This article presents an in-depth analysis of wear processes occurring in plain bearings (liners) of internal combustion engines (ICEs), their causes, and their impact on performance. The types of abrasive, adhesive, fatigue, and corrosive wear observed on bearing surfaces are studied from a mechanical and tribological perspective. Modern technologies used for reconditioning worn bearings are also analyzed, and an improved repair method is developed. The proposed method improves engine reliability, extends its service life, and reduces operating costs.