Piston: Testing and Inspection

Piston Projection, Measuring at TDC

• Check the piston projection at TDC whenever installing a new piston or new part of the engine.

• If varying values occur when measuring the projection, use the cylinder head gasket for the largest value.

• Depending on the piston projection, install the cylinder head seal according to the following table.

Special tools, testers and auxiliary items required

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

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

• Dial Gauge (VAS 6079)

Procedure

- Mount the (VAS 6079) together with the (VW 382/7) and the (VW 385/17) 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).

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






Cylinder Head Seal Identification





1. Part number:

2. Holes

3. ignore.

• If varying values occur when measuring the projection, use the cylinder head gasket for the largest value.