Distinguish between good and bad
The working surface of the piston ring shall not be engraved, abrasion, spalling, outer cylindrical surface and the upper and lower end face should-fixed finish, curvature deviation should not be greater than 0.02-0.04 mm, ring in the groove of the standard sinking amount of not more than 0.15-0.25 mm, the piston ring of elasticity, clearance to meet the requirements. In addition, should also check the piston ring light degree, the piston ring flat in the cylinder, put a small lamp on the bottom of the piston ring, put a mask above, and then observe the piston ring and cylinder wall between the light gap between the piston ring and the cylinder wall contact is good. In general, the rule measurement of the piston ring light should not exceed 0.03 mm. The length of the continuous light seam should not be greater than 1/3 of the cylinder diameter, and some light gap lengths should not be greater than 1/3 of the cylinder diameter, and the total length of some light should not exceed 1/2 of the cylinder diameter, otherwise, should be replaced.
Attention should be paid to the installation of piston rings
1 The Piston ring paperback into the cylinder sleeve, the interface should have a certain opening clearance.
2 The piston ring should be installed on the piston, in the ring groove, along the height direction must have a certain edge clearance.
3 Chrome ring should be installed in the first way, the openings do not on the piston top of the eddy-current concave hole direction.
4 Each piston ring openings in each other staggered 120 ℃, are not allowed to the piston pin hole.
5 Conical Section piston ring, the cone should be mounted upwards.
6 when the general torsion ring is installed, the chamfer or the notch should be upward;
7) When installing the combined ring, the axial lining ring should be installed first, and then the flat ring and the waveform ring should be fitted. The wave ring, the next each installed a flat ring, each ring openings should be staggered.