在裝配發動機時，不論我們有沒有進行裝配標記，一定要能夠保證：活塞處于上止點、配氣氣門完全可以關閉、噴油或點火系統準確分析開始，這三者不能完全發展同步學習才能得到滿足汽車發動機的工作能力要求。修理挖掘機常見的挖掘機結構包括，動力裝置，工作裝置，回轉機構，操縱機構，傳動機構，行走機構和輔助設施等。維修挖掘機第一臺液壓挖掘機由法國波克蘭工廠發明成功。由于液壓技術的應用，20世紀40年代有了在拖拉機上配裝液壓反鏟地懸掛式挖掘機。挖掘機維修最重要(yao)(yao)的(de)三(san)個參數：操(cao)作重量(liang)（質量(liang)），發(fa)動(dong)(dong)(dong)機(ji)功(gong)率和鏟斗斗容。 對直列(lie)式柴油(you)(you)機(ji)，可按轉(zhuan)動(dong)(dong)(dong)控制要(yao)(yao)求學生轉(zhuan)動(dong)(dong)(dong)高壓油(you)(you)泵，以Ⅰ缸(gang)為基準，出油(you)(you)口的(de)出油(you)(you)時(shi)間(jian)順序(xu)(xu)(xu)問題就(jiu)是提(ti)高發(fa)動(dong)(dong)(dong)機(ji)的(de)工(gong)(gong)作內容順序(xu)(xu)(xu)。 發(fa)動(dong)(dong)(dong)機(ji)管理(li)工(gong)(gong)作沒(mei)有(you)順序(xu)(xu)(xu)的(de)判(pan)斷 從拆卸的(de)凸輪(lun)軸上(shang)(shang)(shang)凸輪(lun)組的(de)布置(zhi)來判(pan)斷。首(shou)先研究選取Ⅰ缸(gang)凸輪(lun)組，并結合(he)配(pei)氣機(ji)構在Ⅰ缸(gang)工(gong)(gong)作上(shang)(shang)(shang)止點(dian)時(shi)它所(suo)處(chu)的(de)方向(xiang)(xiang)，觀(guan)察是上(shang)(shang)(shang)八(ba)字(zi)還是下八(ba)字(zi)；其次，按發(fa)動(dong)(dong)(dong)機(ji)的(de)轉(zhuan)動(dong)(dong)(dong)運動(dong)(dong)(dong)方向(xiang)(xiang)基本(ben)要(yao)(yao)求自己轉(zhuan)動(dong)(dong)(dong)凸輪(lun)軸，看哪一組凸輪(lun)組與Ⅰ缸(gang)上(shang)(shang)(shang)止點(dian)時(shi)的(de)凸輪(lun)八(ba)字(zi)方向(xiang)(xiang)保(bao)持一致(zhi)，則那(nei)缸(gang)就(jiu)處(chu)于不(bu)斷壓縮上(shang)(shang)(shang)止點(dian)，依次類(lei)推(tui)。旋轉(zhuan)凸輪(lun)軸一周，發(fa)動(dong)(dong)(dong)機(ji)的(de)工(gong)(gong)作流程順序(xu)(xu)(xu)就(jiu)能做出判(pan)斷出來了。

正時齒(chi)(chi)輪(lun)(lun)(lun)(lun)裝(zhuang)(zhuang)(zhuang)配裝(zhuang)(zhuang)(zhuang)配時，凸(tu)輪(lun)(lun)(lun)(lun)軸(zhou)(zhou)(zhou)(zhou)(zhou)頂(ding)部(bu)類型與(yu)(yu)側型和(he)下(xia)型（近距齒(chi)(chi)輪(lun)(lun)(lun)(lun)傳(chuan)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)和(he)遠距離鏈(lian)或帶(dai)傳(chuan)動(dong)(dong)(dong)(dong)(dong)(dong)(dong))不同）。 但在(zai)任(ren)何(he)一種形式下(xia)，旋(xuan)轉(zhuan)(zhuan)曲(qu)(qu)軸(zhou)(zhou)(zhou)(zhou)(zhou)，將(jiang)I缸(gang)(gang)的(de)(de)(de)活塞放置(zhi)(zhi)在(zai)上(shang)止點(dian)。 其次(ci)，轉(zhuan)(zhuan)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)凸(tu)輪(lun)(lun)(lun)(lun)軸(zhou)(zhou)(zhou)(zhou)(zhou)齒(chi)(chi)輪(lun)(lun)(lun)(lun)使I缸(gang)(gang)凸(tu)輪(lun)(lun)(lun)(lun)設置(zhi)(zhi)在(zai)閥門(men)完全關閉(bi)的(de)(de)(de)位置(zhi)(zhi)，即(ji)上(shang)八字或下(xia)八字保持不變。 三(san)，保證(zheng)供油(you)(you)(you)(you)或點(dian)火的(de)(de)(de)準確(que)(que)性。 對(dui)(dui)于柴油(you)(you)(you)(you)發動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)，可(ke)轉(zhuan)(zhuan)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)高(gao)壓油(you)(you)(you)(you)泵的(de)(de)(de)齒(chi)(chi)輪(lun)(lun)(lun)(lun)，使I缸(gang)(gang)處于準確(que)(que)的(de)(de)(de)供油(you)(you)(you)(you)狀態（新(xin)鮮油(you)(you)(you)(you)）；對(dui)(dui)于汽油(you)(you)(you)(you)發動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)，分(fen)流頭(tou)的(de)(de)(de)相應位置(zhi)(zhi)可(ke)與(yu)(yu)分(fen)流頭(tou)的(de)(de)(de)任(ren)何(he)氣(qi)缸(gang)(gang)出(chu)(chu)口(kou)(kou)位置(zhi)(zhi)對(dui)(dui)齊(qi)，即(ji)I缸(gang)(gang)出(chu)(chu)口(kou)(kou)線。 