Kuthamanga kwa mafuta mu injini yamagalimoto
Zamkatimu
- Alamu yamphamvu yamafuta
- Kuthamanga kwamafuta osakwanira mu injini
- Zifukwa zochepetsera kuthamanga
- Mulingo wamafuta ochepa
- Kusintha mafuta nthawi yomweyo
- Kusagwirizana kwamtundu wamafuta ndi malingaliro a wopanga
- Video: kukhuthala kwamafuta agalimoto
- Video: kukhuthala kwa mafuta - mwachidule za chinthu chachikulu
- Kulowetsa kwa antifreeze, mpweya wotulutsa kapena mafuta mumafuta
- Pampu yamafuta sikugwira ntchito
- Kuvala kwa injini zachilengedwe
- Zifukwa zochepetsera kuthamanga
- Momwe mungawonjezere kuthamanga kwamafuta a injini
- Momwe mungayesere kuthamanga kwamafuta a injini
Injini yoyaka mkati mwagalimoto, monga mukudziwa, imakhala ndi magawo ambiri osuntha omwe amalumikizana. Ntchito yake idzakhala zosatheka popanda mafuta apamwamba azinthu zonse zopaka. Kupaka mafuta sikungochepetsa mikangano ndi zigawo zazitsulo zoziziritsa, komanso zimawateteza ku madipoziti omwe amawonekera pakugwira ntchito. Kuonetsetsa kuti injini ikugwira ntchito modalirika, ndikofunikira kuti kukakamiza kwamafuta kusungidwe mkati mwamitundu yomwe opanga amafotokozera m'njira zonse. Kuthamanga kwamafuta osakwanira kapena ochulukirapo mu injini posachedwa kungayambitse kuwonongeka kwake. Pofuna kupewa mavuto aakulu okhudzana ndi kukonzanso kwamtengo wapatali, muyenera kuzindikira vutolo panthawi yake ndikuchotsa nthawi yomweyo.
Zamkatimu
- 1 Alamu yamphamvu yamafuta
- 1.1 Yang'anani alamu
- 2 Kuthamanga kwamafuta osakwanira mu injini
- 2.1 Zifukwa zochepetsera kuthamanga
- 2.1.1 Mulingo wamafuta ochepa
- 2.1.2 Kusintha mafuta nthawi yomweyo
- 2.1.3 Kusagwirizana kwamtundu wamafuta ndi malingaliro a wopanga
- 2.1.4 Video: kukhuthala kwamafuta agalimoto
- 2.1.5 Video: kukhuthala kwa mafuta - mwachidule za chinthu chachikulu
- 2.1.6 Kulowetsa kwa antifreeze, mpweya wotulutsa kapena mafuta mumafuta
- 2.1.7 Pampu yamafuta sikugwira ntchito
- 2.1.8 Kuvala kwa injini zachilengedwe
- 3 Momwe mungawonjezere kuthamanga kwamafuta a injini
- 3.1 Zomwe zimagwiritsidwa ntchito kuti muwonjezere kuthamanga kwa mafuta
- 4 Momwe mungayesere kuthamanga kwamafuta a injini
- 4.1 Table: pafupifupi kuthamanga kwamafuta mumainjini omwe angagwiritsidwe ntchito
- 4.2 Video: kuyeza kuthamanga kwamafuta mu injini yamagalimoto
Alamu yamphamvu yamafuta
Pa chida cha galimoto iliyonse pali chizindikiro cha kuthamanga kwa mafuta mwadzidzidzi, mwa kuyankhula kwina, babu. Nthawi zambiri amawoneka ngati chidebe chamafuta. Ntchito yake ndikudziwitsa dalaivala nthawi yomweyo kuti kuthamanga kwa mafuta kwatsika kwambiri. Chipangizo cholumikizira chimalumikizidwa ndi sensor yamafuta, yomwe ili pa injini. Pakachitika alamu yachangu yamafuta, injini iyenera kuyimitsidwa nthawi yomweyo. Itha kuyambiranso vutolo litakonzedwa.
Nyaliyo isanayatse, imatha kung'anima pang'onopang'ono, chomwenso ndi chizindikiro cha kuchepa kwamafuta. Ndi bwino kuti musachedwetse yankho la vutoli, koma kuti muzindikire mwamsanga vutolo.
