How to check the piston ring?

1. Inspection of piston ring elasticity: piston ring elasticity is one of the important conditions to ensure cylinder sealing. Excessive or too small elasticity is not good and must meet technical requirements. Generally, piston ring elastic detector is used for detection. In practice, we generally use the method of holding hands to make a rough judgment, which can be used as long as it is not too loose. Do you know the piston ring, the part with the highest engine technology? 2. Inspection of the three gaps of the piston ring: put the piston ring into the cylinder, push it flat with the piston, and then check the size of the end gap with a thickness gauge, generally, it should be at 0. 2 ~ 0. Between 5mm ( Different models have different standards, and one ring and two rings are also different. See the maintenance manual for details). Install the piston ring on the piston and check the side clearance with a thickness gauge, which should generally be 0. 05 ~ 0. Between 10mm; The backlash is generally the depth of the piston ring groove minus the cross-sectional width of the piston ring, which is generally 0. 5 ~ 1. Between 0mm. If the three gaps are too large, the sealing effect will be affected. If they are too small, the piston ring will be stuck in the cylinder due to thermal expansion, and even the cylinder will be pulled out in serious cases. Do you know the piston ring, the part with the highest engine technology? 3. Light leakage inspection between the piston ring and the cylinder wall: in order to ensure the sealing effect of the piston ring, the outer surface of the piston ring is required to adhere to the cylinder wall everywhere. If the light leakage is too large, the local contact area of the piston ring is small, which is easy to cause excessive gas leakage and excessive oil consumption. There is a special equipment to detect the leakage degree of the piston ring. The general requirement is: no leakage point is allowed within the range of 30 degrees around the opening end of the piston ring. Light leakage on the same piston ring shall not be more than two places, the central angle corresponding to the length of light leakage arc at each place shall not exceed 25 degrees, and the total central angle corresponding to the length of light leakage arc on the same piston ring shall not exceed 45 degrees, the gap at the light leakage shall not be greater than 0. 03mm. If the above requirements are not met, piston rings or grinding cylinders need to be re-selected. Do you know the piston ring, the part with the highest engine technology, should be installed correctly and reliably, and pay attention to the opening position and direction of the ring. Generally, special tools should be used when installing piston rings, and manual installation is not recommended. Ensure that the opening positions of each ring are staggered (Generally staggered 180 °) Uniform distribution, while ensuring that the opening is not aligned with the position of the piston pin hole. Generally, there is an upward arrow or TOP sign on the side of the piston ring. This side must be installed upward. If it is installed reversely, it will lead to serious oil burning failure.

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