________________________________________________________________________________

Ford LRG-425i Engine

General Technical Data

Engine Specifications

Engine Model ............... Ford LRG-425i
Engine Production Family ............... Ford Power Products Industrial Series
Engine Block Design ............... 4-cycle Inline 4-Cylinder
Cylinder Arrangement ............... Vertical In-line
Engine Bore Diameter, in (mm) ............... 3.78 (96.0)
Piston Stroke Length, in (mm) ............... 3.40 (86.3)
Total Displacement, CID (L) ............... 153 (2.5)
Maximum Intermittent Power, hp (kW) ............... 74 (55) at 3000 rpm
Maximum Continuous Power, hp (kW) ............... 63 (47) at 3000 rpm
Peak Intermittent Torque, lb-ft (Nm) ............... 135 (183) at 2400 rpm
Peak Continuous Torque, lb-ft (Nm) ............... 115 (156) at 2400 rpm
Base Idle Speed Range, rpm ............... 700-900
Low Idle Operational Limit, rpm ............... 650
High Idle Speed Electronic Limit, rpm ............... 3800
Velocity Governor Speed Limit, rpm ............... 2800
Firing Order ............... 1-3-4-2
Compression Ratio Rating ............... 9.37:1
Cylinder Block Material ............... Heavy Duty Cast Iron Alloy
Cylinder Head Material ............... Cast Iron Cross-Flow Design
Camshaft Placement Configuration ............... Single Overhead Cam SOHC
Number of Valves per Cylinder ............... 2
Total Number of Valve ............... 8
Valve Lifter Internal Design ............... Hydraulic Self-Adjusting Lash Tappets
Aspiration Configuration Type ............... Naturally Aspirated
Combustion Chamber Layout ............... Fast Burn Multi-Fuel Design
Crankshaft Main Bearings Quantity ............... 5 Bearings with Thrust on Center Journal
Camshaft Bearings Quantity ............... 4 Bearings in Cylinder Head journals
Crankshaft Rotation Direction Front ............... Clockwise from Pulley View
Flywheel Rotation Direction Rear ............... Counterclockwise from Flywheel View
Lubrication System ............... Full-Pressure Feed System
Oil Pump Architecture ............... Internal Gear-Driven Rotor Assembly
Oil Filtration Element Style ............... Spin-On Full-Flow Canister
Cooling System Temperature Control ............... Liquid-Cooled Closed Loop System
Coolant Pump Type ............... Centrifugal Belt-Driven Housing Assembly
Air Intake Filtration ............... Heavy Duty Dual-Stage Dry Element
Emission Certification ............... EPA and ARB Certified Packages Available
Starting System ............... 12V DC Electric Starter Motor
Electrical System ............... 12V Negative Ground System
Alternator Output ............... 95A
Starter Motor Rating ............... 1.4kW

