Delorean DMC-12 1981 Documento tecnico

TECHNICAL

INFORMATION

MANUAL

P.J.GRADYINC(516)589-6224(800)350-7429FAX

(516)589-6241

P.J.GRADYINC(516)589-6224(800)350-7429FAX(516)589-6241

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DELOREANMOTORCOMPANY

TECHNICALINFORMATIONMANUAL

1981DeLorean

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TechnicianName.

Dealership

Name.

InstructorName_

Date

PRINTED3-81

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FOREWORD

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This

servicepublicationhasbeenpreparedbytheServiceTrainingDepartmentof

DeLoreanMotorCompanytoassistinunderstandingthedesignconceptsandthe

generaloperationoftheDeLorean.Itisintendedprimarilyfortheexperiencedand

qualifiedautomotivetechnicianswhohavebeenselectedtoservicetheDeLorean.

Thispublicationincludesthegeneraldescriptionandoperationofvehiclesystems

usedonthisvehiclewhichtheselectedtechniciansarebasicallyfamiliarwithaswell

asthemorespecificallydetaileddescriptionsandoperationforthesystemswhich

maybeuniquetothisvehicleand/ortheservicetechnician.

Allinformation,specificationsandillustrationsinthispublicationarebasedonthe

latestproductinformationavailableatthetimeofprinting.DeLoreanMotorCompany

reservestherighttomakechangesorrevisionsatanytimewithoutnotice.However,it

istheobjectiveofDMCandtheServiceTrainingDepartmenttoprovidetheDMCserv-

icetechnicianwithasmuchaccurateandusableserviceinformationasisavailable,

asquicklyaspossible,inordertosustaina highqualityservicestandard.

IMPORTANT:

TheDeLoreancontainsmanypartsdimensionedinthemetricsystem.Duringany

serviceprocedure,replacementfastenersmust

have

thesamemeasurementsand

strengtnasthosefastenersremoved,eithermetricorcustomary.Thenumbersonthe

headsofmetricboltsandonthesurfacesofmetricnutsindicatetheirstrength.Cus-

tomaryboltsuseradiallinesontheirheadsforstrengthindicatorswhilemostcustom-

arynutsdonothavestrengthindicators.Mismatchedorincorrectfastenerscanresult

invehicledamageormalfunction,orpossiblypersonalinjury.Fastenersremoved

fromthevehicleshouldbereusedinthesamelocationswheneverpossibleexcept

whenindicatedotherwise.Whenfastenersarenotsatisfactoryforreuse,careshould

betakentoselecta replacementfastenerthatisequivalenttotheoriginalquality.

AllRightsReserved

TABLEOFCONTENTS

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GENERALINFORMATION1

A.Engine3

B.Transmission- Manual5

C.Clutch7

D.Transmission- Automatic8

E.FrontSuspension9

F.RearSuspension

Steering

H.Brakes

HeatingandAirConditioningSystem13

BodyandChassis17

II.

ENGINEELECTRICAL19

A.ElectronicIgnitionSystem21

B.StarterMotorCircuit29

C.ChargingSystem32

D.CoolingFanCircuit35

III.

FUELINJECTION39

IV.EMISSIONCONTROLS63

A.LambdaControlSystem65

Idle

SpeedControlSystem77

C.EvaporativeEmissionControlSystem84

D.Air

Inlet

System87

E.IgnitionVacuumAdvanceControl88

F.DecelerationControl89

V.CHASSISELECTRICAL91

A.FusesandFuseBox93

B.RelayCompartment94

C.IgnitionSwitchCircuits96

D.WindshieldWiperSystem99

E.ExteriorLightingCircuit103

F.DoorOperated InteriorLampCircuits

.111

TABLEOFCONTENTS

(con't)

VI.

ENGINEADJUSTMENTS,TESTSANDDIAGNOSIS

A.Adjustments

IgnitionTiming

117

Idle

Speed118

3.COEmission119

B.SystemOperationTests

LambdaSystem122

Idle

SpeedControlSystem

124

C.DiagnosticCharts

IgnitionSystem- "EngineWillNotStart"126

FuelSystem- "EngineWillNotStart"128

3.LambdaSystem130

TroubleshootingDiagnosticChart132

VII.

SPECIFICATIONS& CAPACITIES133

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GENERALINFORMATION

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ENGINE

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GENERALDESCRIPTION

TheDeLoreanispoweredbya liquidcooled,2.8liter,rearmounted,aluminumalloy

90°V-6uneven-fireenginewithtwo(2)chaindrivenoverheadcamshafts.

Theflywheel(orflexplate)endoftheengineisreferredtoasthefrontoftheengine

duetotheuniquerearenginedesign.Therefore,thetimingcoveranddrivebelt

pul-

leysarelocatedattherearoftheengine.Therightand

leftside

oftheengineisdeter-

minedasviewedstandingattherearofthevehiclelookingintotheenginecompart-

ment.

