Piston Projection, Measuring At Top Dead Center (TDC): Procedure

WARNING: This page is about a different car, the 2015 Audi A7 Quattro and 2014 Audi A7 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

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 - 0-10 mm VAS 6079 with the Measuring Bar VW 382/7 and Measuring Set - Magnetic Plate - 50 mm VW 385/17 to the cylinder block, as shown.

-- 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