Shira impeta ya piston iringaniye muri silinderi, usunike impeta iringaniye hamwe na piston ishaje (mugihe uhinduye impeta kugirango usanwe byoroheje, uyisunike kumwanya aho impeta ikurikira igenda yerekeza hasi), hanyuma upime icyuho cyo gufungura nubunini igipimo.

Niba icyuho cyo gufungura ari gito cyane, koresha dosiye nziza kugirango utange bike kumpera yo gufungura. Igenzura kenshi rigomba gukorwa mugihe cyo gusana dosiye kugirango wirinde gufungura kuba binini, kandi gufungura bigomba kuba binini. Iyo gufungura impeta bifunze kugirango bipimishe, ntihakagombye gutandukana; impera yatanzwe igomba kuba idafite burrs.

Reba inyuma, shyira impeta ya piston mumurongo wimpeta hanyuma uzenguruke, hanyuma upime icyuho hamwe nubunini bwimbitse utatanze pin. Niba gusiba ari bito cyane, shyira impeta ya piston ku isahani iringaniye itwikiriye imyenda ya emery cyangwa isahani yikirahure itwikiriwe numusenyi hanyuma usya neza.

Reba inyuma hanyuma ushyire impeta ya piston mumurongo wimpeta, impeta iri munsi ya banki ya groove, naho ubundi impeta yimpeta igomba guhinduka kumwanya ukwiye.