Cylinder Block Assembly: Testing and Inspection

Piston, Rings and Cylinder Bore, Checking

Piston Ring Gap, Checking





Special tools, testers and auxiliary items required

• Feeler gauge

Test Sequence

- Push ring squarely from above down to approximately 15 mm from bottom end of cylinder. To do this use a piston without rings.






Piston Ring Groove Clearance, Checking





Special tools, testers and auxiliary items required

• Feeler gauge

- Clean ring groove before checking.






Pistons, Checking





Special tools, testers and auxiliary items required

• Micrometer 75 - 100 mm (VAS 6071)

- Take measurement approximately 6 mm from lower edge of piston skirt and offset 90° to piston axis.

• Deviations from nominal dimension: 0.04 mm

Cylinder Bore, Checking





Special tools, testers and auxiliary items required

• Cylinder Gauge (VAS 6078)

Test Sequence

- Measure diagonally at 3 positions transversely - A - and longitudinally - B -.

• Deviations from nominal dimension: 0.08 mm.

• Measurement of cylinder bore may not be performed when the cylinder block is mounted on engine and transmission holder (VAS 6095) or holding fixture (VW 540) , false measurements are possible.