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1、康明斯柴油发动机维修保养注意事项Cummingsdieselenginerepairandmaintenancemattersneedingattention 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
2、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。ChinesebusmanufacturersrecentlyusingCummingsseriesdieselengineismoreandmore,suchastheYangtzeRiverinChangzhoucitybusassemblyB2230CNdoubleGengine;EQ5061XXYKvanvansfittedwiththe4BT319AAEQ6890LKluxurypassengercare
3、ngine;engineusing6BTA;EQ6590(2000),EQ6690(2000)busalsouse4BT319AAsuperchargedengine.Practiceshowsthat,Cumminsengineinbusdrivingpower,fueleconomy,reliableuse,lowemissionpollution.AsanextensionofCummingstheservicelifeofdieselengines,the6BTseriesmodelasanexample,int
4、roducesseveralrepairpointsforattentionandthemethodsoffaultdiagnosisforpassengercarsarerepaired,reference. 1、维修注意事项1,repairthemattersneedingattention (1)6BT118机型镶装缸套(1)6BT118typeinsertingcylinder 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
5、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φ101.97mm(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φ107.95mm(留0.02~0.03mm
6、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。Themanufacturerisnotinthemachineinsertliner,butallowsthecylinderwearexceedsthelimitafterinsertingspecialcylinder.IcompanyforcylinderlinerandtheMuping102seriescylinderhavebeenembeddedtest.Ins
7、ertspecialcylinder,thecylinderbearingholeboringtoφ104.94mm,andensurethebearingboreandcylinderinterferenceamountwas0.05~0.07mm.Attentioninthebearingholeoflowerpartof7~8mmhighport,andthenin-20°Cundertheconditionsofcoolingover1hcylindergluingandpressintothebearingho
8、le,finallyresectedcylinderupperhighcylinderpart,thecylindersleeveinnerholeboringtoφ101.97mm(with0102~0.03mm),quantityofthehoninghoningsurfaceroughnessisRa0.4Lm