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康明斯柴油发动机维修保养注意事项

1、维修注意事项
1, repairthemattersnee镶装缸套
(1)6BT118typeinserting 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φ104.94mm ,并保证承孔与缸套的过盈量为0.05~ 0.07mm。注意在承孔下部留7~8mm高的止口,再将已在-20°C条件下冷却1h 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φ101.97 mm (留0102~0. 03mm的珩磨量),使珩磨表面粗糙度为Ra0.4Lm,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φ112.05mm、深10mm的台阶(俗称上止口),再将缸套承孔镗至约φ107.95 mm (留0.02~ 0. 03mm的珩磨量),然后珩磨,使承孔表面粗糙度为Ra0.4Lm,并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。
ChinesebusmanufacturersrecentlyusingCummingsseries diesel engineismore andmore, suchastheYangtzeRiverin Changzhou citybusassembly B2230CN double G engine; EQ5061XXYK vanvans fitted withthe4BT319AAEQ6890L K luxury passenger carengine;engine using6BTA; EQ 6590(2000), EQ6690(2000)busalso use4BT319AAsuperchargedengine. Practiceshowsthat,Cumminsenginein busdrivingpower,fuel economy,reliable use, low emissionpollution. AsanextensionofCummingstheservicelife ofdieselengines,the6BTseries modelas anexample,introduces severalrepair pointsforattentionandthemethodsoffault diagnosisforpassengercarsarerepaired,reference.
The manufacturerisnot inthemachineinsertliner, but allowsthecylinderwearexceedsthelimitafter inserting specialcylinder. I company forcylinder linerand theMuping 102seriescylinder havebeen embeddedtest.Insert specialcylinder,thecylinderbearingholeboringto φ104.94mm,andensurethe bearingboreandcylinderinterference amount was0.05~0.07 mm.Attention in thebearingholeoflower part of7~ 8 mm highport, and thenin-20°Cunderthe conditions of coolingover1 h cylindergluingandpress intothebearing hole,finallyresected cylinder upperhighcylinder part,the cylindersleeve innerhole boringtoφ101.97mm(with0102~0.03mm),quantityof the honing honingsurfaceroughnessisRa0.4Lm, ensure that the clearancebetweenthecylinderliner andpiston in accordance withtheprovisions.With Muping102 series cylinder, thecylinderbearingholeofupperprocessingofφ11205mm,10mm level(commonlyknown astheupper stop ),then thecylinderbearinghole boringtoφ 107.95mm (with0.02~0.03 mm honing volume),andthenmakethebearing holehoning,surfaceroughnessofRa0.4Lm, andto ensurethebearing boreandcylinderinterferenceamountwas 0.02~ 0 03mm.Theliner outersurfaceapplyasmallamountofoil, pressedintoabearinghole.
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B2230CNG发动机;EQ5061XXYK厢式客货两用车装用4BT319AA发动机;EQ6890LK豪华客车选用6BTA 发动机;EQ6590(2000款)、EQ6690 ( 2000款)客车也选用4BT319AA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。
康明斯柴油发动机维修保养注意事项
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康明斯柴油发动机维修保养注意事项
Cummingsdieselenginerepairand maintenance matters needingattention
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