Enginefiringorderis1,6,3,5,2,4.

The

cylinderislocatedattherightfrontoftheenginefollowedwith#2and#3

cyl-

inders.Cylinder#4islocatedattheleftfrontoftheenginefollowedwith#5and#6

cylinders.

CYLINDERCRANKCASEASSEMBLY:Thecylindercrankcaseassemblyconsistsof

aluminumalloyupperandlowercrankcases.Theuppercrankcasecontainssix(6)

castironcylinderlinersandhousesthecrankshaftwhichissupported

byfour(4)

cast

ironmainbearingcaps.Theuppercrankcasealsocontainsthechaindrivenoilpump

driveanddrivengears.Theoilpumpbodyisa machinedportionoftheuppercrank-

case.

Thelowercrankcaseprovidessideenginemountlocationsandcompletesthe

crankcaseassembly.Thealuminumoilpan,whichhouses

theoil

splashshieldandoil

pickupassembly,issecuredtothelowercrankcase.

CYLINDERHEADS:

The

aluminum

alloy

cross-flow

cylinder

heads,havehemispheri-

calchambersandindividualintakeandexhaustportsforeachcylinder.Boththein-

takeandexhaustvalveguides(8MM)arepressedintothecylinderhead.

NOTE:

CYLINDERHEADRESURFACINGISNOTPERMITTED.

Thesteelvalveseatsarefittedtothecylinderhead.

VALVETRAIN:Eachcylinderheadhasa chaindrivenoverheadcamshaft.The

cam-

shaftoperatesbothintakeandexhaustvalvesoneachbankbymeansofadjustable

rockerarmsmountedona single,commonrockershaft.Therockerarmsare

posi-

tionedandheldinplacebymeansoftwo(2)spacersandone(1)thrustspringper

cylinder.

Thehollowrockerarmshaft,whichalsodistributesengineoilthroughcalibrated

holestothevalvetrainandcamshaft,ismountedandsecuredtoeachcylinderhead

withfour(4)rockershaftsupports.

CAMSHAFTANDDRIVE:Eachchaindrivencastironcamshaftissupportedatfour

(4)contactareas.Steelcrankshaftsprocketsdrivethetimingchains(2)whichinturn

drivethecamshaftsprockets(2).J

PISTONSANDCONNECTINGRODS:Eachaluminumalloypistonusestwo(2)com-

pressionringsandone(1)oil

ring.

Thesteelpistonpinhasa floatingfitinthepiston.

Thepinsareretainedintheconnectingrodbya hot'pressfit.Theconnectingrod

bearingsarelubricatedviadrilledoilpassageslocatedinthecrankshaftjournals.

CRANKSHAFT:Thecastironcrankshaftissupportedwithfour(4)mainbearingsand

mainbearingcaps.Thisunevenfireenginecrankshafthasthree(3)connectingrod

journals.Lubricationfortheconnectingrodjournalisdeliveredviadrilledoilpas-

sagesinthecrankshaft,crankshaftmainbearingsandmainbearingjournals.The

crankshaftissealedateachendwitha lip

seal.

Therearethree(3)steeldrivesprocketsmountedonthe

rearof

thecrankshaft.These

three(3)chainsprocketsdrive:

-rightcamshaftsprocket

-leftcamshaftsprocket

-oilpumpsprocket

Thedrivechainsandsprocketsarecoveredbyatimingchaincoverwhichissecured

totheupperandlowercrankcaseassembly.

ENGINECOOLING:Thevehicle

has

two(2)electric

fans

forradiatorcoolingmounted

atthefrontofthevehicle.Thesefansareactivatedwhentheenginecoolanttempera-

tureexceeds

97°C (206°

F)anddeactivatedat

91°C (195°F)

Operationofthesefans

iscontrolledbyatemperatureswitchlocatedonthecoolantreturnpipeintheengine

compartment.

Thewaterpump,locatedattherearoftheengine,isbeltdrivenbythecrankshaft

pul-

ley.Thethermostatishousedinthetopofthewaterpumpunderthethermostathous-

ingcover.Thethermostathousingcoverisequippedwithanairbleedscrewusedto

purgetheairfromthecoolantsystemwhenrefilling.

Coolantleavingtheengineisdirectedthrougha seriesofpipesandhosecouplings

alongthe

leftside

the

vehicle

center

tunneltotheradiator.Coolantleavingthe

radi-

atorisdirectedthrougha seriesofpipesandhosecouplingsalongtherightsideof

thevehiclecentertunneltotheengine.

Thecoolantexpansiontank(fillpoint)locatedontherightsideoftheenginecom-

partment,isconnectedtothecoolantreturnpipebya hose.

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