A3 Quattro V6-3.2L (CBRA) (2009)
‹› Measure radial clearance with Plastigage
‹› Do not turn crankshaft when measuring radial play
‹› Radial clearance, new: 0.02 to 0.07 mm; wear limit: 0.10 mm
‹› Replacement parts are color coded "yellow" for lower and "red" for upper
4
Connecting Rod
‹› With oil hole for piston pin lubrication
‹› Only replace as set
‹› Affiliation to the cylinder mark - B -
‹› Installation position: Mark - A - faces toward the shallow side of the piston (the shallow side of the piston head faces the cylinder block center)
5
Circlip
6
Piston Pin
‹› If tight, heat piston to 60 °C / 140 °F
‹› Removing and installing using a drift (VW 222 A )
7
Piston
‹› Mark installed location to connecting rod and affiliation to cylinder
‹› Shallow side of piston head faces cylinder block center
‹› Piston and cylinder dimensions, refer to => [ Piston and Cylinder Dimensions ] See: Piston/Specifications
‹› Install using piston insertion funnel (T10147).
8
Piston Rings
‹› Compression rings
‹› Offset gaps by 120°
‹› Use piston ring pliers for removal and installation
‹› Mark "TOP" must face toward piston head
‹› Checking ring gap.
‹› Check piston ring groove clearance.
9
Piston Ring
‹› Oil scraping ring
‹› 3-part
‹› Install upper steel ring so gap is offset by 120° to neighboring compression ring
‹› Offset all oil scraping ring component gaps to each other
Piston Ring Gap, Checking