Qinisekisa izixhumanisi ezi-3 eziphuzi ochungechungeni lwesikhathi. Faka uchungechunge lwesikhathi kanye ne-crankshaft sprocket. Isixhumanisi sokuqala esiphuzi siqondanisa uphawu lwesikhathi lwe-crankshaft sprocket. Qaphela: Kunezixhumanisi ezintathu eziphuzi ochungechungeni lwesikhathi. Izixhumanisi ezimbili eziphuzi (ezinomehluko wezixhumanisi ezi-6) ziqondaniswe nezimpawu zesikhathi zama-sprockets we-camshaft owuthathayo kanye ne-exhaust camshaft.

Uma ijubane lenjini lehla, isilawuli sesikhathi se-valve esishintshashintshayo siyehla, iketango eliphezulu liyaxega, bese iketango elingezansi lisebenza ekudonseni kwe-exhaust cam kanye nokuphonsela phansi kwesilawuli. Ngenxa yokuthi i-exhaust camshaft ayikwazi ukujikeleza ngokuphambene newashi ngaphansi kwesenzo sebhande lesikhathi se-crankshaft, i-camshaft yokufaka ingaphansi kwenhlanganisela yamandla amabili: enye iwukuthi ukujikeleza okuvamile kwe-exhaust camshaft kushayela amandla okudonsa eketanga eliphansi; enye ithi I-regulator iphusha iketango futhi idlulisele amandla okudonsa ku-exhaust cam. I-camshaft yokungenisa izungeza i-engeli eyengeziwe θ ngokwewashi, esheshisa ukuvala kwevalvu yokudonsa, okungukuthi, i-engeli yokuvala yevalve sekwephuzile yehliswa ngamadigri angu-θ. Lapho ijubane landa, umlawuli uyakhuphuka futhi iketanga eliphansi likhululekile. I-exhaust camshaft izungeza ngokwewashi. Okokuqala, iketango eliphansi kufanele liqiniswe ukuze libe unqenqema oluqinile ngaphambi kokuba i-camshaft yokungenisa ingaqhutshwa ukuze ijikeleze nge-exhaust camshaft. Enqubeni yeketango elingezansi liyaxega futhi liqine, i-exhaust camshaft izungeza nge-engeli θ, ikhamera yokudonsa iqala ukunyakaza, futhi ukuvala kwevalvu yokudonsa kuba kancane.

Okulandelayo okokufundisa kokufaka kochungechunge lwesikhathi:
1. Okokuqala qondanisa uphawu lwesikhathi ku-sprocket ye-camshaft nophawu lwesikhathi kukhava yokuthwala;
2. Vula i-crankshaft ukuze ipiston yesilinda esisodwa sibe sendaweni efile ephezulu;
3. Faka uchungechunge lwezikhathi ukuze uphawu lwesikhathi lweketango luqondaniswe nophawu lwesikhathi ku-sprocket ye-camshaft;
4. Faka i-sprocket ye-oil pump drive ukuze uphawu lwesikhathi lweketango luhambisane nophawu lwesikhathi ku-sprocket yepompo kawoyela.