Piston Projection, Measuring At TDC

WARNING: This page is about a different car, the 2016 Audi Q5, 2015 Audi Q5, and 2014 Audi Q5. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Measure the piston projection at Top Dead Center (TDC) whenever installing a new piston or new part of the engine.

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 - 0-10mm VAS6079

Procedure

Fig 1: Measuring Piston Projection At Top Dead Center (TDC)

Courtesy of AUDI OF AMERICA, LLC

-- Secure the Dial Gauge - 0-10mm VAS6079 with the Measuring Bar VW382/7 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 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.