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Checking radial clearance of conrod bearings > < Checking piston projection at "TDC”

A4 Cabriolet Mk2

Piston and cylinder dimensions
   
Piston and cylinder dimensions
Piston identificationPiston ØCylinder bore Ø
Basic dimensionI → Note78.253 … 78.261 → Note78.306 … 78.310
 II → Note78.259 … 78.267 → Note78.310 … 78.314
Intermediate sizeI → Note78.293 … 78.301 → Note78.346 … 78.350
 II → Note78.299 … 78.307 → Note78.350 … 78.354

1)  Piston identification is stamped on piston crown.
2)  Dimensions not including graphite coating (thickness 0.02 mm). The graphite coating on the piston skirt wears down in service.
   
Piston identification on piston crown
Piston identification is stamped on piston crowns -arrow-.
  Note
Replacement pistons are only available with basic dimension.
  A13-0201

Checking radial clearance of conrod bearings > < Checking piston projection at "TDC”