A4 Sedan L4-1.8L Turbo (AEB) (1997)
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Connecting Rod: Service and Repair
Pistons and connecting rods, disassembling and assembling
1 - Nut for connecting rod bolt
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30 Nm (22 ft. lbs.) + additional 1/4 turn (90°)
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Always replace connecting rod bolt -13-
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Grease thread and contact surface
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To measure radial play, tighten to 30 Nm (22 ft. lbs.) but not any further
2 - Pressure relief valve
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Tightening torque: 27 Nm (20 ft. lbs.)
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Opening pressure: 2.5 - 3.2 bar (36.25 - 46.4 psi)
3 - Oil spray nozzle For piston cooling
4 - Connecting rod bearing cap
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Mark -13- to indicate which cylinder each cap belongs to
Installed position:
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Marks -A- point toward belt pulley side
5 - Bearing shell
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Verify correct installation position
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Do not interchange used connecting rod bearing shells (mark accordingly)
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Check for proper securing in retaining tabs
Axial play:
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New: 0.10 - 0.35 mm (0.004 - 0.014 inch)
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Wear limit: 0.40 mm (0.016 inch)
Measure radial play using Plastigage:
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New: 0.01 - 0.05 mm (0.0004 - 0.0020 inch)
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Wear limit: 0.12 mm (0.0047 inch)