Iyo piston mhete inoshanda mukupisa kwakanyanya, kudzvanywa kwakanyanya, kumhanya kwakanyanya, uye isina mafuta ekushanda nharaunda. Panguva imwecheteyo, inofanirwa kunge iine basa rakanaka rekuvhara, kukwesha kwemafuta, uye kupisa conduction mabasa. Inofanirwa kuve nechokwadi chekuita kwayo yekuisa chisimbiso uye kudzivirira mhete yepiston kuti isabatirwe mumhete yeGrooves nemasilinda, saka panofanirwa kunge paine mapeji matatu pakuisa mhete yepiston.

Pane mapeji matatu ekuyerwa kana ring yepiston yaiswa, anoti, maburi matatu eringi yepiston kwenguva pfupi. Yekutanga igeji rekuvhura, yechipiri iaxial gap (parutivi clearance), uye yechitatu iradial gap (kumashure gap). Ngatizivise nzira yekuyeresa yepiston mhete matatu mapundu:

Kuvhura gap
Kuvhurika ndiko pakakoromoka yemhete yepiston uye kuvhurwa mushure mekunge mhete yepiston yaiswa mucylinder kudzivirira mhete yepiston kuti isabatike mushure mekupisa nekuwedzera. Paunenge uchitarisa gap repiston rinopera, isa rin'i yepiston mucylinder woisundira nepamusoro pepiston. Wobva wayera mukaha pakuvhurwa negeji ukobvu, kazhinji 0.25 ~ 0.50mm. Pamusana pekushisa kwepamusoro kwekushanda, kupera kwekupedzisira kwemhete yekutanga yakakura kudarika yeimwe mhete.

Side gap
Side gap inoreva mukaha wepamusoro nechepazasi wemhete yepiston mugero remhete. Yakawandisa padivi gap inozokanganisa yekuisa chisimbiso yepiston, yakawandisa padivi gap piston mhete ichanamira mumhete groove. Panguva yekuyera, mhete yepiston inoiswa mugoro remhete uye kuyerwa negeji yekukora. Nekuda kwekushisa kwakanyanya kwekushanda, kukosha kwerin'i yekutanga kunowanzo 0.04 ~ 0.10mm, uye yemamwe magasi mhete kazhinji 0.03 ~ 0.07mm.Mugero weparutivi rwemhete yemafuta akajairika idiki, kazhinji 0.025 ~ 0.07mm, uye hapana gapu reparutivi remhete yemafuta akasanganiswa.

Back gap
Mukaha weshure unoreva mukaha uripo pakati pekuseri kwerin'i yepiston nepasi pepiston ring groove mushure mekunge piston yaiswa mucylinder. Iyo inowanzo kuratidzwa nemusiyano pakati pekudzika kwegroove uye ukobvu hwemhete, iyo inowanzoita 0.30 ~ 0.40mm. Kumashure gap rezvindori zveoiri zvakajairika rakakura. Muitiro wakajairika ndeyekuisa mhete yepiston mugoro remhete. Kana yakadzikira pane ring bank, inokwanisa kutenderedzwa zvakasununguka pasina kunzwa kurwadza.