A: After the cylinder liner is worn, the cylinders are not equal. In this case, in addition to the reciprocating motion of the piston ring, the piston ring also has a one-to-one motion in the ring groove, so that the upper and lower plane motion of the ring groove is also intensified. The wear of the ring groove is generally worn from the rectangular shape into a trapezoidal shape due to the radial movement of the piston ring in the groove, the collision of the piston ring when the piston is up and down, and corrosion. It turns out that the first two rings on the piston wear much more quickly than the other ring grooves. Under normal conditions, the height of the ring groove increases by 0.01 mm for every 1000 hours of engine operation.
