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





Piston Ring Groove Clearance, Checking





Special tools, testers and auxiliary items required

• Feeler gauge

- Clean the ring grooves before checking.





Pistons, Checking





Special tools, testers and auxiliary items required

• External micrometer 75 to 100 mm

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

• Deviations from nominal dimension: 0.04 mm

Cylinder Bore, Checking





Special tools, testers and auxiliary items required

• Internal dial gauge 50 to 100 mm

Test Sequence

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

• Deviations from nominal dimension: 0.08 mm.

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