TextContentsfuelinjector 噴油器needlevalveassembly 針閥偶件fuelinjectortester 噴油器試驗(yàn)器fuelinjectionpump 噴油泵sealsurface 密封面decompressionzone 減壓環(huán)帶outletvalve 出油閥carbondeposition 積炭

electrodegap 電極間隙short-circuit 短路opencircuit 斷路ground 搭鐵additionalresistance 附加電阻disassemble 拆卸reassemble 重新裝配thermostat 節(jié)溫器TextThispassageisconcernedaboutmaintenanceforfuelsystem,ignitionsystem,lubricatingsystemandcoolingsystem.MaintenanceforthefuelsystemFirstly,let’spayourattentiontotherepairforafuelinjector.Theneedlevalveassemblyoftenwearsduringoperation.Forwithslightwear,millingbyhandisalwaysused.Butforexcessivewearandseriousleak,justreplaceanewone.CheckandadjustmentforthefuelinjectorisshowninFigure36-1.Figure36-1Checkandadjustmentforthefuelinjector1—Fuelinjectortester;2—Adjustingscrew;3—Fuelinjector;4—Forthree-wayunion;5—pumpSecondly,let’sturntorepairforafuelinjectionpump.Itisnecessarytomentiontherepairforoutletvalvecoupleparts.Thewearofoutletvalvecouplepartsmainlyoccursonsealsurfacebetweenvalveandvalveseatordecompressionzoneoftheoutletvalve.Testsareoftenmadetotesttheoutletvalvecoupleparts(Figure36-2).Orsometimeswemayuseeasymethod(Figure36-3).Figure36-2Testfortheoutletvalvecoupleparts1—Outletvalveholder;2—Outletvalve;3—Testingfixture;4—Headscrew

MaintenancefortheignitionsystemInthispart,wewillmainlydealwiththerepairforsparkplug,ignitioncoilanddistributor.Themaindefectofasparkplugiscarbondeposition,crackontheinsulatorandexcessivegapofelectrode.Theusualelectrodegapisabout0.6-0.7mm.WecanusethemethoddisplayedinFigure36-4tocheckandadjustthegap.Themaindefectofignitioncoilisshort-circuit,opencircuitorgroundoftheprimarycoilandsecondarycoil,orshort-circuit,groundorburn-outofadditionalresistance.Thecheckforignitioncoilconsistsof:(1)checkforadditionalresistanceandlowvoltagecoil,(2)checkforhighvoltagecoilandinsideinsulatingproperty.Figure36-3EasymethodFigure36-4MethodtocheckandadjustthegapTheoverhaulofthedistributorincludes:Checkforspringleafelasticofmovingthecontactarmofabreaker(Figure36-5);(2)Checkforthemovingcontact;(3)Checkandadjustmentforthecontactclearance(Figure36-6);(4)Checkandrepairforthedistributorcapanddistributorrotor;(5)Checkforthecapacitor.Figure36-5Checkforthespringleaf

MaintenanceforthelubricatingsystemTheoilpumpsusedonmostenginesarethevolumetypeoilpump.Themainfailureofthiskindofpumpisthepoorsealingperformanceaftersomeparts’wear.Thepoorsealingperformancealwaysleadstolowsupplypressure.Figure36-6Checkandadjustment

Generallyspeaking,wecanrefertothefollowingstodotheoilpumpmaintenance.(Figure36-7)(1)Disassembletheoilpump;(2)Repairtheoilpump;(3)Reassembletheoilpump;(4)Testtheoilpump.Figure36-7Oilpumpmaintenance

Fortheoilfiltermaintenance,wemainlydealwiththemaintenancefortheroughfilterandmaintenancefinefilter.Thefilterelementusedontheroughfilterconsistsofmetalfilterelementandpaperfilterelement.Thepaperfilterelementneedn’trepair.Wecanjustchangeanewoneiftheoldonedoesn’tworkwell.Butthemetalfilterelementneedsrepair.Forthefinefilterwiththepaperfilterelement,onlythehousingandcentraltubeneedscleaning.Itsfilterelementcanbechangedeasily.Maintenanceforthecoolingsystem

Thispartismainlyaboutmaintenanceforthewaterpump,radiatorandthermostat.Thecommoninjuryofthewaterpumpisofleakageorruptureofthepumphousing,bendingorwearofthepumpshaft,damageorcorrosionoftheimpellervaneanddamageoragingofthewasher.Beforewerepairthewaterpump,pleasedocheckitstechnicalstatewiththeenginerunning.Themaindefectsoftheradiatorarein