Cylinder Block Assembly: Testing and Inspection

Pistons and Cylinder Bore, Checking

Pistons, Checking





- With an external micrometer 75 to 100 mm. Take measurement at approximately 15 mm from lower edge of piston skirt and offset 90° to piston axis.

• Deviation from nominal size: Max. 0.04 mm.






Piston Ring Gap, Checking





- Push piston 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





- Clean the ring groove of piston before checking.






Cylinder Bore, Checking





Special tools, testers and auxiliary items required

• Inside Micrometer Set 18-100 mm (US1033/S)

• Internal Dial Gauge (VAS 6078)

• Engine and Transmission Holder (VAS 6095)


Do not bore, hone, grind or rework the cylinder bores with workshop tools. Reworking damages the surface of the cylinder bore.

- Using a (US1033/S) or (VAS 6078) measure in a diagonal sequence at 3 positions transversely - A - and longitudinally - B -.

• Deviation from nominal size: max. 0.08 mm.






• Measurement of cylinder bore may not be performed when the cylinder block is mounted in (VAS 6095) , false measurements are possible.