S5 Quattro Coupe V8-4.2L (CAUA) (2009)
‹› Replace bearing shells that have worn down to the nickel layer
‹› Radial clearance, measuring, refer to => [ Connecting Rod, Measuring Radial Clearance ] See: Testing and Inspection
‹› Over-sized bearings are available for reworked crankshaft connecting rod journals.
4
Connecting rod
‹› Only replace as set
‹› Mark affiliation to cylinder with paint => [ Mark connecting rod ]
‹› Installation position of connecting rod pairs => [ Connecting rod installation position ]
‹› Axial play for each new connecting rod pair: 0.20 to 0.27 mm
‹› Axial play wear limit: 0.30 mm
‹› Radial clearance, measuring, refer to => [ Connecting Rod, Measuring Radial Clearance ] See: Testing and Inspection
5
Piston pin
‹› Heat piston to 60 °C if it is difficult to move.
‹› Removing and installing using a Drift (VW 222 A)
6
Circlip
‹› Replace
7
Piston
‹› Installed location => [ Piston installed position ]
‹› Piston and cylinder dimensions, refer to => [ Piston and Cylinder Dimensions ] See: Piston/Specifications
‹› Checking, refer to => [ Pistons, Checking ] See: Piston/Testing and Inspection
‹› Install with piston ring compressor
‹› Measuring cylinder bore, refer to => [ Cylinder Bore, Measuring ] See: Testing and Inspection
8
Piston rings
‹› Offset gaps by 120°
‹› Use piston ring pliers for removal and installation
‹› The "TOP" marking or side with writing faces the piston crown.
‹› Gap, measuring, refer to => [ Piston Ring Gap, Measuring ] See: Piston Ring/Testing and Inspection/Piston Ring Gap, Measuring
‹› Measuring side clearance, refer to => [ Ring to Groove Clearance, Measuring ] See: Piston Ring/Testing and Inspection/Ring to Groove
Clearance, Measuring
Piston installed position