REV GSection 2 • Specifications July 20072 - 6 GS-3390 • GS-4390 • GS-5390 Part No. 72863Ford LRG-425 EFI EngineDisplacement 153 cu in2.5 litersNumber of cylinders 4Bore & stroke 3.78 x 3.4 inches96.01 x 86.36 mmHorsepower 70 @ 2500 rpm52 kw @ 2500 rpmFiring order 1 - 3 - 4 - 2Low idle (computer controlled) 1600 rpm320 HzHigh idle (computer controlled) 2500 rpm500 HzCompression ratio 9.4:1Compression pressure (approx.)Pressure (psi or bar) of lowest cylinder must beat least 75% of highest cylinderValve clearances - 0.035 to 0.055 inchescollapsed tappet 0.889 to 1.397 mmLubrication systemOil pressure 40 to 60 psi(operating temperature @ 2500 rpm) 2.75 to 4.1 barOil capacity 4.5 quarts(including filter) 4.3 litersOil viscosity requirementsUnits ship with 15W-40.Extreme operating temperatures may require the use ofalternative engine oils. For oil requirements, refer to theEngienOperator Handbook on your machine.Ignition systemSpark plug type Motorcraft AWSF-52-C(before serial number GS9004-41694)Spark plug type Motorcraft AGSF-32-FM(after serial number GS9004-41693)Spark plug gap 0.042 to 0.046 inches1.07 to 1.17 mmEngine coolantCapacity 11.5 quarts10.9 litersStarter motorNormal engine cranking speed 200 to 250 rpmCurrent draw, normal load 140-200ACurrent draw, maximum load 800ACircuit voltage drop 0.5V DCwhile starting, maximum (normal temperature)Brush length, minimum 0.25 in6.35 mmCommutator run-out, maximum 0.005 inches0.127 mmElectronic fuel pumpFuel pressure, static 63 psi4.3 barFuel flow rate 0.58 gpm2.2 L/minAlternatorOutput 95A, 14.5V DCBattery (before serial number 40516)Type 12V DCGroup 34/78Quantity 1Cold cranking ampere 900AReserve capacity @ 25A rate 125 minutesBattery (after serial number 40515)Type 12V DCGroup 31Quantity 1Cold cranking ampere @ 0°F 1000AReserve capacity @ 25A rate 200 minutesSPECIFICATIONS
