Piston: Testing and Inspection

Piston Projection, Measuring at TDC

• Check the piston projection at Top Dead Center (TDC) whenever installing 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, testers and auxiliary items required

• Measuring Bar (VW 382/7) from Special Socket and Measuring Tools (VW 382)

• Magnetic Plate 50 mm Dia. (VW 385/17) from Universal Measuring Tool (VW 385)

• Dial Gauge 0-10 mm (VAS 6079)

Procedure

- Attach the (VAS 6079) with measuring bar (VW 382/7) and the (VW 385/17) to the cylinder block.






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






Cylinder Head Seal Identification






1. Holes

2. Part number:


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