What does engine cylinder sticking mean?

[LucasMarie]

Engine cylinder sticking refers to the situation where the piston and cylinder experience increased friction and cease to function properly due to high temperatures or insufficient lubrication from engine oil. During the friction process between the piston and cylinder, if the clearance between them is too small, it can lead to insufficient oil film formation, resulting in dry friction and ultimately cylinder sticking. This issue can be resolved by replacing the relevant components. However, when replacing the cylinder liner and piston, it is important to select a piston and cylinder liner from the same group number. Before installing the new cylinder liner and piston, it is advisable to measure them using a bore gauge and micrometer to ensure the clearance meets specifications. If a bore gauge and micrometer are not available, a feeler gauge can also be used. The measurement method involves inserting the feeler gauge blade into the clearance between the cylinder and piston skirt (in the direction perpendicular to the piston pin installation) and then pulling the blade. The ideal condition is when there is slight resistance but the blade can still be moved flexibly.