Abstract: Particle contaminated lubricating oil has a great effect on the performance of piston-liner. Sand and dust climates are typical in Western China, which are simulated by a self-built test bed. Taking piston-liner, an important friction pair in internal-combustion engine, as research object, experiments are planned and performed considering the effect of sand and dust for liner. Surface morphology of the inner surface of liner is measured after running-in, 100 hours running under normal condition and 100 hours running under sand and dust contaminated condition respectively. By analyzing the test results, conclusions are obtained that the presence of sand and dust in lubricating oil destroy the lubricating condition of the piston-liner, speeds up the wear of liner, especially on the major thrust side, and increases partial wear greatly. Ferrographic analyses of used lubricating oil also testify to the abrasion of liner caused by sand and dust particles. The experiment results provide practical help for further theoretical research of the effect that sand and dust contaminated lubricating oil has on liner in engine.

Key words: Cylinder liner, Particle, Surface morphology, Wear