Pistons and Connecting Rods, Disassembling and Assembling Audi A4 B6

Note. Oil injector jet for piston cooling, see OIL INJECTOR JET FOR PISTON COOLING

Note. The following list refers to items in see scheme 193.

Scheme 184

1. Connecting rod bolt - 30 Nm plus an additional 90° (1/4 turn) Always replace Grease thread and contact surface Tighten to 30 Nm when measuring radial clearance, but do not turn further
2. Connecting rod bearing cap Do not interchange Mark allocation to cylinder using a color marker -B-. See «PISTON INSTALLED POSITION AND APPLICATION PISTON/CYLINDER»(ref-197058-S09226960732006032100000) .. Observe when installing bearing cap: Tabs at contact surfaces at face of connecting rod must be aligned -A-. Installed position of connecting rod pairs. See «INSTALLED POSITION OF CONNECTING RODS»(ref-197058-S38381976032006032100000) ..
3. Bearing shell Note installed position Do not interchange run-in connecting rod bearing shells (mark) Measuring radial play. See «CONNECTING ROD RADIAL PLAY, CHECKING»(ref-197058-S39956944972005101100000) . Tighten bolts -item 1 - to 30 Nm when measuring radial clearance, but do not turn further
4. Connecting rod Replace only as a set Mark allocation to cylinder using a color marker -B-. See «PISTON INSTALLED POSITION AND APPLICATION PISTON/CYLINDER»(ref-197058-S09226960732006032100000) . Observe when installing bearing cap: Tabs at contact surfaces at face of connecting rod must be aligned -A- Installed position of connecting rod pairs. See «INSTALLED POSITION OF CONNECTING RODS»(ref-197058-S38381976032006032100000) .
5. Snap ring
6. Piston pins In case of difficulty of movement, warm piston to approx. 60° C. When removing and installing, use VW222a Pilot drift
7. Pistons Installed position and allocation piston/cylinder. See «Piston installed position and application piston/cylinder»(ref-197058-S09226960732006032100000) .. Arrow on piston head points to belt pulley side Checking, see «CHECKING PISTONS»(ref-197058-S27893926762006032100000) Install with piston ring tension strip Piston and cylinder dimensions, see «PISTON AND CYLINDER MEASUREMENTS»(ref-197058-S28215778752005101100000) Checking cylinder bore hole, see «CHECKING CYLINDER BORE»(ref-197058-S17403213632006032100000)
8. Piston rings Shift by 120° Use piston ring pliers to remove and install Marking or identification "TOP" i.e. marked side must face toward the piston head End gap play, checking see «CHECKING PISTON RING END GAP»(ref-197058-S31780569882006032100000) . Height play (piston ring side clearance), checking see «CHECKING PISTON RING SIDE CLEARANCE»(ref-197058-S24327111892006032100000)

Scheme 185

1. Insert ring at a right angle to cylinder wall from above to lower cylinder opening approx. 15 mm cylinder edge. When inserting, use pistons without rings PISTON RING END GAP SPECIFICATIONS Piston ring (Distance in mm) New Wear limit 1. Compression ring 0.35 to 0.50 0.8 2. Compression ring 0.60 to 0.80 1.0 Oil scraper ring 0.25 to 0.50 0.8