bap technical resources diesel parts 201232 glowplugtechgd08

7/29/2019 BAP Technical Resources Diesel Parts 201232 GlowPlugTechGd08

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Technical and Sales Information

Diesel Glow Plugs


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page 2


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


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


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


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


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


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

bap technical resources diesel parts 201232 glowplugtechgd08

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