Fuel System

Fuel Injection Configuration Type ............... Electronic Fuel Injection EFI Multi-Port
Alternative Multi-Fuel Capacity Config ............... Liquefied Petroleum Gas LPG or Natural Gas NG
Electronic Management Control Computer ............... Electronic Engine Control Module ECM
Fuel Injector Coil Internal Resistance, ohms ............... 12.0-16.0
Fuel Rail Operating Pressure Gasoline, psi (kPa) ............... 39.0 (269.0)
Fuel Pressure Regulator Operating Range, psi (kPa) ............... 35.0-45.0 (241.0-310.0)
Fuel Supply Pump Architecture ............... Electric High-Pressure Tank-Mounted or Inline Design
Fuel Pump Max Delivery Pressure Capacity, psi (kPa) ............... 60.0 (414.0)
Fuel Pump Minimum Delivery Flow Rate, gal/hr (L/hr) ............... 30.0 (113.6)
Fuel Primary Filter Rating, microns ............... 10
Fuel Filter Placement Configuration ............... External Chassis Mounted Inline Element
LPG Liquid Supply Vaporizer Type ............... Two-Stage Heated Regulator Assembly
LPG Lock-Off Shutoff Valve Actuation ............... 12V DC Electric Solenoid Mechanism
Natural Gas Mixer Design Architecture ............... Air-Fuel Ratio Controlled Diaphragm Unit
Natural Gas Inlet Supply Pressure, in H2O (kPa) ............... 7.0-11.0 (1.74-2.74)
Throttle Body Internal Bore Diameter, in (mm) ............... 2.16 (55.0)
Throttle Position Sensor Voltage Output Idle, V ............... 0.5-0.9
Throttle Position Sensor Voltage Output Wide Open, V ............... 4.0-4.8
Idle Air Control Bypass Valve Style ............... Pulse Width Modulated Electronic Solenoid
Manifold Absolute Pressure Sensor Range, in Hg (kPa) ............... 0.0-30.0 (0.0-101.6)
Oxygen Sensor Quantity and Placement ............... 1 Heated Sensor Pre-Catalyst Placement
Target Air-Fuel Ratio Stoichiometric Gasoline ............... 14.7:1
Target Air-Fuel Ratio Stoichiometric Propane ............... 15.5:1
Target Air-Fuel Ratio Stoichiometric Natural Gas ............... 17.2:1
Fuel Trim Self Correction Range Limit ............... Max 25 percent plus or minus deviation
Fuel Rail Return Hose Internal Diameter, in (mm) ............... 0.25 (6.35)
Fuel Rail Feed Hose Internal Diameter, in (mm) ............... 0.31 (7.94)
Evaporative Emission Purge Valve Control ............... Electronic On-Off Solenoid Duty-Cycled

Dimensions and Weight

Overall Length, in (mm) ............... 24.1 (610)
Overall Width, in (mm) ............... 19.8 (500)
Overall Height, in (mm) ............... 32.7 (830)
Dry Weight, lbs (kg) ............... 339 (154)
Operating Weight, lbs (kg) ............... 385 (175)

Maintenance Data

Service Information

Cylinder Compression Pressure, psi (kPa) ............... 150 (1034)
Engine Oil Pressure at 2000 rpm, psi (kPa) ............... 40.0-60.0 (276.0-414.0)
Engine Oil Pressure at Low Idle, psi (kPa) ............... 15.0 (103.4)
Thermostat Valve Opening Temperature, F (C) ............... 180 (82)
Thermostat Valve Full Open Temperature, F (C) ............... 202 (94.4)
Radiator Cap Pressure Rating, psi (kPa) ............... 13.0 (89.6)
Spark Plug Type ............... Motorcraft AWSF-32PP
Spark Plug Gap, in (mm) ............... 0.044 (1.12)
Alternator Belt Deflection Under 10 lb Load, in (mm) ............... 0.25-0.38 (6.4-9.7)
Ignition Timing Base Angle, deg BTDC ............... 10.0
Ignition Timing Max Dynamic, deg BTDC ............... 32.0

Engine Oil and Coolant

Engine Oil Type .................. SAE 5W-30, SAE 10W-30
API Service Classifications ......................... SG, SH, or SJ
Engine Oil Capacity with Filter Change, qt (L) ............... 4.5 (4.26)
Engine Oil Capacity (Initial Dry Fill), qt (L) ............... 5.0 (4.73)
Cooling System Capacity, qt (L) ............... 8.5 (8.0)

Service Intervals

Change engine oil ............... Every 150 hours
Replace oil filter ............... Every 150 hours
Replace fuel filter ............... Every 300 hours
Inspect air filter ............... Every 50 hours
Replace air filter ............... Every 250 hours
Change coolant ............... Every 1000 hours
Valve-lash adjustment ............... Every 300 hours
Check fuel system ............... Every 1000 hours
Replace spark plug ............... Every 500 hours
Compression test ............... Every 1000 hours
Belt inspection ............... Every 150 hours

