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1、康明斯发动机常见故障诊断及排除TroubleshootingandtroubleshootingofCumminsEngine2009-5-12DiagnosisandtreatmentofidlespeedofengineWhentheengineisidle,thethrottlewillstal1.Whenthethrottleisslightlylarger,thespeedwillriserapidly,anditcannotrunstablyatlowspeed・ThereasonThegovernoridle
2、springistoosoftorbroken.Thespeedsensorcomponentsweartoomuch・Thepistonoffuelinjectionpumpisseriouslyworn.Thetemperatureistoolow.Cylinderpressureistoolow.ThediagnosisandtreatmentmethodsThereisnoidlespeedduringcoldstarting,whichisanormalphenomenon.Thisisbecausethetem
3、peratureistoo1ow,theoilviscosityistoolarge,sothattheengineinternalresistanceincreases,sprayandevaporationvariationcausedbydieselengine,cannotmaintaintheminimumstablespeed,whentheacceleratorisliftedsoonstalled.Inthiscase,thethrottlecdnbeadjustedslightlyhigherthanth
4、eidlespeed・Aftertheengineisheatedup,theidlerunningwillberesumed・Iftheenginehasbeenforalongtime,noidlecondition,andaccompaniedbyalackofpower,fuelconsumptionisnotnormal,becausetheplungerweartoomuchidle,leakageofoilincreased,theoilsupplycannotmeettherequirementsofidl
5、econdition;orthecylinderpressureistoolow,thefuelinjectionadvanceangleistoolarge,toosmall,sothattheenginecombustionconditionscausedbypoorthe・Aslongasthefailuretodealwiththepowerfailure,theidleconditionwillberestorednatural1y.Iftheaboveconditionsarenormal,theidlewor
6、kelementsoftheGovernorshallbeconsidered・Checkwhetherthegovernorspringisbrokenorthatthespeedcontrolcomponentsweartoomuchorthespringistoosoft,sothatthecentrifugalforceoftheflyinghammeratidlespeedismuchgreaterthanthespringtensionandtheoilisreduced,orthemaintenanceper
7、sonnelisimproperlyadjusted・Thefuelinjectionpumpassemblymustberemovedandreadjustedonthetestbench・Whencheckingthegovernor,itshouldbeadjustedbyidlescrewfirst.Iftheadjustmentisinvalid,thenthetensionoftheidlespringisadjusted・Theidlespringadjustingnutcanbescrewedslightl
8、yinside,orashimisaddedonthespringseat,sothatthepretighteningforceisincreased,andtheidlespeedisincreased・Ifthespringisbroken,itshouldbereplacedandadjuste
