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Ford MSG-425 Engine

General Technical Data

Engine Specifications

Engine Model ............... Ford MSG-425 EFI
Engine Type ............... 4-Cycle Inline 4-Cylinder Spark-Ignited Liquid-Cooled Gasoline/LPG
Number of Cylinders ............... 4
Cylinder Arrangement ............... Inline Vertical
Engine Bore, in (mm) ............... 3.50 (89.0)
Engine Stroke, in (mm) ............... 3.93 (100.0)
Displacement, cu.in (L) ............... 152.5 (2.5)
Intermittent Power (Gasoline), hp (kW) ............... 84.0 (62.6) at 3200 rpm
Continuous Power (Gasoline), hp (kW) ............... 75.0 (56.0) at 3200 rpm
Intermittent Power (LPG), hp (kW) ............... 81.0 (60.4) at 3200 rpm
Continuous Power (LPG), hp (kW) ............... 72.0 (53.7) at 3200 rpm
Intermittent Power (NG), hp (kW) ............... 74.0 (55.2) at 3200 rpm
Continuous GPower (NG), hp (kW) ............... 65.0 (48.5) at 3200 rpm
Intermittent Torque (Gasoline), lb-ft (Nm) ............... 137.0 (185.0) at 3200 rpm
Intermittent Torque (LPG), lb-ft (Nm) ............... 136.0 (184.4) at 3200 rpm
Intermittent Torque (NG), lb-ft (Nm) ............... 125.0 (169.5) at 3200 rpm
Rated Engine Speed, rpm ............... 2500-3200
Low Idle Speed, rpm ............... 750-900
High Idle Speed, rpm ............... 2800-3200
Compression Ratio ............... 9.7:1
Firing Order ............... 1-3-4-2
Cylinder Block Material ............... Cast Aluminum Alloy AA319 Cosworth Process
Cylinder Liner Type ............... Cast-in-Place Dry Iron Liners
Cylinder Head Material ............... Cast Aluminum Alloy
Camshaft Design ............... Dual Overhead Camshaft DOHC
Camshaft Drive Type ............... Chain-Driven with Automatic Tensioning System
Valve Seat Material ............... Hardened Sintered Metal Gas Operation Optimized
Valve Guide Material ............... Sintered Iron Alloy Alternative Fuel Hardened
Valvetrain Configuration ............... 4 Valves Per Cylinder 16 Valves Total
Valvetrain Adjustment ............... Set-for-Life Valve Lifters Mechanical Tappets
Engine Control Module ............... Electronic Engine Management Module GCP
Crankcase Ventilation System ............... Closed Positive Crankcase Ventilation PCV Valve
Exhaust Emission Control System ............... Three-Way Catalyst Closed Loop
Lubrication System ............... Full-Pressure Feed Closed Circuit
Oil Pump Type ............... Crankshaft-Driven Inner Gear Gerotor
Oil Filter Type ............... Full-Flow Spin-On Disposable Cartridge
Cooling System ............... Forced Liquid Circulation with Thermostat
Water Pump Type ............... Belt-Driven Centrifugal Flow
Air Cleaner Type ............... Heavy Duty Dry Dual Stage Element with Pre-Cleaner
Starting System ............... 12V Electric Starter Motor Lockout Protection
Ignition System ............... Electronic Distributorless Coil-on-Plug
Ignition Coil Config ............... Individual Dedicated Cylinder Coils
Electrical System ............... 12V negative ground system
Alternator Rating ............... 70-95A

