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
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