Operation CHARM: Car repair manuals for everyone.

Piston: Testing and Inspection



Piston, checking






Special tools

- Micrometer 75 to 100 mm (2.95 to 3.95 in.)

Measure pistons approx. 10 mm from the lower edge of skirt, at 90° angle to the piston pin axis.

- Deviation from nominal dimension max. 0.04 mm


Piston and cylinder dimensions

Honing Dimension, Piston And Cylinder Bore Diameter:






1) Dimension without graphite coating (thickness 0.02 mm). The graphite coating wears away.