What Causes Engine Cylinder Liner Wear?
2 Answers
Engine cylinder liner wear can be attributed to the following reasons: 1. Insufficient lubrication. The working environment of the vehicle is relatively harsh, adjacent to the combustion chamber with high temperatures. Fresh air and unvaporized fuel can wash and dilute the lubricant, exacerbating the deterioration of upper conditions, causing the cylinder to operate in a state of dry or semi-dry friction. Insufficient lubrication may accelerate wear. 2. Aging of the air filter. The primary function of the air filter is to remove impurities such as dust and sand from the air, thereby reducing wear on components like the cylinder, piston, and piston rings. However, when the air filter is aged or clogged with dust, its filtering efficiency significantly decreases, leading to accelerated wear of the cylinder liner. 3. Prolonged operation at low temperatures. During winter or at low speeds, the engine often operates at low temperatures. This can easily result in poor combustion, causing carbon deposits to spread from the upper part of the cylinder liner, leading to severe abrasive wear in the upper section. 4. Improper installation of the cylinder liner. During installation, if there are errors such as misalignment between the cylinder centerline and the crankshaft axis, it can cause abnormal wear on the cylinder liner. A bent or deformed crankshaft connecting rod can also accelerate cylinder liner wear.
I used to deal with this every day at the auto repair shop. Cylinder liner wear is most commonly caused by lubricating oil issues. Poor oil quality or excessively delayed oil change intervals make the oil film unable to withstand metal friction. I once had a customer who used counterfeit oil to save money, and the cylinder walls were scored by 30,000 kilometers. It's even worse if the air filter is broken and not replaced in time—dust and sand particles mix into the cylinder and act as abrasives directly. Cold starts in winter are the most damaging to the engine, as the piston starts dry grinding before the oil is pumped up. When boring the cylinder, I noticed the wear patterns are all slanted, which is caused by uneven piston ring pressure distribution. Also, be wary of abnormal water temperature—thermal expansion and contraction cause the fit clearance to fluctuate, accelerating wear.
