How to distinguish between positive and negative piston ring installation in Yuchai 6 105, and the water seal ring of cylinder liner is reverse?

Only the first ring (bright) and the second ring (not bright) of Yuchai engine piston ring are oriented, and the third ring is not oriented.

Identification: You can pick up the piston ring and carefully look at the mark on the connecting side of the piston ring. The side printed with the word "TOP" faces the top surface of the piston. Then, you can open the piston ring mouth by hand and install three piston rings in turn.

After installing the piston ring, the opening positions of the three rings should be adjusted before installing it in the engine cylinder hole. After adjusting the interval between two adjacent rings by about 120, before installing the piston, some clean engine oil should be added to the cylinder liner for pre-lubrication.