How Long Can an Engine Last After Cylinder Boring?

[OJohnny]

Generally, a car engine can last about 3,000 kilometers after cylinder boring. Depending on the assembly condition, it may even last several hundred thousand kilometers. Cylinder boring is a process performed when the engine has been running for a long time, causing severe cylinder wear, which inevitably leads to "oil leakage." This results in symptoms like burning oil, reduced power, and increased fuel consumption, necessitating cylinder boring. Below are some key points about cylinder boring: 1. After cylinder boring, the engine requires a break-in period similar to a new car, covering 2,000 to 3,000 kilometers. The longevity depends on the extent of major repairs and part replacements. If the four key components (piston, piston rings, cylinder liner, and connecting rod bearings) are replaced, the crankshaft and bearings are in good condition, and the valve seals are renewed, the engine can run another 100,000 or even 200,000 kilometers without issues. 2. Cylinder boring is a common repair method for excessively worn dry cylinder liners. Since a thin layer of the cylinder wall is "polished" off, the cylinder diameter inevitably becomes slightly larger.