He aha te mahi a te pūrakau porowhita i roto i te motuka?
Ko te papu wai taraiwa, te whakaputa hiko, te papu hauhautanga, he mea whakarite kia mahi noa te tohanga wai o te miihini kia kore ai e wera, ko te papu wai hei utu i te pākahiko, hei whakarite kia mahi noa ngā ara iahiko waka. Ko te papu hauhautanga he compressor, e whakamahia ana mō te pūnaha hauhautanga.
Ko te kōpae whitiki porowhita te pūtake hiko hei taraiwa i ētahi atu taputapu miihini. Mā te whitiki tuku ka taraiwa i te whakaputa hiko, te papu wai, te papu whakanui, te compressor me ērā atu mea.
I hangaia tuatahitia te pūrei o te porowhita crankshaft hei taraiwa i te porowhita camshaft, ā, ko te whitiki e kīia nei ko te whitiki taima i whakamahia hei hono i a rāua.
Hei mahi matua o te pūnaha taraiwa whitiki wā, ka whakamahia te wira whakakī hei whakatika i te whakakī o te whitiki wā, kia pumau, kia haumaru, kia pono hoki te pūnaha tuku.
He wāhanga nui te whitiki wā o te pūnaha takirere miihini, mā te hononga ki te porowhita me te ōwehenga tuku motuhake hei whakarite i te tika o te wā whakauru me te wā whakaputa. I te wā e rere ana te miihini, ka mau tonu te mahi "tukutahi" i te whiu piston (nekehanga ki runga, ki raro), te whakatuwheratanga me te kati o te takirere (wā), i raro i te hononga "wā".