Fuel System

Fuel Injection Type ............... Gasoline Sequential Port Fuel Injection SEFI
Fuel System Adaptation ............... Alternative Fuel Ready Multifuel Configuration
Gaseous Fuel Configurations ............... Liquefied Petroleum Gas LPG or Natural Gas NG
Fuel Control Type ............... Closed Loop Lambda Oxygen Sensor Control
Governor System ............... Electronic Drive-by-Wire Variable Speed
Gasoline Fuel Specification ............... 87 Octane Standard or 80 Octane Minimum
LPG Fuel Specification ............... HD-5 Propane Industrial Grade
Natural Gas Fuel Specification ............... High Methane Pipeline Quality Dry Gas
Gasoline Fuel Pressure Range, psi (kPa) ............... 50.0-60.0 (344.7-413.7)
LPG Liquid Inlet Pressure, psi (kPa) ............... 150.0-312.0 (1034.2-2151.1)
LPG Regulated Vapor Pressure, psi (kPa) ............... 0.3-0.5 (2.0-3.4)
NG Inlet Regulator Pressure, psi (kPa) ............... 10.0-30.0 (68.9-206.8)
NG Regulated Manifold Pressure, in H2O (kPa) ............... 4.0-6.0 (1.0-1.5)
Fuel Injector Impedance Gasoline, ohms ............... 11.5-15.5
Fuel Injector Impedance Gaseous DEPR, ohms ............... 9.0-13.0
Electronic Throttle Body Actuator Type ............... DC Motor Drive-by-Wire H-Bridge Control
Throttle Position Sensor Sensor Resistance, ohms ............... 500.0-1200.0
Mass Air Flow Sensor Signal Output, V ............... 0.5-4.5
Manifold Absolute Pressure Sensor Range, in Hg (kPa) ............... 3.0-31.5 (10.0-105.0)
Oxygen Sensor Type ............... Heated Exhaust Gas Oxygen HEGO Four-Wire
Oxygen Sensor Heater Resistance, ohms ............... 3.5-5.5
Fuel Filter Location ............... External In-line Chassis Mounted Location
Fuel Pump Assembly Type ............... Electric Tank-Mounted or In-Line Booster Pump
Maximum Fuel Return Flow Gasoline, gph (L/h) ............... 15.0 (56.7)
Gaseous Fuel Lock-off Valve Voltage, V ............... 12.0 DC Nominal
Gaseous Fuel Lock-off Coil Resistance, ohms ............... 22.0-28.0
Fuel Trim Adaptation Limits Percentage ............... 20.0 Percent Plus or Minus
Catalytic Converter Configuration ............... Single Under-Floor Integrated Bed Housing
Air-Fuel Ratio Gasoline Stoichiometric Ratio ............... 14.7:1
Air-Fuel Ratio LPG Stoichiometric Ratio ............... 15.5:1
Air-Fuel Ratio NG Stoichiometric Ratio ............... 17.2:1

Dimensions and Weight

Overall Length, in (mm) ............... 30.3 (770)
Overall Width, in (mm) ............... 23.3 (590)
Overall Height, in (mm) ............... 32.6 (830)
Dry Weight, lbs (kg) ............... 351 (159)

Maintenance Data

Service Information

Compression Pressure Minimum, psi (kPa) ............... 135.0 (930.8)
Maximum Variance Between Cylinders, psi (kPa) ............... 15.0 (103.4)
Oil Pressure at Rated Speed, psi (kPa) ............... 30.0-55.0 (206.8-379.2)
Oil Pressure at Idle Speed, psi (kPa) ............... 12.0 (82.7)
Normal Engine Coolant Temperature, F (C) ............... 185.0-215.0 (85.0-101.6)
Maximum Engine Coolant Temperature, F (C) ............... 225.0 (107.2)
Thermostat Opening Temperature, F (C) ............... 180.0 (82.2)
Thermostat Full Open Temperature, F (C) ............... 202.0 (94.4)
Spark Plug Type ............... Motorcraft AGSF-22FCM or Equivalent
Spark Plug Gap, in (mm) ............... 0.037-0.041 (0.95-1.05)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, SAE 15W-40
API Service Classifications ......................... SM or SN, GF-4 or GF-5
Engine Oil Capacity with Filter, qts (L) ............... 7.0 (6.6)
Engine Oil Capacity (Initial Dry Fill), qts (L) ............... 8.0 (7.5)
Coolant Capacity (Engine Base), qts (L) ............... 3.5 (3.3)

Service Intervals

Change engine oil ............... Every 100 hours
Replace oil filter ............... Every 100 hours
Replace fuel filter ............... Every 500 hours
Inspect air filter ............... Every 50 hours
Replace air filter ............... Every 500 hours
Change coolant ............... Every 2000 hours
Valve-lash adjustment ............... Every 1000 hours
Check fuel system ............... Every 1000 hours
Replace spark plug ............... Every 1000 hours
Compression test ............... Every 1000 hours
Belt inspection ............... Every 150 hours

