MP8 425M ENGINE

BORN TO GO THE DISTANCE

• GreenhouseGas2014Certified,OBD2013Certified•HighTorqueMAXIDYNE™DieselEngine• CooledExhaustGasRecirculation(CEGR)•MaximumHorsepower425HP[317kW]• ElectronicUnitFuelInjectionwithRateShaping• V-MACIV®TotalVehicleElectronicsSystem•WideOperatingRange1100-2100RPM•ChassisMountedChargeAirCooled• VariableGeometryTurbocharger• ExtendedServiceIntervals•MACKPowerLeash™EngineBrake

FEATURES ENGINE PERFORMANCE

ENGINE SPECIFICATIONS

PEAK POWER 425HP[317kW]@1500-1800RPM

POWER @ GOVERNED RPM 331HP[247kW]@2100RPM

MAX. TORQUE 1540lb-ft[2088N•m]@1100-1400RPM

TYPE DirectInjectionDiesel

NUMBER OF CYLINDERS 6,In-Line

BORE & STROKE 5.16"x6.22"[131mmx158mm]

DISPLACEMENT 780[13]

COMPRESSION RATIO 16:1

FIRING ORDER 1-5-3-6-2-4

TORQUE RISE 89%

CLUTCH ENGAGEMENT 825lb-ft[1119N•m]@800RPM

IDLE SPEEDS Low:600RPMAdjustable–High:2100RPM

ENGINE BRAKE RETARDING POWER 500HP[372kW]@2100RPM

DRY WEIGHT (APPROX) 2676lbs[1217kg]

MP8 425M ENGINE

MP8 425M ENGINE

FUEL SYSTEM

LUBRICATION SYSTEM

COOLING SYSTEM

COMPONENT SPECIFICATIONS

FLYWHEEL HOUSING

CYLINDER BLOCK

CYLINDER LINERS

CYLINDER HEAD ASSEMBLY

PISTONS & RINGS

CRANKSHAFT

CHARGE AIR COOLING

AIR COMPRESSOR

TURBOCHARGER

ACCESSORY BELT

EGR SYSTEM

DieCastAluminum

AlloyedCastIron,LadderFrameReinforcement

FullWetDesign Surface Finish –PlateauHoned

CastIronSlabHeadwithIntermediateDeckSingleOverheadCam Configuration –4Valves/Cylinder,OHV Valve Type –Poppet Valve/Insert Material –SuperAlloy(Serviceable)

Monotherm™SinglePieceSteelwithClosedCoolingGallery Pin Diameter –2.125"[54mm] Rings –2Compression,1OilControl

Forged,CarbonSteel Heat Treatment –Induction-HardenedJournals/Fillet Main Bearing Diameter –4.5"[114mm]

ChassisMounted,Air-To-Air

Delphi™E3ElectronicUnitInjectorswith2SolenoidValveTechnology andRateShaping Fuel Supply Pump –ZFMeritor™ Filter –SpinOn,Disposable

FullPressure,WetSump Oil Filters –2Spin-OnFullFlowDisposable,1By-Pass Oil Cooler –StainlessSteelPlate Axle Forward Total Oil Capacity –34.8qts[33L](includesfilters) Axle Back Total Oil Capacity –39.1qts[38L](includesfilters) Drain Plug –Magnetic

Total Circuit Capacity –17qts[16L] Thermostats –180°F[82°C] Hose Material –Silicone

Meritor/WABCO CHU, CXU, GU7, GU8 Standard Capacity –18.7cfm[8.9L/s] MRU, LEU Standard Capacity –37.4cfm[17.8L/s] Holset,SlidingNozzleRingVariableGeometrywithWaterCooled ActuatorBearingsandElectronicControls

Poly-VwithAutomaticTensioners

Single Valve Assembly –ModulatedCastStainlessSteel Cooler –StainlessSteelTubeandInsert,GastoCoolant

Propergearingisnecessarytoachieveoptimumvehicleperformanceandfueleconomy.Vehiclespecifications,includingengine,transmission,axleratio,andtireselection,shouldbeselectedtomeetthefollowingcriteria:

*CruiseRPM=Enginespeedintopgear@DesiredCruiseSpeed

RefertotheMACKTRAQ®electronicsalestooltoobtainstartability,gradeabilityandcruiseRPMresultsforspecificvehiclespecifications.Specialserviceapplications,roadsurfaces,highGCW’sorotherfactorsmayrequiredifferentgearingconsiderations.

The information in this document was accurate as of the date of the publication. Illustrations may not be representative of current product. Mack Trucks, Inc. reserves the right to make changes in specifications, equipment or design, or to discontinue models or options without notice at any time.

ENG 174 1001657 16A 09/10/2014

SALES ENGINEERINGMackTrucks.com

4thGenerationVehicleManagementAndControlSystem

PRODUCTIVITY PTO(4)andElectronicHandThrottleControl Engine“SmartFanControl” IntegratedSleeperLowVoltageDisconnect†

“SmartIdle”SpeedRegulator GuardDog™RoutineMaintenanceMonitoring†

DRIVER CONVENIENCE FullFeaturedCruiseControl Cruise‘nBrakeEngineBrakeControl ProgrammableEngineGovernorType IdleCooldown DaytimeRunningLight(DRL)Override†

FUEL ECONOMY VehicleSpeedLimiting Engine“SweetSpotIndicator” FuelEconomyIncentiveProgram IdleShutdown

RELIABILITY EngineProtection StarterProtection DifferentialLockAutoControl

FLEET MANAGEMENT DataMax™ComprehensiveOn-BoardDataLogger

SAFETY AND SECURITY SpeedSensorTamperResistance TheftDeterrence 5thWheelSlideUnlockedVehicleSpeedLimiting AirSuspensionDeflatedVehicleSpeedLimiting

SERVICEABILITY SAEJ1587andJ1939DiagnosticPort ElectronicFaultLoggingwithFaultReporter VCADSPCBasedServiceSoftware

†Optional

NOTE:RefertothelatestversionofMackMaintenance&LubricationManualTS494foroil/filterserviceintervals.

V-MAC IV® FEATURES GEARING RECOMMENDATIONS

HighwayApplications≥10%On-OffHighwayApplications≥16%

@CruiseMax.MPH≥0.5%@PeakTorque,TopGear≥1.5%

1350-1450RPM*

STARTABILITY

GRADEABILITY

CRUISE RPM

HighCapacityAirCompressor120and240VoltEngineBlockHeatersHighCapacityAlternator

**Availabilitymaybechassismodeldependent

OPTIONAL EQUIPMENT**

MP8 425M ENGINE