Yang'anani alamu
Pa ntchito yachibadwa ya injini, chizindikiro sichiyatsa, choncho funso likhoza kubwera, kodi ili bwino? Ndizosavuta kuyang'ana ntchito yake. Kuyatsa kukayatsidwa, musanayambe injini, zida zonse zowonetsera pagulu la zida zimayatsa muyeso. Ngati kuwala kwamafuta akuyaka, ndiye kuti chizindikirocho chikugwira ntchito.
Kuthamanga kwamafuta osakwanira mu injini
Pazifukwa zingapo, kuthamanga kwa mafuta mu injini kumatha kuchepa, zomwe zimapangitsa kuti magawo ena a injini alandire mafuta osakwanira, i.e. njala yamafuta. Injini idzagwira ntchito mowonjezereka kwa magawo ndipo pamapeto pake idzalephera.
Zifukwa zochepetsera kuthamanga
Ganizirani zifukwa zomwe zingayambitse kuchepa kwa mafuta.
Mulingo wamafuta ochepa
Kusakwanira kwa mafuta mu injini kumabweretsa kuchepa kwa kuthamanga kwake komanso kuchitika kwa njala yamafuta. Mulingo wamafuta uyenera kuyang'aniridwa pafupipafupi, kamodzi pa sabata. Kuti achite izi, ma injini ali ndi kafukufuku wapadera wokhala ndi sikelo yovomerezeka.
- Ikani galimotoyo pamtunda wapamwamba kuti pasakhale cholakwika cha muyeso. Ndi bwino ngati galimoto ili mu garaja ndi pansi lathyathyathya.
- Imitsani injini ndikudikirira mphindi 3-5 kuti mafuta alowe mu poto yamafuta.
- Chotsani dipstick ndikupukuta ndi chiguduli.
- Ikani dipstick pamalo ake mpaka itayima ndikuchikokanso.
- Yang'anani pa sikelo ndikuwona kuchuluka kwa mafuta pa dipstick.
Ngati mulingo wamafuta mu injiniyo ndi wotsika kwambiri, uyenera kuwonjezeredwa, koma yang'anani kaye kuti injiniyo yatuluka. Mafuta amatha kuyenda kuchokera pansi pazigawo zilizonse: kuchokera pansi pa poto yamafuta, chisindikizo chamafuta a crankshaft, pampu yamafuta, fyuluta yamafuta, ndi zina zambiri. Nyumba ya injini ayenera kukhala owuma. Kutayikira komwe kwadziwika kuyenera kuthetsedwa posachedwa, pomwe kuyendetsa galimoto kuyenera kuchitika pokhapokha pakufunika.
Ma injini akale okalamba nthawi zambiri amavutika ndi vuto la kutaya mafuta, lomwe limatchedwa "kuchokera ku ming'alu yonse." Pankhaniyi, n'zovuta kuthetsa magwero onse kutayikira, n'zosavuta kukonzanso injini, ndipo izi, ndithudi, sizingakhale zotsika mtengo. Chifukwa chake, ndikwabwino kuyang'anira kuchuluka kwamafuta nthawi zonse, kuwonjezera ngati kuli kofunikira, ndikuthetsa zizindikiro zoyamba za kutayikira.
Kusintha mafuta nthawi yomweyo
Mafuta a injini ali ndi gwero linalake la ntchito. Monga lamulo, imasinthasintha pamtunda wa makilomita 10-15, koma pali zosiyana pamene mafuta amafunika kusinthidwa nthawi zambiri, malingana ndi zofunikira za wopanga ndi momwe injiniyo ilili.
Mafuta a injini amakono amagwira ntchito yofunika kwambiri pakugwira ntchito kwa injini, amateteza ziwalo zonse modalirika, amachotsa kutentha, amavala zinthu kuchokera kumagulu opaka, ndikuchotsa mpweya wa carbon. Mafutawa ali ndi zowonjezera zingapo zomwe zimapangidwira kukulitsa zina mwazinthu zake kuti chitetezo cha injini chikhale chodalirika.
