bap technical resources diesel parts 201232 glowplugtechgd08
TRANSCRIPT
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Technical and Sales Information
Diesel Glow Plugs
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page 2
Technical and Sales Information
Bosch Glow Plugs
This booklet is intended for your use as a sales and technical training reference. It answers the questions
most commonly asked by:
Automotivepartssalesprofessionals
Automotivepartsserviceprofessionals
DIY(do-it-yourself)customers
DIFM(do-it-for-me)customers
Pleasereviewthequestionsandanswersonthepagesthatfollowtofamiliarizeyourselfwiththefeaturesand
benetsofBoschGlowPlugs.Yourcustomersdependonyoutoprovidecompleteandaccurateproduct
informationsotheycanmakeaninformedchoice.Armedwiththeanswerstothesequestions,youcaneasily
conveytoyourcustomersthemanybenetsofstockingorpurchasingBosch.Oncetheyhaveallthefacts,it
willbeclearthatforpremiumqualityglowplugs,builttodeliversuperiorcold-startperformance,Boschisthe
bestchoice.
Question Answer
1. Whydodieselenginesrequireglowplugsandwhatfunctiondotheyperform?. . . . . . . . . . . page 3
2. WhatsetsBoschGlowPlugsapartfromotherbrands?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4
3. WhatisBoschDuratermtechnologyandhowisitdifferent
fromotherglowplugtechnologies?.............................................page 5
4. Whatcausesglowplugfailureandwhataretheresults? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6
5. Whatconditionsindicatethatitstimetoreplacetheglowplugs? . . . . . . . . . . . . . . . . . . . . . page 7
6. Canonlythewornorfailedglowplug(s)bereplaced,orshould
allglowplugsbereplacedatthesametime? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7
7. BoschisnottheOEglowplugonthisvehicle.
IsBoschcomparabletotheOEbrand? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7
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page 3
Direct-injection engine Pre-chamber engine
1Nozzleholderwithinjectionnozzle 1Nozzleholderwithinjectionnozzle2Sheathed-elementglowplug 2Sheathed-elementglowplug
3Combustionchamber 3Pre-chamber
4Combustionchamber
Technical and Sales Information
Bosch Glow Plugs
Question 1
Whydodieselenginesrequireglowplugsandwhatfunctiondotheyperform?
Answer
Unlikegasolineengineswhichuseasparkplugtoigniteanair/fuelmixture,dieselenginesrelyontheheatof
highly-compressedairtoigniteapreciseamountoffueltoinitiatecombustion.Heatingtheairtoaminimumstartingtemperatureof850Ciscriticalfordieselenginestart-up.
Inlowtemperatures,factorssuchascoldintakeairandcoldcylinderwallshindertheattainmentofthe
necessarystartingtemperature.Inthesesituations,glowplugsfunctionasanadditionalheatsourcetobring
theintakeairuptothetemperaturenecessarytoinitiatethecombustioncycle.
Therearetwobasictypesofdieselcombustioncycles:
Nomatterwhichtypeofdieselengineavehiclehas,Boschsuppliesjusttherightglowplugtogiveyour
customersdependablecold-startperformance.
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page 4
RegulatingCoil
TwinVitonSealsGlowTubeMaterial
(Inconel601)
ConnectorDesigned
toOESpecs
HeatingCoil
Fine-Grained
CeramicPowder
BoschPatented
DuratermTechnology
Technical and Sales Information
Bosch Glow Plugs
Question 2
WhatsetsBoschGlowPlugsapartfromotherbrands?
Answer
Bosch,aworldwideleaderindieselfuelinjectioninnovationengineersandmanufacturesglowplugsto
withstandtherigorousdemandsoftodaysdieselengines.
Feature Benefit
BoschpatentedDuratermtechnology* Reacheshighertemperaturemorequicklyforfast
enginestart-up
Inconel601glowtubematerial Resistscorrosionandvibrationforlongservicelife
Fine-grainedceramicinsulatingpowder Providessuperiorelectricalinsulationandhigh
thermalconductivity
TwinVitonseals Protectcoilsfromexhaustgasdamageforlonglife
ConnectorsdesignedtoOEspecications Deliverprecisetandeasyinstallation
VitonisaregisteredtrademarkofDuPontDowElastomersLLC.InconelisaregisteredtrademarkofIncoAlloysInternational,Inc.
*Availableforthemajorityofdieselcarandlighttruckapplications.Otherapplicationsemploystandardglowplugtechnology
perOEspecications.
Thepost-glowfeatureallowstheglowplugtoremainactiveforuptothreeminutesafterthevehiclehasstarted.
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page 5
Technical and Sales Information
Bosch Glow Plugs
Question 3
WhatisBoschDuratermtechnologyandhowisitdifferentfromotherglowplugtechnologies?
Answer
BoschsrevolutionaryDuratermglowplugtechnologyutilizesaself-regulatingcontrolsystemthatreduces
glowwaittimebymorethan50%.Thepatenteddual-controlregulatingandheatingcoileffectivelydirectscurrentdraw,enablingtheglowplugtoreachhighertemperaturesmorequicklyforfasterenginestart-up.The
regulatingcoilkeepstheheatingelementwithinthe10001100Coptimaltemperaturerange,preventing
enginedamageduetoovervoltage/overheating(seeQuestion4).
