三一講解：起重機發動機溫度過高的原因及排除方法

一、發動機溫度過高的原因

1.冷卻係統漏水或冷卻水不足;

2.水溫表指示不準或失靈;

3.冷卻係統水垢太多，散熱效果差;

4.散熱器護罩網或散熱器芯通風道被雜物堵塞
，致使散熱不良;

5.水泵、風扇皮帶過鬆或折斷;

6.水泵損壞，風扇葉片裝反或變形，風圈損壞;

7.節溫器損壞在主閥關閉位置;

8.發動機長期超負荷運轉及供油時間過遲等。

二、發動機溫度過高的排除方法

當發動機在工作中出現水溫過高故障時
，應注意觀察故障現象
，找出原因予以排除。首先要檢查水溫表是否失靈，若不準或失靈應更換;然後檢查水箱是否缺水，進水管
、散(san)熱(re)器(qi)是(shi)否(fou)破(po)裂(lie)漏(lou)水(shui)，除(chu)從(cong)外(wai)部(bu)直(zhi)接(jie)觀(guan)察(cha)外(wai)
，還(hai)可(ke)用(yong)打(da)氣(qi)的(de)方(fang)法(fa)來(lai)檢(jian)查(zha)漏(lou)水(shui)部(bu)位(wei)。散(san)熱(re)器(qi)漏(lou)水(shui)部(bu)位(wei)可(ke)用(yong)錫(xi)焊(han)修(xiu)補(bu)，如(ru)某(mou)根(gen)散(san)熱(re)管(guan)破(po)裂(lie)較(jiao)重(zhong)，可(ke)將(jiang)兩(liang)頭(tou)夾(jia)扁(bian)堵(du)塞(sai)。工(gong)作(zuo)中(zhong)發(fa)現(xian)有(you)輕(qing)微(wei)漏(lou)水(shui)，可(ke)用(yong)肥(fei)皂(zao)堵(du)住(zhu)
，待(dai)停(ting)車(che)後(hou)修(xiu)理(li)。若(ruo)非(fei)上(shang)述(shu)原(yuan)因(yin)，應(ying)進(jin)一(yi)步(bu)檢(jian)查(zha)發(fa)動(dong)機(ji)殼(ke)體(ti)是(shi)否(fou)有(you)裂(lie)紋(wen)，阻(zu)水(shui)圈(quan)是(shi)否(fou)損(sun)壞(huai)，也(ye)要(yao)檢(jian)查(zha)水(shui)泵(beng)泄(xie)水(shui)孔(kong)是(shi)否(fou)漏(lou)水(shui)。最(zui)後(hou)檢(jian)查(zha)散(san)熱(re)器(qi)蓋(gai)的(de)排(pai)氣(qi)閥(fa)是(shi)否(fou)失(shi)效(xiao)，如(ru)失(shi)效(xiao)應(ying)更(geng)換(huan)。

若非冷卻水泄漏問題
，則應分兩種情況對故障進行分析排除。

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