PISTON PROJECTION, MEASURING AT "Top Dead Center (TDC)"

WARNING: This page is about a different car, the 2015 Audi Q7, 2014 Audi Q7, and 2013 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Measure the piston projection at "TDC" whenever installing a new piston or new part of the engine.

Special tools and workshop equipment required

Measuring BarVW382/7 from the 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

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

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

NOTE:

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.

-- Depending on the piston projection, install the correct cylinder head seal according to the following table:

Piston Projection Above the Upper Edge of the Cylinder Block	Identification Holes
0.82 to 0.92 mm	1
0.92 to 0.97 mm	2
0.97 to 1.08 mm	3

Cylinder Head Seal Identification

Fig 2: Cylinder Head Gasket Identification

Courtesy of AUDI OF AMERICA, LLC

Part Number
Holes

NOTE:

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