Pa ntchito, mafuta amataya makhalidwe ake. Mafuta omwe atha gwero lake amakhala ndi kuchuluka kwa mwaye ndi zitsulo zosefera, amataya chitetezo chake ndikumakula. Zonsezi zimapangitsa kuti mafutawo asiye kuyenda kudzera munjira zopapatiza kupita kumalo opaka. Ngati galimotoyo sikugwiritsidwa ntchito pang'ono ndipo mtunda wovomerezeka sunadutsidwe m'chaka, mafuta ayeneranso kusinthidwa. Mafuta amafuta amakhala oti akalumikizana kwanthawi yayitali ndi zida za injini, amakhala osagwiritsidwa ntchito.
Kuwonongeka kwa mtundu wa mafuta ndi kuchuluka kwa injini zovala ndi njira zomwe zimapangitsa kuti wina achuluke. Ndiko kuti, mafuta osauka, omwe amachititsa kuti ziwalozo zikhale bwino, zimapangitsa kuti ziwonjezeke, ndipo panthawi yovala, zitsulo zambiri zachitsulo ndi madipoziti zimawonekera, ndikuipitsanso mafuta. Kuvala kwa injini kukukula kwambiri.
Kusagwirizana kwamtundu wamafuta ndi malingaliro a wopanga
Mafuta a injini ayenera kufanana ndendende ndi mawotchi, matenthedwe ndi mankhwala omwe injini imakhala nawo pakugwira ntchito. Chifukwa chake, mafuta amagalimoto amagawidwa m'mitundu ingapo malinga ndi cholinga chawo:
- kwa injini za dizilo kapena mafuta, palinso zinthu zapadziko lonse lapansi;
- mchere, semi-synthetic ndi kupanga;
- dzinja, chilimwe ndi nyengo zonse.
Opanga injini amalimbikitsa mitundu ina yamafuta kuti agwiritsidwe ntchito mu iliyonse yaiwo; malingaliro awa ayenera kutsatiridwa. Zambiri zokhudzana ndi mtundu wa mafuta zingapezeke mu malangizo ogwiritsira ntchito galimoto kapena pa mbale yapadera mu chipinda cha injini.
Kupatula apo, mafuta onse ali ndi mawonekedwe akuthupi monga mamasukidwe akayendedwe. Nthawi zambiri amawonetsedwa ngati malingaliro. Viscosity ndi katundu wa mafuta omwe amadalira kukangana kwamkati pakati pa zigawo zake. Powotcha, kukhuthala kumatayika, i.e. mafuta amakhala madzi, ndipo mosiyana, ngati mafuta atakhazikika, amakhala wandiweyani. Ichi ndi gawo lofunika kwambiri lomwe limakhazikitsidwa ndi wopanga injini, poganizira mipata yaukadaulo pakati pa magawo opaka ndi kukula kwa ngalande zake zamafuta. Kulephera kutsatira chizindikiro ichi kudzachititsa kuti makina odzola asamayende bwino, motero, kulephera kwa injini ndi kulephera.
Mwachitsanzo, titha kutchula malingaliro a wopanga posankha mafuta a injini pagalimoto ya VAZ 2107. Malinga ndi bukhu lautumiki, mafuta omwe ali ndi magiredi osiyanasiyana a SAE viscosity ayenera kugwiritsidwa ntchito kutengera kusinthasintha kwanyengo mu kutentha kozungulira:
- 10W-30 kuchokera -25 mpaka +25 °C;
- 10W-40 kuchokera -20 mpaka +35 °C;
- 5W-40 kuchokera -30 mpaka +35 °C;
- 0W-40 kuchokera -35 mpaka +30 °C.
Kuthamanga kwa mafuta mu injini mwachindunji kumadalira kutsata kwa mtundu wa mafuta omwe amagwiritsidwa ntchito ndi malingaliro a wopanga. Mafuta wandiweyani kwambiri sangadutse bwino pamakina a injini yopangira mafuta, yopangidwira kuonda. Mosiyana ndi zimenezi, mafuta woonda kwambiri sangakulole kuti muyambe kugwira ntchito mu injini chifukwa cha madzi ake owonjezera.