其他氣(qi)瓶(ping)按(an)工作(zuo)順序插在(zai)頭(tou)蓋出(chu)(chu)口(kou)(kou)線。四，安(an)裝(zhuang)(zhuang)(zhuang)托(tuo)輥輪(lun)(lun)(lun)(lun)或計時鏈(lian)（膠帶(dai)），若總成為(wei)托(tuo)輥輪(lun)(lun)(lun)(lun)，應與(yu)(yu)柴油(you)(you)(you)(you)機(ji)或汽油(you)(you)(you)(you)機(ji)區分(fen)。 對(dui)(dui)于柴油(you)(you)(you)(you)發動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)，應預(yu)留(liu)供油(you)(you)(you)(you)提(ti)前(qian)(qian)角(jiao)，通(tong)常通(tong)過小角(jiao)度(du)旋(xuan)轉(zhuan)(zhuan)曲(qu)(qu)軸(zhou)(zhou)(zhou)(zhou)(zhou)或油(you)(you)(you)(you)泵齒(chi)(chi)輪(lun)(lun)(lun)(lun)（當(dang)此角(jiao)度(du)正確(que)(que)時，托(tuo)輥輪(lun)(lun)(lun)(lun)易(yi)裝(zhuang)(zhuang)(zhuang)入，否則(ze)調(diao)試發動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)時難以(yi)調(diao)整正確(que)(que)的(de)(de)(de)配氣(qi)相位）汽油(you)(you)(you)(you)發動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)，無(wu)需預(yu)留(liu)提(ti)前(qian)(qian)角(jiao)。 如果將(jiang)頂(ding)凸(tu)輪(lun)(lun)(lun)(lun)軸(zhou)(zhou)(zhou)(zhou)(zhou)傳(chuan)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)的(de)(de)(de)鏈(lian)條(tiao)或膠帶(dai)進行裝(zhuang)(zhuang)(zhuang)配，就有一定(ding)的(de)(de)(de)技(ji)巧(qiao)，即(ji)讓(rang)曲(qu)(qu)軸(zhou)(zhou)(zhou)(zhou)(zhou)前(qian)(qian)進一定(ding)的(de)(de)(de)角(jiao)度(du)，使曲(qu)(qu)軸(zhou)(zhou)(zhou)(zhou)(zhou)的(de)(de)(de)位置(zhi)(zhi)恢復到原來的(de)(de)(de)位置(zhi)(zhi)時。 五，書寫新(xin)標(biao)記(ji)(ji)，即(ji)檢查裝(zhuang)(zhuang)(zhuang)配正確(que)(que)后，用細線連接(jie)相交齒(chi)(chi)輪(lun)(lun)(lun)(lun)的(de)(de)(de)軸(zhou)(zhou)(zhou)(zhou)(zhou)心，確(que)(que)定(ding)兩個齒(chi)(chi)輪(lun)(lun)(lun)(lun)的(de)(de)(de)交點(dian)，并標(biao)記(ji)(ji)三(san)個齒(chi)(chi)輪(lun)(lun)(lun)(lun)的(de)(de)(de)交點(dian)；如果是鏈(lian)條(tiao)或皮帶(dai)傳(chuan)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)，用細線連接(jie)主動(dong)(dong)(dong)(dong)(dong)(dong)(dong)和(he)被動(dong)(dong)(dong)(dong)(dong)(dong)(dong)鏈(lian)輪(lun)(lun)(lun)(lun)的(de)(de)(de)中(zhong)心，并標(biao)記(ji)(ji)主動(dong)(dong)(dong)(dong)(dong)(dong)(dong)和(he)被動(dong)(dong)(dong)(dong)(dong)(dong)(dong)鏈(lian)輪(lun)(lun)(lun)(lun)與(yu)(yu)底板對(dui)(dui)應的(de)(de)(de)位置(zhi)(zhi)。 發動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)維修裝(zhuang)(zhuang)(zhuang)配完成后，應調(diao)整氣(qi)門(men)間隙，并檢查供油(you)(you)(you)(you)或點(dian)火正時，確(que)(que)認無(wu)誤后再啟動(dong)(dong)(dong)(dong)(dong)(dong)(dong)調(diao)試，使供油(you)(you)(you)(you)或點(dian)火達到最(zui)佳(jia)調(diao)節(jie)狀態。 一般來說，發動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)的(de)(de)(de)轉(zhuan)(zhuan)向(xiang)(xiang)很容易(yi)理解。 國產發動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)多(duo)為(wei)右旋(xuan)，部(bu)分(fen)為(wei)進口(kou)(kou)發動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)，可(ke)從其風(feng)扇風(feng)向(xiang)(xiang)或起動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)單向(xiang)(xiang)齒(chi)(chi)形轉(zhuan)(zhuan)向(xiang)(xiang)判斷。