S4 Quattro Cabriolet V8-4.2L (BHF) (2008)
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‹› Radial clearance, measuring, refer to => [ Connecting Rod, Measuring Radial Clearance ] See: Testing and Inspection/Connecting Rod,
Measuring Radial Clearance
‹› When measuring radial clearance, tighten bolts => [ (Item 1) Connecting rod bolt - 30 Nm plus an additional 90° (/ turn) ] to 30 Nm but do not
turn further
‹› Over-sized bearings are available for reworked crankshaft connecting rod journals.
4
Connecting rod
‹› Only replace as set
‹› Mark allocation to cylinder with paint - B - => [ Mark connecting rod ]
‹› When installing bearing cap, observe: The wide thrust flange - A - must point to the same side on connecting rod and connecting rod bearing
cap
‹› Installation position of connecting rod pairs => [ Connecting rod, installed location ]
‹› Axial play for each new connecting rod pair: 0.20 to 0.38 mm
‹› Axial play wear limit: 0.60 mm
‹› Radial clearance, measuring, refer to => [ Connecting Rod, Measuring Radial Clearance ] See: Testing and Inspection/Connecting Rod,
Measuring Radial Clearance
5
Piston pin
‹› If tight, heat piston to 60 °C
‹› Removing and installing using a drift (VW 222 A )
6
Circlip
7
Piston
‹› Installation position of pistons => [ Piston installation position ]
‹› Piston and cylinder dimensions, refer to => [ Piston and Cylinder Dimensions ] See: Piston/Specifications
‹› Checking => [ Pistons, Checking ] See: Piston/Testing and Inspection
‹› Install with piston ring compressor
‹› Measuring cylinder bore => [ Cylinder Bore, Measuring ] See: Testing and Inspection
8
Piston rings
‹› Offset gaps by 120°
‹› Use piston ring pliers for removal and installation
‹› "TOP" marking or inscribed side must point to piston head
‹› Measuring end cap => [ Piston Ring Gap, Measuring ] See: Piston Ring/Testing and Inspection/Piston Ring Gap, Measuring
‹› Measuring side clearance => [ Piston Ring Side Clearance, Measuring ] See: Piston Ring/Testing and Inspection/Piston Ring Side Clearance,
Measuring
Piston installation position
