齒軸與齒圈起動機起動時驅動齒輪與發動機飛輪齒圈發出撞擊的空轉聲，其原因有二：變形和間隙過大。

1.變形

由(you)于多缸(gang)發動機熄(xi)火時(shi)往往停轉在壓縮力最大的(de)那個缸(gang)，使(shi)得每次(ci)起(qi)(qi)動時(shi)飛(fei)輪(lun)齒圈受撞擊(ji)的(de)部位大致相同，久之便使(shi)該處齒圈切入(ru)面變(bian)形。遇此情況，可將飛(fei)輪(lun)齒圈轉一個角度(du)或前、后(hou)翻轉后(hou)重新(xin)裝入(ru)，在正常情況下，如果一次(ci)不能起(qi)(qi)動，則必須等齒輪(lun)退回到原來靜止的(de)位置后(hou)，方可作第二(er)次(ci)的(de)起(qi)(qi)動。

2.間隙(xi)過大

齒(chi)(chi)(chi)(chi)(chi)(chi)輪(lun)與齒(chi)(chi)(chi)(chi)(chi)(chi)圈(quan)(quan)(quan)的軸(zhou)向距離應該(gai)保(bao)持(chi)2.5-5毫米。這樣，當主電(dian)路(lu)接通(tong)后(hou)，起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)機(ji)齒(chi)(chi)(chi)(chi)(chi)(chi)輪(lun)與飛輪(lun)齒(chi)(chi)(chi)(chi)(chi)(chi)圈(quan)(quan)(quan)尚(shang)未嚙合(he)即已高速旋(xuan)轉，兩(liang)者(zhe)接觸時自然會因撞擊而發(fa)(fa)出響(xiang)聲，且兩(liang)者(zhe)無法嚙合(he)，發(fa)(fa)動(dong)(dong)(dong)(dong)機(ji)也(ye)就不(bu)(bu)能起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)。遇此故障，可采取將(jiang)起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)機(ji)電(dian)磁開關的靜、動(dong)(dong)(dong)(dong)觸點間(jian)隙調大(da)；在電(dian)磁開關與起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)機(ji)后(hou)殼間(jian)加墊；消除(chu)起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)機(ji)撥叉中部(bu)支(zhi)承銷的多余間(jian)隙；更(geng)換(huan)撥叉上磨損(sun)變小的滑(hua)塊或(huo)滑(hua)輪(lun)；往(wang)飛輪(lun)上裝入齒(chi)(chi)(chi)(chi)(chi)(chi)圈(quan)(quan)(quan)時，勿將(jiang)齒(chi)(chi)(chi)(chi)(chi)(chi)圈(quan)(quan)(quan)壓到飛輪(lun)底(di)部(bu)，留2-3毫米間(jian)隙或(huo)選(xuan)用加厚齒(chi)(chi)(chi)(chi)(chi)(chi)圈(quan)(quan)(quan)等(deng)方(fang)法，予以(yi)排除(chu)。另外，市場上銷售的起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)機(ji)驅動(dong)(dong)(dong)(dong)齒(chi)(chi)(chi)(chi)(chi)(chi)輪(lun)，有(you)的總體(ti)長度不(bu)(bu)符(fu)合(he)標(biao)準，也(ye)有(you)些不(bu)(bu)正(zheng)規廠生產的飛輪(lun)及齒(chi)(chi)(chi)(chi)(chi)(chi)圈(quan)(quan)(quan)高度不(bu)(bu)符(fu)合(he)標(biao)準，都容易造成(cheng)(cheng)這種現象，購買時要格外注意不(bu)(bu)要貪圖便宜而造成(cheng)(cheng)更(geng)大(da)的損(sun)失 。