Piston Projection, Measuring At "TDC"

WARNING: This page is about a different car, the 2011 Audi Q7, 2010 Audi Q7, and 2009 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Check the piston projection at "TDC" whenever Installation a new piston or new part of the engine. Depending on the piston projection, install the corresponding cylinder head gasket according to the following table.

If varying values occur when measuring the projection, use the gasket for the largest value.

The cylinder head gasket must be determined for each cylinder bank removed.

Special tools and workshop equipment required

Measuring BarVW382/7 from Special Socket & Measuring ToolsVW382
Measuring Set - Magnetic Plate - 50mmVW385/17 from Measuring SetVW385
Dial Gauge - 0-10mmVAS6079

Procedure

Fig 1: Identifying Measuring Bar VW 382/7 And VW 385/17 On Cylinder Block

Courtesy of AUDI OF AMERICA, LLC

-- Attach the Dial Gauge - 0-10mmVAS6079 with Measuring BarVW382/7 and Measuring Set - Magnetic Plate - 50mmVW385/17 to the cylinder block.

-- Measure the projection on each piston at both spots identified with -arrows- (at the front and back of the piston).

Piston Projection Above the Upper Edge of the Cylinder Block mm	Identification Holes
0.39 to 0.49	1
0.49 to 0.54	2
0.54 to 0.65	3

Cylinder Head Seal Identification

Fig 2: Cylinder Head Gasket Identification

Courtesy of AUDI OF AMERICA, LLC

Holes
Part Number

NOTE:

The cylinder head gaskets for the left and right cylinder head cannot be interchanged because they each have a different shape.