Video: kukhuthala kwamafuta agalimoto
Pofuna kupewa mavuto ndi kuthamanga kwa mafuta, malamulo otsatirawa ayenera kutsatiridwa:
- gwiritsani ntchito mafuta ofunikira kuchokera kwa wopanga wodalirika komanso wodalirika;
- sinthani mafuta pasanathe nthawi kapena mtunda womwe wopanga amalimbikitsa, komanso nthawi zambiri pakuwonjezeka kwa magalimoto;
- kusintha mafuta nthawi zambiri mu injini ndi mkulu mtunda. Ma injini oterowo achulukitsa chilolezo m'masilinda, kotero kuti mafuta amayenera kusonkhanitsa mwaye ndi mwaye, motero, amachoka m'malo mwake;
- onetsetsani kuti mwayika fyuluta yatsopano yamafuta pamodzi ndi kusintha kwamafuta;
- musasakaniza mafuta amitundu yosiyanasiyana, ngakhale amtundu umodzi. Opanga mafuta amagwiritsa ntchito zowonjezera zamitundu yosiyanasiyana, zomwe zingayambitse kukhudzidwa kwa mankhwala ndi kutayika kwa khalidwe lawo. Mafuta amathanso kutulutsa thovu, ndipo izi ndizosavomerezeka kwa injini;
- simuyenera kuthiranso injini mukatha kukhetsa mafuta ogwiritsidwa ntchito ngati mukufuna kudzaza mafuta amtundu womwewo komanso munthawi yake. Flushing kungayambitse kuphwanya chitetezo wosanjikiza pamwamba pa zigawo analengedwa ndi zapadera zina mu mafuta;
- musagwiritse ntchito zowonjezera zowonjezera popanda kufunikira, izi zikhoza kusokoneza ntchito yamagulu oyenerera omwe amawonjezeredwa ku mafuta ndi wopanga.
Video: kukhuthala kwa mafuta - mwachidule za chinthu chachikulu
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Kulowetsa kwa antifreeze, mpweya wotulutsa kapena mafuta mumafuta
The ingress yamadzimadzi kuchokera ku kuzirala kapena mpweya wotulutsa mpweya mu injini yopangira mafuta ndizotheka ngati kuwonongeka kwa silinda mutu gasket.
Nthawi zina mafuta amalowa m'mafuta chifukwa cha kulephera kwa nembanemba ya pampu yamafuta. Kuti mudziwe kukhalapo kwa petulo mu mafuta, m'pofunika kufufuza mosamala dontho la mafuta kuchokera ku injini, madontho owoneka bwino ayenera kuwonekera pa izo. Kuphatikiza apo, mipweya yotulutsa mpweya imanunkhira ngati mafuta. Samalani, kutulutsa mpweya wotuluka sikotetezeka ku thanzi lanu.
Kuchepetsedwa ndi madzi achilendo, komanso, mankhwala ogwiritsidwa ntchito, kapena mpweya wotulutsa mpweya, mafuta amatha kutaya kukhuthala ndi zinthu zina zofunika. Chitoliro chopopera chimatulutsa utsi woyera kapena wabuluu. Ndi bwino kwambiri osafunika ntchito galimoto mu nkhani iyi. Pambuyo powonongeka, mafuta mu injini ayenera kusinthidwa ndi atsopano, mutatha kutsuka galimoto.
Silinda yamutu wa gasket nawonso sungathe kudutsa yokha, makamaka izi ndi chifukwa cha kutentha kwa injini, kuphulika kwa mafuta otsika kwambiri, kapena chifukwa chomangirira ma bolts amutu ndi mphamvu yolakwika.
Pampu yamafuta sikugwira ntchito
Si zachilendo kuti mpope wamafuta wokha ulephere. Nthawi zambiri, kuyendetsa kwake kumasweka. Ngati giya yoyendetsa pampu yang'ambika ndikuyendetsa, kuthamanga kwamafuta kumatsika kwambiri ndipo chizindikiro chachangu chamafuta chimadziwitsa woyendetsa za izi. Ntchito ina ya galimoto ndi yoletsedwa, chifukwa pamenepa injini idzagwira ntchito kwa nthawi yochepa kwambiri. Kutenthedwa kwa magawo kudzachitika, pamwamba pa ma silinda adzaphwanyidwa, chifukwa chake, injini ikhoza kupanikizana, motero, kukonzanso kwakukulu kapena kusinthidwa kwa injini kudzafunika.
Kuvala kwachilengedwe kwa mpope kumathekanso, momwemonso mphamvu ya mafuta idzatsika pang'onopang'ono. Koma izi ndizovuta kwambiri, chifukwa gwero la mpope wamafuta ndi lalikulu kwambiri ndipo nthawi zambiri limatha mpaka injiniyo itasinthidwa. Ndipo panthawi yokonza, woyang'anira wamkulu ayenera kuyang'ana mkhalidwe wake ndikusintha ngati kuli kofunikira.