Forvehicleswithapost-glowcontrolsystem,thisadvancedtechnologyoffersapost-glowheatingphase.
Duringthepost-glowphase,glowplugscontinuetooperateforuptothreeminutesaftertheenginehasstarted,
improvingoverallengineperformanceandreducingsmokeemissionsandcombustionnoise.
BoschDuratermtechnologyisavailableforthemajorityofdieselcarandlighttruckapplications.Other
applicationsemploystandardglowplugtechnologyperOEspecications.
Heating phase comparison
Standard glow plug technology vs. Bosch Duraterm
(StandardrepresentsaverageofBoschandleadingcompetitors.)
TempC
1200
1100
1000
900
800
700
600 Standard Duraterm
0 10 20 30 40 50 60
Time(seconds)
starti
ng
minimumstarttemperature(850C)
startin
g
pre
-heat
pre
-hea
t
post-glow
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page 6
Technical and Sales Information
Bosch Glow Plugs
Question 4
Whatcausesglowplugfailureandwhataretheresults?
Answer
Excessive voltage is the leading cause of glow plug failure.
Glowplugsaredesignedtooperatewithinatemperaturerangeof8501100C.Duringoperation,theglow
plugcontrollerswitchescurrenttotheglowplugforaspecicperiodoftimetoallowforproperheating.
However,whenthecontrollerfails,currentcouldbeappliedforalongerthanspeciedtimecausingthe
temperatureoftheglowplugtoexceedthe1100Cupperlimit.Undertheseconditions,theglowplugoverheats
causingthecasingtoswell,splitorburstwhichallowsairtoenterthecoilareacausingimmediatefailure.
Other causes of glow plug failure include:
Impropertestingprocedure(applying12voltsdirectlytoaglowplugdesignedtooperateon6volts)
Incorrectenginetiming
Improperfuelinjectorspraypattern
Continualcyclingoftheglowplugs
GlowPlugsdamagedduetoovervoltage GlowPlugdamagedbyincorrect
enginetiming
Damagelikethiswillmostlikelyresultinenginefailure.Removingaglowplugwithadistendedorbrokentip
mayrequireengineheadremovalatime-consumingandcostlyrepair.
Heedthewarningsignsofwornglowplugs(seeQuestion5)andreplacethemwithabrandnewsetofBosch
GlowPlugs!
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page 7
Technical and Sales Information
Bosch Glow Plugs
Question 5
Whatconditionsindicatethatitstimetoreplacetheglowplugs?
Answer
Thefollowingsignsmostlikelyindicatethatitstimetochangeavehiclesglowplugs.Ifanyoftheseconditions
exist,besuretocheckthevehiclesglowplugsandifnecessary,replacethemwithanewsetofBoschGlowPlugs.
Vehiclewontstart
Vehiclestartsonlyafterexcessivecranking
Excessivecrankingcancausetheengineoiltobedilutedwithfuel,whichcouldadverselyeffectthelife
oftheengine.
Vehicleidlesroughlyafterinitialstart-up
Excessiveexhaustemissionsafterinitialstart-up
Question 6
Canonlythewornorfailedglowplug(s)bereplaced,orshouldallglowplugsbereplacedatthesametime?
Answer
Ifoneglowplugfails,chancesaretheotherswontbefarbehind.Tominimizevehicledown-timeandsaveon
laborcosts,Boschrecommendschangingallglowplugsatthesametime.
Question 7
BoschisnottheOEglowplugonthisvehicle.IsBoschcomparabletotheOEbrand?
Answer
YoucanreplaceOEglowplugswithBoschwithcompletecondence.BoschiscurrentlytheOEglowplugonmostEuropeandieselvehicleapplications.AndforDomesticandJapanesevehicleapplications,BoschGlow
Plugsaredesignedtomeetand/orexceedtheOEglowplugspecications.
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Robert Bosch LLC
Broadview,Illinois60155
Robert Bosch, Inc.
Mississauga,OntarioL5N1R1
www.boschautoparts.com
www.bosch.ca
BOSCH is a trademark licensed by Robert Bosch GmbH |and/or its affiliated entities.
2008 Robert Bosch LLC, USA. All rights reserved.
Printed in USA
Make Bosch Glow Plugs a part of everydiesel tune-up.
Regularpreventivemaintenancekeepsadiesel
vehiclerunningrightandcansavetheownerthe
costandinconvenienceofunexpectedrepairsdowntheroad.Whenyouresellingatune-up,
besuretosuggestanewsetofBoschGlowPlugs
forbothimportanddomesticdieselcarsand
lighttrucks.
Since1927,Boschhasbeenrecognizedasa
worldwideleaderindieselinnovation.AllBosch
GlowPlugsaredesignedandmanufacturedto
meetorexceedOEmanufacturerspecications.
Boschexperienceandhighqualitystandardsare
yourassuranceofpremiumperformanceand
customersatisfaction.
Dontleaveyourcustomersoutinthecold.Sell
BoschGlowPlugs.
Bosch Diesel Glow Plugs
20123207/08