearing cap Mark -B- to indicate which cylinder each
cap belongs to
Installed position:Marks -A- point toward belt pulley side
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7 -
Bearing shell
With oil bore for piston pin lubricationVerify correct installation positionDo not interchange used connecting rod
bearing shells (mark accordingly)
Axial play:New: 0.10-0.35 mm (0.004-0.014 in.)Wear limit: 0.40 mm (0.016 in.)

Measure radial play using Plastigage :New: 0.01-0.05 mm (0.0004-0.0020 in.)Wear limit: 0.12 mm (0.0047 in.)Do not turn crankshaft when measuring
radial play with Plastigage in place To measure radial play, tighten nut -1- to
30 Nm (22 ft lb) but not any further
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g rods, disassemblin
g and assemblin
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8 -
Connecting rod
Replace only as a setMarkings -B- indicate which cylinder each
rod belongs to
Installed position:Marks -A- point toward belt pulley sideWith oil bore for piston pin lubrication
9 -
Circlip
10 -
Piston pin If stiff, warm pistons to approx. 60 C
(140 F) When removing and installing, use
VW222a pilot drift
11 -
Piston rings Offset by 120Use piston ring pliers to remove and installMarking "TOP" must point to piston headChecking piston ring end gap Fig. 1Checking piston ring side clearance Fig.
2

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Fig. 1 Checking piston ring end gap
- Insert ring at right angle from top and slide down until approx. 15 mm
(19/32 in.) from lower edge of cylinder. To insert, use piston without
rings. Piston ring
End gap, new mm (in.)
Wear limit
mm (in.)
1. Compression ring 0.20-0.40
(0.0078-0.0157) 0.8
(0.0315)
2. Compression ring 0.20-0.40
(0.0078-0.0157) 0.8
(0.0315)
3. Oil scraper ring 0.25-0.50
(0.0098-0.0197) 0.8
(0.0315)

Fig. 2 Checking piston ring side clearance
- Before checking, clean ring groove.Piston ring
Side clearance, new mm (in.)
Wear limit
mm (in.)
1. Compression ring 0.06-0.09
(0.0023-0.0035) 0.20
(0.0078)
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2. Compression ring 0.05-0.08
(0.0019-0.0315) 0.20
(0.0078)
3. Oil scraper ring 0.03-0.06
(0.0011-0.0023) 0.15
(0.0059)
Pa
ge 7 of 9 Pistons and connectin
g rods, disassemblin
g and assemblin
g
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE02.13.4