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Piston and cylinder dimensions > < Pistons and conrods - exploded view

A3 Mk2

Measuring piston projection at „TDC“
Measuring piston projection at „TDC“
  Note
t  Piston projection at „TDC“ must be measured when installing new pistons or a short engine.
t  If the measured values for piston projection are not the same for all pistons, use the highest value to determine the correct cylinder head gasket size.
t  Depending upon piston projection, install the corresponding cylinder head gasket according to the table below.
   
Special tools and workshop equipment required
t  Measuring bridge -VW 382/7- from measuring tool -VW 382-
t  Measuring plate -VW 385/17- from universal measuring tool -VW 385-
t  Dial gauge -VAS 6079-

   
Procedure
–  Secure dial gauge -VAS 6079- with measuring bridge -VW 382/7- and measuring plate -VW 385/17- to cylinder block as shown in illustration.
–  Measure projection at each piston at both locations marked with -arrows- (seen in longitudinal direction of engine: at front and rear of piston).
–  Depending on piston projection, install corresponding cylinder head gasket according to following table:
  A13-10694
Piston projection above top surface of cylinder block
mm		Identification
(No. of holes)
0.91 … 1.001
1.01 … 1.102
1.11 … 1.203

   
Identification of cylinder head gasket
1 - Part number
2 - Holes
3 - Ignore
  Note
If the measured values for piston projection are not the same for all pistons, use the highest value to determine the correct cylinder head gasket size.
  A15-10508

Piston and cylinder dimensions > < Pistons and conrods - exploded view