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1、康明斯柴油发动机维修保养注意事项Cummings diesel engine repair and maintenance matters needing attention我国客车制造商近期采用康明斯系列柴油机型越来越多，如常州长江双层城市客车装配B2230CN G 发动机；EQ 5061 XXYK 厢式客货两用车装用4BT 319AA 发动机；EQ 6890L K 豪华客车选用6BTA 发动机；EQ 6590 ( 2000 款)、EQ 6690 ( 2000款) 客车也选用4BT 319AA 增压发动机。实践表明，康明斯发动机在客车上动力强劲，经济省油，使用可靠，排放污染低。为延长康明斯柴
2、油机的使用寿命，以6BT 系列机型为例，介绍几点维修注意事项及故障诊断方法，供修理时参考。Chinese bus manufacturers recently using Cummings series diesel engine is more and more, such as the Yangtze River in Changzhou city bus assembly B2230CN double G engine; EQ 5061XXYK van vans fitted with the 4BT319AA EQ6890L K luxury passenger car engine;
3、 engine using6BTA; EQ 6590(2000), EQ 6690(2000) bus also use4BT319AA supercharged engine. Practice shows that, Cummins engine in bus driving power, fuel economy, reliable use, low emission pollution. As an extension of Cummings the service life of diesel engines, the6BT series model as an example, i
4、ntroduces several repair points for attention and the methods of fault diagnosis for passenger cars are repaired, reference.、维修注意事项1, repair the matters needing attention（）6BT118 机型镶装缸套(1)6BT118type inserting cylinder制造商未在该机上镶装缸套，但允许在气缸磨损量超过使用极限后镶装专用缸套。我公司对专用缸套和牟平102 系列缸套都进行了镶装试验。镶专用缸套时，先将缸套承孔镗至104.
5、 94 mm ，并保证承孔与缸套的过盈量为0.05 0. 07 mm。注意在承孔下部留7 8 mm 高的止口，再将已在- 20C 条件下冷却1 h 以上的缸套涂胶并压入承孔，最后切除缸套上端高出缸体上平面的部分，将缸套内孔镗至101. 97 mm (留0102 0. 03 mm 的珩磨量) ，使珩磨表面粗糙度为Ra0. 4 Lm，保证缸套与活塞之间的间隙符合规定。镶牟平102 系列缸套时，先将缸套承孔上部加工出112. 05mm、深10 mm 的台阶(俗称上止口) ，再将缸套承孔镗至约107.95 mm (留0.02 0. 03 mm 的珩磨量)，然后珩磨，使承孔表面粗糙度为Ra0.4Lm，并
6、保证承孔与缸套的过盈量为0.02 0. 03mm。最后将缸套外圆表面涂少量机油，压入承孔。The manufacturer is not in the machine insert liner, but allows the cylinder wear exceeds the limit after inserting special cylinder. I company for cylinder liner and the Muping 102 series cylinder have been embedded test. Insert special cylinder, the cyl
7、inder bearing hole boring to 104.94 mm, and ensure the bearing bore and cylinder interference amount was 0.05 0.07 mm. Attention in the bearing hole of lower part of7 8 mm high port, and then in - 20 C under the conditions of cooling over 1 h cylinder gluing and press into the bearing hole, finally
8、resected cylinder upper high cylinder part, the cylinder sleeve inner hole boring to 101.97 mm (with0102 0.03mm ), quantity of the honing honing surface roughness is Ra0.4 Lm, ensure that the clearance between the cylinder liner and piston in accordance with the provisions. With Muping102 series cyl
9、inder, the cylinder bearing hole of upper processing of 11205mm,10mm level ( commonly known as the upper stop ), then the cylinder bearing hole boring to 107.95mm (with0.02 0.03 mm honing volume ), and then make the bearing hole honing, surface roughness of Ra0.4Lm, and to ensure the bearing bore an
10、d cylinder interference amount was 0.02 0 03mm. The liner outer surface apply a small amount of oil, pressed into a bearing hole.通过这两种缸套镶装试验，总结如下：The two cylinder is inlaid with the test, summarized as follows:、使用牟平102 系列缸套装机可以大大缩短修理时间。因为该缸套的内孔面为成品面，不需镗、磨及在镗缸机上装夹缸体、定中心而费力费时；其次缸套在压入承孔前不需冷处理。但用专用缸套装机，
11、每次修理时需镗旧缸套次、珩磨1 次、缸体装夹2次和定中心次，还要冷处理缸套。A, using the Muping102 series cylinder set machine can greatly shorten the repair time. Because the cylinder bore surface of finished surface, need not be boring, milling and in the cylinder boring machine with the clamping cylinder, centering and laborious and
12、time-consuming; the second cylinder in press in the bearing hole of no need of cold processing. But with a special cylinder set machine repair, every time when boring old cylinder jacket2 times,1 times, honing cylinder clamping2 and center2, and cold treatment of cylinder liner.、使用牟平102 系列缸套装机，维修质量容
13、易保证。因为缸体在珩磨机上经过多次装夹和定中心后，会因定位误差积累而超差，增加了维修质量难度，尤其是用移动式镗缸机产生的误差更大。而使用牟平102 系列缸套，只要第1 次承孔镗磨质量符合技术要求，以后可以像五十铃载货车发动机一样直接压入、压出缸套，而且组装上活塞连杆后工作时不会产生偏缸。B, using the Muping102 series cylinder set machine repair, easy quality assurance. Because of in cylinder honing machine after repeated clamping and centeri
14、ng, due to positioning error accumulation and tolerance, increased the difficulty of repair quality, especially the mobile cylinder boring machine error is greater. While the use of Muping 102 series cylinder, as long as the first bearing hole boring mill quality can meet the technical requirements,
15、 can later be like Isuzu truck engine directly pressed into the cylinder, press, and assembly piston rod after work will be generated when the partial cylinder.（）6BT519 机型的止推轴瓦(2)6BT519type thrust bearing安装在6BT 519 型柴油机第6 道主轴承座的国产固定式翻边止推轴瓦，其上的止推片与主轴瓦为刚性连接。这种连接的面积比较小，且连接处的应力比较集中，所以止推片在曲轴的频繁冲击下可能会断裂而掉
16、落。而进口的组合式翻边止推轴瓦，其上的止推片与主轴瓦采用燕尾槽连接，允许止推片作微量的摆动，以弥补曲轴及主轴承座止推面对曲轴轴线的垂直度误差，保证止推片对曲轴止推面良好配合。因此，在柴油机大修时将固定翻边止推轴瓦更换为组合式翻边止推轴瓦，且控制轴向间隙在标准范围内，不会再出现该座孔严重磨损、止推片掉到油底壳的现象。对该座孔已严重磨损的两个侧面可以采用氧乙炔火焰喷涂法修复。Installed in the 6BT type 519diesel engine main bearing seat sixth domestic fixed flanged thrust bushing, the thrust plate and the main bearing as rigid connection. The connecting area is relatively small, and the connecting posi
