Piston Projection, Measuring At Top Dead Center (TDC)

WARNING: This page is about a different car, the 2016 Audi A7 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Measuring Bar :VW382/7 from the Special Socket & Measuring Tools :VW382
Measuring Set - Magnetic Plate - 50mm :VW385/17 from Measuring Set :VW385
Dial Gauge - 0-10 mm :VAS6079

NOTE:

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

-- Secure the :VAS6079 with the :VW382/7 and :VW385/17 to the cylinder block, as illustrated below.

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

Courtesy of AUDI OF AMERICA, LLC

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

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.