Chokutanga pane zvose, mhete yemhepo. Mhete yegesi inobata zvakananga gasi rinopisa nekupisa kwakanyanya uye kudzvanywa kwakanyanya, uye tembiricha yakakwira zvakanyanya panguva yekushanda. Iyo yakanyanya-tembiricha uye yakanyanya-kudzvanywa gasi rinopisa rinopinda mupiston ring groove kubva pakagero riri pakati pe cylinder madziro nepiston, uye inosangana nemafuta einjini anounzwa nekupomba kwepiston ring, izvo zvinozoita kuti mafuta akoke uye. solidify; uyezve, kana injini yamira, jekiseni rekupedzisira Mafuta anopinzwa mukamuri yekupisa haana kupiswa, uye pasi pechiito cheyakasara tembiricha yepiston, ichaitawo coke uye kusimba, uye pakupedzisira carbon deposits ichaumbwa uye yakaiswa mupiston ring groove. Iyi ndiyo nheyo yekugadzira gasi ring carbon deposition. Chete mumhete yemhepo, mafuta einjini anounzwa nekupomba kwechindori chepiston idiki kwazvo, uye mazhinji acho ndiyo kabhoni inoiswa nekupisa kusina kukwana kwepeturu. Kureva kuti, mazhinji emakabhoni akaiswa parin'i yegesi anokonzerwa nepeturu, uye kunaka uye kupisa kwepeturu kunokanganisa zvakananga huwandu uye hunhu hwekabhoni deposits.

Iyo piston mhete inogara ichikwira nekudzika mupiston ring groove, uye silinda haina kutenderera zvachose. Iyo piston inodzorera kumusoro uye pasi muhumburumbira, uye mhete yepiston inogara yakamanikidzwa uye yakatambanudzwa. Carbon deposits, inogara yakadzvanywa, haigone kuchengetwa, chete kabhoni deposits mugomba rekumashure rinogona kuramba. Mune mamwe mazwi, carbon deposits inongosara kune rumwe rutivi rwemhepo yemhepo, uye hazvibviri kuvhara mhete yemhepo kusvika pakufa, uye hazvibviri kuita kuti injini ipise mafuta. Panguva imwecheteyo, madhipoziti ekabhoni anoiswa mugeji rekumashure, izvo zvine hungwaru zvinoderedza gomba rekumashure, asi rinogona kusimbisa chisimbiso uye kuderedza mhedzisiro yekupomba.