Service Specifications

Cylinder Bore Inside Diameter, in (mm) ............... 3.5039 (89.000)
Cylinder Bore Inside Diameter (Maximum), in (mm) ............... 3.5043 (89.011)
Cylinder Bore Out-of-Round, in (mm) ............... 0.0003 (0.008)
Crankshaft Main Journal Outer Diameter, in (mm) ............... 2.047 (52.0)
Crankpin Journal Outer Diameter, in (mm) ............... 1.968 (50.0)
Connecting Rod Big End Side Clearance, in (mm) ............... 0.0055-0.0118 (0.14-0.30)
Connecting Rod Bearing Journal Clearance, in (mm) ............... 0.0011-0.0020 (0.029-0.052)
Crankshaft Main Bearing Clearance, in (mm) ............... 0.0009-0.0017 (0.025-0.045)
Crankshaft Axial End Play, in (mm) ............... 0.0035-0.0094 (0.09-0.24)
Piston Skirt Outer Diameter, in (mm) ............... 3.498 (88.85)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0010-0.0018 (0.025-0.045)
Piston Pin Bore Inside Diameter, in (mm) ............... 0.866 (22.0)
Piston Pin Outer Diameter, in (mm) ............... 0.8659-0.8661 (21.995-22.000)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0003-0.0005 (0.008-0.013)
Piston Pin to Con Rod Bushing Clearance, in (mm) ............... 0.0005-0.0011 (0.014-0.029)
Top Ring Groove Width, in (mm) ............... 0.047 (1.2)
Second Ring Groove Width, in (mm) ............... 0.047 (1.2)
Oil Ring Groove Width, in (mm) ............... 0.078 (2.0)
Top Ring End Gap, in (mm) ............... 0.0063-0.0122 (0.16-0.31)
Second Ring End Gap, in (mm) ............... 0.0130-0.0189 (0.33-0.48)
Oil Ring End Gap, in (mm) ............... 0.0078-0.0275 (0.20-0.70)
Top Ring Groove Side Clearance, in (mm) ............... 0.0011-0.0027 (0.03-0.07)
Second Ring Groove Side Clearance, in (mm) ............... 0.0011-0.0027 (0.03-0.07)
Oil Ring Groove Side Clearance, in (mm) ............... 0.0003-0.0031 (0.01-0.08)
Cylinder Head Surface Deck Maximum Distortion, in (mm) ............... 0.003 (0.08)
Cylinder Block Surface Top Deck Flatness, in (mm) ............... 0.002 (0.05)
Intake Valve Head Diameter, in (mm) ............... 1.378 (35.0)
Exhaust Valve Head Diameter, in (mm) ............... 1.181 (30.0)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.2152-0.2159 (5.465-5.485)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.2148-0.2155 (5.455-5.475)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0005-0.0021 (0.015-0.055)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0009-0.0025 (0.025-0.065)
Valve Guide Inside Diameter, in (mm) ............... 0.2165-0.2173 (5.500-5.520)
Intake Valve Seat Angle, deg ............... 45.0
Exhaust Valve Seat Angle, deg ............... 45.0
Valve Springs Free Length, in (mm) ............... 1.779 (45.2)
Camshaft Journal Outer Diameter (№1), in (mm) ............... 1.0214-1.0222 (25.945-25.965)
Camshaft Journal Outer Diameter (№2), in (mm) ............... 0.9427-0.9435 (23.945-23.965)
Camshaft Journal Clearance, in (mm) ............... 0.0013-0.0029 (0.035-0.075)
Camshaft Axial End Play, in (mm) ............... 0.0031-0.0078 (0.08-0.20)
Cam Lobe Height (Intake), in (mm) ............... 0.366 (9.3)
Cam Lobe Height (Exhaust), in (mm) ............... 0.334 (8.5)

