How to identify the quality of the piston ring?

The working surface of the piston ring shall not be scratched, scratched or peeled off, and the outer cylindrical surface and the upper and lower end surfaces shall be-Set finish, curvature deviation should not be greater than 0. 02-0. 04mm, the standard sinking amount of the ring in the groove shall not exceed 0. 15-0. 25mm, the elastic force and clearance of the piston ring conform to the regulations. In addition, the leakage light of the piston ring should also be checked, I . e. the piston ring should be placed flat in the cylinder, a small lamp gun should be placed under the piston ring, and a light shielding plate should be placed on it, then observe the light leakage gap between the piston ring and the cylinder wall, thus knowing whether the contact between the piston ring and the cylinder wall is good. Under normal circumstances, the light leakage seam of piston ring measured with thickness gauge should not exceed 0. 03mm. The length of continuous light leakage joint should not be greater than 1/3 of the diameter of the cylinder, the length of several light leakage gaps should not be greater than 1/3 of the diameter of the cylinder, and the total length of several light leakage joints should not exceed 1/2 of the diameter of the cylinder, otherwise, it should be replaced. Piston ring mark GB/T 1149. 1- 94 regulations: all piston rings requiring installation direction shall be marked on the upper side, I . e. near the side of the combustion chamber. The ring marked on the upper side includes: conical surface ring, inner chamfer, outer cutting table ring, nose ring, wedge ring and oil ring requiring installation direction. The upper side of the ring is marked.

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