Piston: Testing and Inspection

Piston, Piston Rings and Cylinder Bore, Checking





Piston Ring Gap, Checking

Special tools, testers and auxiliary items required
^ Feeler gauge

- Insert ring into lower cylinder opening at a right angle from above, approximately 15 mm from cylinder edge.








Piston Ring Groove Clearance, Checking

Special tools, testers and auxiliary items required
^ Feeler gauge

- Before measuring, clean ring groove.








Pistons, Checking

Special tools, testers and auxiliary items required
^ External micrometer 75 to 100 mm

- Take measurement approximately 10 mm from lower edge of piston skirt and offset 90° to piston axis.

Deviation from nominal dimension: max. 0.04 mm





Cylinder Bore, Checking

Special tools, testers and auxiliary items required
^ Internal dial gauge 50 to 100 mm

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

Deviation from nominal size: max. 0.08 mm

Note:
^ Cylinder bore measurement must not be performed if cylinder block is secured to assembly stand with holding fixture VAS 6095, since inaccurate measurements are possible.