Kuvala kwa injini zachilengedwe
Injini yoyaka mkati imakhala ndi chida china, chomwe chimayesedwa ndi mtunda wagalimoto pamakilomita. Aliyense wopanga amalengeza chitsimikizo mtunda wa injini pamaso kukonzanso. Panthawi yogwira ntchito, mbali za injini zimatha ndipo mipata yaukadaulo pakati pazigawo zopaka imawonjezeka. Izi zimatsogolera ku mfundo yakuti mwaye ndi madipoziti omwe amachokera ku chipinda choyaka moto cha masilindala amalowa mumafuta. Nthawi zina mafutawo amalowa m'zipinda zoyatsira mafuta zomwe zawonongeka ndikuwotcha pamenepo pamodzi ndi mafuta. Nthawi zambiri mumatha kuwona momwe chitoliro cha magalimoto akale chimasuta kwambiri ndi utsi wakuda - uku ndikuyaka mafuta. Moyo wautumiki wamafuta mumainjini owonongeka umachepetsedwa kwambiri. Galimoto iyenera kukonzedwa.
Momwe mungawonjezere kuthamanga kwamafuta a injini
Kuti mubwezeretsenso mphamvu yamafuta yomwe mukufuna mu injini, ndikofunikira kuchotsa zomwe zimayambitsa kuchepa kwake - kuwonjezera kapena kusintha mafuta, kukonza pampu yamafuta kapena m'malo mwa gasket pansi pamutu wa silinda. Pambuyo pa zizindikiro zoyamba za kuchepa kwa kuthamanga, muyenera kulankhulana ndi mbuye mwamsanga kuti mudziwe zolondola. Zizindikiro izi zitha kukhala:
- kutenthedwa kwa injini kapena ntchito yosakhazikika;
- kutaya mphamvu;
- kutulutsa mafuta mu injini;
- utsi wamphamvu kuchokera ku chitoliro chotulutsa chamtundu wa imvi, woyera kapena wakuda;
- ntchito kapena kuwunikira kwa chizindikiro chadzidzidzi cha kuthamanga kwa mafuta.
Chifukwa cha kutsika kwa kupanikizika kungakhale kovuta kwambiri, kapena m'malo mwake, osati otsika mtengo. Tikulankhula za kuvala kwa injini panthawi yogwira ntchito. Pamene yadutsa kale gwero lake ndipo ikufunika kukonza, mwatsoka, kupatulapo kukonzanso kwakukulu, sikungatheke kuthetsa vutoli ndi kutsika kwa mafuta mu injini. Koma mutha kusamala pasadakhale kuti kuthamanga kwamafuta mu injini yomwe yatha kale kumakhalabe kwabwinobwino. Masiku ano, pali zowonjezera zingapo pamsika wamafuta amagalimoto opangidwa kuti athetse kuvala pang'ono kwa injini ndikubwezeretsa mipata yaukadaulo wamafakitale pakati pa magawo opaka.
Zomwe zimagwiritsidwa ntchito kuti muwonjezere kuthamanga kwa mafuta
Zowonjezera injini zimapezeka m'mitundu yosiyanasiyana:
- kubwezeretsa - zomwe zimatchedwa zitsulo zopangira zitsulo, zomwe zimapangidwira kuti zibwezeretse malo owonongeka a kupaka zigawo ndikuchotsa ma microcracks. Iwo amapanga wosanjikiza zoteteza padziko injini mbali;
- kupulumutsa mafuta - kusunga mafuta;
- kukhazikika - kukonzedwa kuti abwezeretse mamasukidwe akayendedwe a mafuta pa kutentha kwakukulu ndikuwongolera phukusi lowonjezera mumafuta, ngati likugwiritsidwa ntchito mu injini pa katundu wambiri;
- zotsukira - kuthandiza kuchotsa madipoziti olimba ndi mwaye.
Kuonjezera kupanikizika, kubwezeretsa ndi kukhazikika zowonjezera ziyenera kugwiritsidwa ntchito. Ngati injiniyo siivala molakwika, ithandiza. Inde, simuyenera kuyembekezera chozizwitsa, zowonjezera zimakweza kupanikizika pang'ono ndipo zotsatira zake zimadalira kwambiri kuvala kwa injini.
