Umda ongaphandle wesitywina se-oyile: irabha egqunyiweyo, umlebe otywiniweyo omfutshane kwaye uthambile, kunye nentwasahlobo, umlebe ongangenwa luthuli.
Olu hlobo lwe-Oil Seals lusetyenziswa ikakhulu kwiimeko apho kukho i-Oli kunye noxinzelelo, kunye ne-skeleton ye-Oil Seals TCV sisakhiwo siphela, ngoko ke ukuguqulwa komlomo phantsi koxinzelelo kuncinci, kwaye kufanelekile ukusetyenziswa kwiimeko apho I-axial diameter inkulu kwaye uxinzelelo luphezulu (ukuya kuthi ga kwi-0.89mpa).