Service Specifications

Cylinder Bore Inside Diameter, in (mm) ............... 3.780-3.782 (96.01-96.06)
Cylinder Bore Ovality Out of Round, in (mm) ............... 0.001 (0.025)
Cylinder Bore Vertical Taper, in (mm) ............... 0.001 (0.025)
Connecting Rod Big End Bore I.D, in (mm) ............... 2.126-2.127 (54.00-54.03)
Connecting Rod Bearing Journal Clearance, in (mm) ............... 0.0010-0.0024 (0.025-0.061)
Connecting Rod Big End Side Clearance, in (mm) ............... 0.004-0.011 (0.10-0.28)
Crankshaft Main Bearing Journal Diameter, in (mm) ............... 2.399-2.400 (60.93-60.96)
Crankshaft Main Bearing Journal Clearance, in (mm) ............... 0.0010-0.0026 (0.025-0.066)
Crankpin Journal Diameter, in (mm) ............... 2.046-2.047 (51.97-52.00)
Crankshaft Axial End Play, in (mm) ............... 0.004-0.008 (0.10-0.20)
Piston Skirt Outer Diameter, in (mm) ............... 3.777-3.779 (95.94-95.99)
Piston to Cylinder Wall Clearance, in (mm) ............... 0.0018-0.0026 (0.046-0.066)
Piston Pin Bore Inside Diameter, in (mm) ............... 0.9122-0.9125 (23.170-23.178)
Piston Pin Outer Diameter, in (mm) ............... 0.9118-0.9120 (23.160-23.165)
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) ............... 0.0005-0.0009 (0.013-0.023)
Top Ring Groove Side Clearance, in (mm) ............... 0.0020-0.0035 (0.051-0.089)
Second Ring Groove Side Clearance, in (mm) ............... 0.0015-0.0030 (0.038-0.076)
Oil Ring Groove Side Clearance, in (mm) ............... 0.0015-0.0035 (0.038-0.089)
Top Ring End Gap, in (mm) ............... 0.010-0.020 (0.25-0.51)
Second Ring End Gap, in (mm) ............... 0.012-0.022 (0.30-0.56)
Oil Ring End Gap, in (mm) ............... 0.015-0.035 (0.38-0.89)
Cylinder Head Gasket Mating Flatness Deviation Max, in (mm) ............... 0.003 (0.076)
Cylinder Block Fire Deck Flatness Deviation Max, in (mm) ............... 0.003 (0.076)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.316-0.317 (8.03-8.05)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.315-0.316 (8.00-8.03)
Valve Guide Internal Bored Tube Inside Diameter, in (mm) ............... 0.318-0.319 (8.08-8.10)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0010-0.0025 (0.025-0.064)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0015-0.0030 (0.038-0.076)
Intake Valve Seat Width, in (mm) ............... 0.060-0.080 (1.52-2.03)
Exhaust Valve Seat Width, in (mm) ............... 0.070-0.090 (1.78-2.29)
Intake Valve Head Margin Thickness, in (mm) ............... 0.045 (1.14)
Exhaust Valve Head Margin Thickness, in (mm) ............... 0.055 (1.40)
Valve Seat Angle, deg ............... 45.0
Valve Face Angle, deg ............... 44.0
Valve Spring Free Length, in (mm) ............... 1.95 (49.5)
Camshaft Journal Outer Diameter (Number 1), in (mm) ............... 1.769-1.770 (44.93-44.96)
Camshaft Journal Outer Diameter (Number 2), in (mm) ............... 1.789-1.790 (45.44-45.47)
Camshaft Journal Outer Diameter (Number 3), in (mm) ............... 1.809-1.810 (45.95-45.98)
Camshaft Journal Outer Diameter (Number 4), in (mm) ............... 1.829-1.830 (46.46-46.49)
Camshaft Journal Bearing Clearance, in (mm) ............... 0.0015-0.0035 (0.038-0.089)
Cam Lobe Height (Intake), in (mm) ............... 0.235 (5.97)
Cam Lobe Height (Exhaust), in (mm) ............... 0.245 (6.22)
Camshaft Axial Thrust End Play, in (mm) ............... 0.003-0.007 (0.08-0.18)
Auxiliary Shaft Journal Outer Diameter, in (mm) ............... 1.623-1.624 (41.22-41.25)
Auxiliary Shaft Radial Journal Clearance, in (mm) ............... 0.0010-0.0030 (0.025-0.076)