Galimoto yatsopano sikusowa zowonjezera, zonse ziri mu dongosolo mmenemo. Ndipo kuti asakhale othandiza m'tsogolomu, muyenera kusintha mafuta munthawi yake ndikugwiritsa ntchito zinthu zapamwamba zokha zomwe zili ndi phukusi lazowonjezera zomwe zimakhudza magwiridwe antchito agalimoto. Izi ndizokwera mtengo, koma zothandiza, chifukwa zimangokhudza injini yagalimoto yanu. Pali mikangano yambiri komanso malingaliro osiyanasiyana okhudzana ndi kugwiritsa ntchito zowonjezera - wina amanena kuti amathandiza, ena amanena kuti izi ndi chinyengo komanso malonda. Chisankho choyenera kwa eni galimoto yatsopano chidzakhala ntchito yosamala ndi kukonzanso pambuyo pa kutha kwa moyo wa injini.
Momwe mungayesere kuthamanga kwamafuta a injini
Magalimoto ena amakhala ndi geji yokhazikika yomwe imawonetsa kuthamanga kwamafuta pagawo la zida. Popanda zotere, ndikofunikira kugwiritsa ntchito choyezera chapadera. Pofuna kuyeza kuthamanga kwa mafuta, ndikofunikira kuchita zotsatirazi.
- Yatsani injini kutentha kwa 86-92 ° C.
- Imani injini.
- Chotsani chosinthira chachangu chamafuta kuchokera pagawo la injini.
- Ikani payipi ya pressure gauge pogwiritsa ntchito adapter m'malo mwa sensor yamafuta.
- Yambitsani injini ndipo osagwira ntchito yesani kuthamanga kwamafuta.
- Posintha liwiro la crankshaft kukhala lapakati komanso lalitali, lembani kuwerengera kwamphamvu pagawo lililonse.
Kuthamanga kwa mafuta kumasiyanasiyana mu injini zamitundu yosiyanasiyana, kotero kusiyanasiyana kwa ntchito yake kuyenera kufunidwa m'mabuku aukadaulo amtundu wina wamagalimoto. Koma ngati izi sizili pafupi, mutha kugwiritsa ntchito deta yofananira ndi momwe ma injini amagwirira ntchito.
Table: pafupifupi kuthamanga kwamafuta mumainjini omwe angagwiritsidwe ntchito
Njinga khalidwe | Zizindikiro |
1,6L ndi 2,0L injini | 2 atm. pa XX Revolutions (liwiro lopanda ntchito), 2,7-4,5 atm. pa 2000 rpm mu min. |
1,8 l injini | 1,3 pa. pa XX Revolutions, 3,5-4,5 atm. pa 2000 rpm mu min. |
3,0 l injini | 1,8 pa. pa XX Revolutions, 4,0 pa. pa 2000 rpm mu min. |
4,2 l injini | 2 pa. pa XX Revolutions, 3,5 pa. pa 2000 rpm mu min. |
Injini za TDI 1,9 l ndi 2,5 l | 0,8 pa. pa XX Revolutions, 2,0 pa. pa 2000 rpm mu min. |
Chifukwa chake, ngati zizindikirozo zikupitilira zomwe zaperekedwa patebulo, ndiye kuti muyenera kulumikizana ndi katswiri kapena kuchitapo kanthu kuti muthetse vutolo nokha.
Asanayambe kukonza, mphamvu ya mafuta iyenera kuyezedwa kuti zitsimikizire kuti zizindikiro zoyambirira zinali zolondola.
Video: kuyeza kuthamanga kwamafuta mu injini yamagalimoto
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Mafuta a galimoto angayerekezedwe ndi magazi m'thupi lamoyo - amagwira ntchito yofunika kwambiri pakugwira ntchito kwa ziwalo zonse, monga momwe mafuta amagwirira ntchito mu injini ya galimoto. Yang'anirani mosamala momwe mafuta alili mu injini, yang'anani kuchuluka kwake pafupipafupi, kuyang'anira zonyansa za tchipisi, kuwongolera mtunda wagalimoto, kudzaza mafuta kuchokera kwa wopanga wodalirika ndipo simudzakumana ndi mavuto ndi kuthamanga kwamafuta mu injini.