誤區(qū)1、亂涂黃油

Misunderstanding 1. Scribble butter

攪拌車打黃油主要是起一個潤滑的作用,一般攪拌車旋轉(zhuǎn)、 嚙合等地方都需要黃油。有些維修工會在汽缸墊上也打上黃油,借此增強(qiáng)發(fā)動機(jī)的密封性。這種做法是錯誤的。氣缸螺栓擰緊后,一部分 黃油不可避免地會流入氣缸,外面殘余的黃油在高溫下還會在缸墊、缸蓋與機(jī)體平面之間形成縫隙,反而降低密封性。

The mixing truck is mainly used for lubrication. Generally, the mixing truck needs butter in rotation, meshing and other places. Some maintenance unions also put butter on the cylinder gasket to enhance the tightness of the engine. This is wrong. After the cylinder bolts are tightened, part of the butter will inevitably flow into the cylinder, and the residual butter outside will form a gap between the cylinder gasket, cylinder head and the plane of the engine body at high temperature, which will reduce the tightness.

誤區(qū)2、長時間不換機(jī)油

Misunderstanding 2. Do not change the oil for a long time

更換機(jī)油是許多司機(jī)容易忽視的點(diǎn)。如果長期只是一昧地添加機(jī)油, 發(fā)動機(jī)的許多零部件會缺少潤滑,長此以往磨損加劇。柴油機(jī)在運(yùn)轉(zhuǎn)的過程中也會吸附很多雜質(zhì)進(jìn)入機(jī)油,如果長期不更換機(jī)油,可能導(dǎo)致燒瓦、抱軸等問題。

Changing engine oil is a point that many drivers easily ignore. If you only add oil for a long time, many parts of the engine will lack lubrication and wear will increase in the long run. During the operation of the diesel engine, many impurities will be absorbed into the engine oil. If the engine oil is not changed for a long time, it may lead to problems such as Bush burning and shaft holding.

誤區(qū)3、明火加溫活塞

Misunderstanding 3. Open fire heating piston

有經(jīng)驗的維修工都知道,在安裝活塞銷之前,要先讓活塞受熱膨脹。一些人為了省事， 直接用明火對活塞進(jìn)行加熱。這種方式會讓活塞受熱不均產(chǎn)生變形,正確做法是講活塞放入熱油中均勻受熱。

Experienced repairmen know that before installing the piston pin, let the piston expand by heating. In order to save trouble, some people directly heat the piston with an open fire. In this way, the piston will be deformed due to uneven heating. The correct way is to put the piston into hot oil and heat it evenly.

誤區(qū)4、使用砂布打磨軸瓦

4. Polish the bearing bush with emery cloth

刮瓦技術(shù)難度較大,缺乏經(jīng)驗的維修工難以掌握,為此,有人在更換軸瓦時,為了增大軸瓦與曲軸的接觸面積,就用砂布打磨代替刮瓦。這種方法會使砂布上較硬的顆粒嵌入軸瓦合金,柴油機(jī)運(yùn)轉(zhuǎn)過程中加速軸頸的磨損,縮短曲軸的使用壽命。

It is difficult for inexperienced maintenance workers to master the scraping technology. Therefore, when replacing the bearing bush, someone polished it with emery cloth instead of scraping it in order to increase the contact area between the bearing bush and the crankshaft. This method will make the hard particles on the abrasive cloth embedded in the bearing bush alloy, accelerate the wear of the journal and shorten the service life of the crankshaft during the operation of the diesel engine.