Audi Workshop Service and Repair Manuals > A4 Mk3 > Power unit | 4-cylinder TDI engine (2.0 ltr. 4-valve common rail - generation II), mechanics | Enginecrankshaft group, pistons | Pistons and conrods

Measuring piston projection at „TDC“

Note

Piston projection at „TDC“ must be measured when installing new pistons or a short engine.

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 piston projection at two points marked with -arrows- for each piston.

Note

If the measured values for piston projection are not the same for all pistons, use the highest value to determine the correct gasket size.

–	Depending on piston projection, install corresponding cylinder head gasket according to following table:

Piston projection above top surface of cylinder block mm	Identification (No. of holes)
0.91 … 1.00	1
1.01 … 1.10	2
1.11 … 1.20	3

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 gasket size.

Audi Workshop Service and Repair Manuals