Tightening Torques

Cylinder Head Joint Fastener Bolt (Step 1), lb-ft (Nm) ............... 50 (68)
Cylinder Head Joint Fastener Bolt (Step 2), lb-ft (Nm) ............... 70 (95)
Cylinder Head Joint Fastener Bolt (Step 3), lb-ft (Nm) ............... 80-90 (108-122)
Main Bearing Cap Support Stud Bolt, lb-ft (Nm) ............... 85-95 (115-129)
Connecting Rod Cap Hinge Joint Nut (Step 1), lb-ft (Nm) ............... 25 (34)
Connecting Rod Cap Hinge Joint Nut (Step 2), lb-ft (Nm) ............... 40-45 (54-61)
Flywheel Mounting Hub Attachment Bolt, lb-ft (Nm) ............... 54-64 (73-87)
Crankshaft Pulley Vibration Damper Center Bolt, lb-ft (Nm) ............... 100-120 (136-163)
Camshaft Timing Sprocket Cog Center Bolt, lb-ft (Nm) ............... 50-60 (68-81)
Camshaft Thrust Retaining Plate Screws, lb-ft (Nm) ............... 6-9 (8-12)
Rocker Arm Cover Top Gasket Compression Bolt, lb-ft (Nm) ............... 6-8 (8-11)
Timing Belt Cover Sheet Protection Plastic Fastener, lb-ft (Nm) ............... 6-9 (8-12)
Timing Belt Tensioner Idler Pulley Locking Pivot Bolt, lb-ft (Nm) ............... 14-21 (19-28)
Oil Pump Assembly Structural Housing to Block Bolt, lb-ft (Nm) ............... 14-21 (19-28)
Oil Pan Outer Edge Base Flange Structural Bolt, lb-ft (Nm) ............... 10-13 (14-18)
Oil Pan Sump Base Fluid Discharge Plugs, lb-ft (Nm) ............... 15-25 (20-34)
Intake Manifold Fuel Air Induction Housing Bracket Bolt, lb-ft (Nm) ............... 15-22 (20-30)
Exhaust Manifold Thermal Gas Collector Attachment Nuts, lb-ft (Nm) ............... 15-22 (20-30)
Water Pump Structural Housing Flange Attachment Bolt, lb-ft (Nm) ............... 14-21 (19-28)
Thermostat Outer Fluid Housing Exit Cover Bolt, lb-ft (Nm) ............... 14-21 (19-28)
Spark Plug Core Shell Combustion Wall Installation, lb-ft (Nm) ............... 7-15 (9-20)
Distributor Base Bracket Position Clamp Locking Bolt, lb-ft (Nm) ............... 14-21 (19-28)
Alternator Structural Swing Pivot Base Support Bolt, lb-ft (Nm) ............... 25-35 (34-47)
Alternator Adjustment Arm Tension Slider Locking Bolt, lb-ft (Nm) ............... 14-21 (19-28)
Starter Motor Flange Nose Cone Structural Fixing Bolt, lb-ft (Nm) ............... 15-20 (20-27)
Flywheel Housing Rear Shield Adapter Plate Outer Bolt, lb-ft (Nm) ............... 28-38 (38-52)
Fuel Rail Mounting Bracket Base Attachment Stud Bolt, lb-ft (Nm) ............... 15-22 (20-30)
Throttle Body Air Entry Flange Attachment Bolt, lb-ft (Nm) ............... 12-15 (16-20)
Crankshaft Rear Crank Seal Carrier Housing Shell Bolt, lb-ft (Nm) ............... 6-9 (8-12)
Front Timing Cover Crank Seal Support Face Bolt, lb-ft (Nm) ............... 6-9 (8-12)
