在其它条件相同的情况下,发动机缸套寿命实质上取决于制造偏差、缸套螺栓紧度的不均匀性、工作时热应力和机械应力。这些数值都要予以考虑,尤其在选配活塞与缸套之间的间隙时,要考虑缸套的原始椭圆度,以及用螺栓拧紧缸盖过程中缸套发生的变形。修理发动机时,若更换活塞环、活塞或镗削缸套,则要考虑后者的大椭圆度等等。然而实践表明,传统手段测定缸套椭圆度 Under the same conditions, engine cylinder liner life depends essentially on manufacturing variations, cylinder liner tightness, thermal stress and mechanical stress during operation. These values ​​must be taken into account. In particular, the clearance between the piston and cylinder liner should be taken into consideration, taking into account the original ovality of the cylinder liner and the deformation of the cylinder liner during bolting of the cylinder head. When repairing the engine, if you replace the piston ring, piston or boring cylinder liner, consider the latter’s large ovality and so on. However, practice shows that the traditional measure of cylinder liner ovality