Tightening Torques

Cylinder Head Fasteners (1-Step), lb-ft (Nm) ............... 3.7 (5.0)
Cylinder Head Fasteners (2-Step), lb-ft (Nm) ............... 11.0 (15.0)
Cylinder Head Fasteners (3-Step), lb-ft (Nm) ............... 33.2 (45.0)
Cylinder Head Fasteners (4-Step), deg ............... 90 Angle Turn
Cylinder Head Fasteners (5-Step), deg ............... 90 Additional Angle Turn
Crankshaft Main Bearing Cap Bolts (1-Step), lb-ft (Nm) ............... 14.7 (20.0)
Crankshaft Main Bearing Cap Bolts (2-Step), lb-ft (Nm) ............... 29.5 (40.0)
Crankshaft Main Bearing Cap Bolts (3-Step), deg ............... 90 Angle Turn
Connecting Rod Cap Fasteners (1-Step), lb-ft (Nm) ............... 18.4 (25.0)
Connecting Rod Cap Fasteners (2-Step), deg ............... 90 Angle Turn
Flywheel Fasteners, lb-ft (Nm) ............... 54.0-64.0 (73.2-86.7)
Flywheel Flex-Plate Conversion Fasteners, lb-ft (Nm) ............... 20.0 (27.0)
Flywheel Housing Face Attaching Bolts, lb-ft (Nm) ............... 25.8 (35.0)
Camshaft Bearing Cap Screws, lb-ft (Nm) ............... 11.8 (16.0)
Engine Structural Front Timing Fasteners, lb-ft (Nm) ............... 8.8 (12.0)
Engine Camshaft Cover Fasteners, lb-ft (Nm) ............... 7.3 (10.0)
Engine Die-Cast Aluminum Oil Pan Fasteners, lb-ft (Nm) ............... 18.4 (25.0)
Oil Pan Drain Plug, lb-ft (Nm) ............... 20.6 (28.0)
Crankshaft Main Drive Pulley Damper Bolt, lb-ft (Nm) ............... 73.7 (100.0)
Camshaft Timing Sprocket Attaching Bolts, lb-ft (Nm) ............... 44.2 (60.0)
Camshaft Timing Chain Fixed Mounting Studs, lb-ft (Nm) ............... 7.3 (10.0)
Camshaft Timing Chain Automatic Tensioner Bolts, lb-ft (Nm) ............... 7.3 (10.0)
Cylinder Block Knock Sensor Core Housing Stud, lb-ft (Nm) ............... 14.7 (20.0)
Engine Block Crankshaft Position Sensor Screw, lb-ft (Nm) ............... 5.1 (7.0)
Cylinder Head Camshaft Position Sensor Screw, lb-ft (Nm) ............... 5.1 (7.0)
Temperature Fluid Thermistor Sensor, lb-ft (Nm) ............... 11.0 (15.0)
Exhaust Manifold Standard Body Flange Bolts, lb-ft (Nm) ............... 7.3 (10.0)
Exhaust Manifold-to-Cylinder Head Exhaust Nuts, lb-ft (Nm) ............... 40.5 (55.0)
Intake Manifold-to-Cylinder Head Intake Screws, lb-ft (Nm) ............... 14.7 (20.0)
Engine Spark Plugs Threaded Core, lb-ft (Nm) ............... 11.0 (15.0)
Ignition Individual Coil-on-Plug Attaching Screws, lb-ft (Nm) ............... 5.1 (7.0)
Oil Pump Interior Core Housing Attaching Main Bolts, lb-ft (Nm) ............... 7.3 (10.0)
Water Pump-to-Cylinder Block Housing Fasteners, lb-ft (Nm) ............... 7.3 (10.0)
Coolant Distribution Tube Body Housing Fasteners, lb-ft (Nm) ............... 7.3 (10.0)
Thermostat Core Housing Attaching Screws, lb-ft (Nm) ............... 7.3 (10.0)
Oil Pressure Switch Indicator Terminal Screw, lb-ft (Nm) ............... 11.0 (15.0)
Heated Exhaust Oxygen Sensor Hex Head Base Boss, lb-ft (Nm) ............... 33.2 (45.0)
Air Intake Throttle Valve Actuator Body Mounting Bolts, lb-ft (Nm) ............... 7.3 (10.0)
Fuel Injection Rail Distribution Assembly Mounting Bolts, lb-ft (Nm) ............... 18.4 (25.0)
Crankcase Oil Breather Air Separator Cover Screws, lb-ft (Nm) ............... 7.3 (10.0)
Alternator Structural Main Bracket-to-Block Bolts, lb-ft (Nm) ............... 33.2 (45.0)
Alternator Pivot Slide Adjustment Securing Bolt, lb-ft (Nm) ............... 18.4 (25.0)
Starter Motor-to-Flywheel Housing Fixing Bolts, lb-ft (Nm) ............... 25.8 (35.0)
Accessory Drive Belt Automatic Tensioner Bracket Bolt, lb-ft (Nm) ............... 18.4 (25.0)
Accessory Drive Belt Stationary Idler Pulley Bolt, lb-ft (Nm) ............... 18.4 (25.0)
Engine Front Lifting Eye Steel Bracket Attaching Studs, lb-ft (Nm) ............... 18.4 (25.0)
Engine Rear Lifting Eye Steel Bracket Attaching Studs, lb-ft (Nm) ............... 18.4 (25.0)
Crankcase Oil Sump Baffle Internal Deflector Screws, lb-ft (Nm) ............... 7.3 (10.0)
Fuel Pressure Sensor In-Line Adapter Fitting, lb-ft (Nm) ............... 14.7 (20.0)
ECM Isolation Mounting Bracket Fasteners, lb-ft (Nm) ............... 7.3 (10.0)

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