Oil Pump Fluid Pickup Screen Support Bracket Bolt, lb-ft (Nm) ............... 14-21 (19-28)
Oil Pump Screen Tube Entry Base Inlet Joint Bolt, lb-ft (Nm) ............... 10-13 (14-18)
Water Pump Pulley Fan Belt Hub Assembly Bolt, lb-ft (Nm) ............... 15-22 (20-30)
Crankshaft Position Hall Effect Timing Sensor Bolt, lb-ft (Nm) ............... 7-10 (9-14)
Camshaft Position Phase Reference Sensor Bolt, lb-ft (Nm) ............... 7-10 (9-14)
Engine Coolant Temp Signal Processing Switch Sensor, lb-ft (Nm) ............... 12-15 (16-20)
Engine Oil Pressure Signal Processing Warning Sensor, lb-ft (Nm) ............... 8-12 (11-16)
Engine Detonation Structural Knock Control Sensor Bolt, lb-ft (Nm) ............... 12-15 (16-20)
Oxygen Sensor Threaded Exhaust Boss Fixing Shell, lb-ft (Nm) ............... 26-34 (35-46)
Engine Steel Lifting Rig Eye Bracket Retaining Fastener, lb-ft (Nm) ............... 25-35 (34-47)
Governor Structural Assembly Unit Frame Retaining Bolt, lb-ft (Nm) ............... 14-21 (19-28)
Governor Control Lever Operational Pivot Adjustment Nut, lb-ft (Nm) ............... 4-7 (5-9)
Fuel Injector Fuel Assembly Pressurized Delivery Line Nut, lb-ft (Nm) ............... 18-22 (24-30)
Cylinder Head Core Expansion Frost Sealing Plugs, lb-ft (Nm) ............... 15-20 (20-27)
Cylinder Block Lateral Water Jacket Drain Screw Plug, lb-ft (Nm) ............... 12-18 (16-24)
Crankshaft Auxiliary Gear Drive Locking Face Bolt, lb-ft (Nm) ............... 28-35 (38-47)
Engine Crankcase Lower Rear Cover Sealing Plate Screw, lb-ft (Nm) ............... 6-9 (8-12)
Intake Manifold Upper To Lower Plenum Connecting Bolt, lb-ft (Nm) ............... 12-18 (16-24)
EGR Valve Assembly Exhaust Gas Flange Bolt, lb-ft (Nm) ............... 14-21 (19-28)
Fuel Pressure Regulator Body Attachment Screw Bolt, lb-ft (Nm) ............... 3-5 (4-7)
Idle Air Control Solenoid Base Mount Retaining Screw, lb-ft (Nm) ............... 6-9 (8-12)
Throttle Position Sensor Electrical Body Holding Screw, lb-ft (Nm) ............... 2-4 (3-5)
Manifold Absolute Pressure Sensor Support Shell Bolt, lb-ft (Nm) ............... 4-6 (5-8)
Ignition Control Module Solid State Back Plate Bolt, lb-ft (Nm) ............... 6-9 (8-12)
Crankcase PCV Valve Separator Metal Oil Deflector Bolt, lb-ft (Nm) ............... 7-10 (9-14)
Accessory Bracket Structural Support Cast Iron Plate Bolt, lb-ft (Nm) ............... 30-40 (41-54)
Coolant Outlet Elbow Thermostat Housing Base Stud, lb-ft (Nm) ............... 12-15 (16-20)
Oil Filter Adapter Housing Mounting Core Center Bolt, lb-ft (Nm) ............... 25-35 (34-47)
Flywheel Housing Access Inspection Lower Cover Plate Bolt, lb-ft (Nm) ............... 6-9 (8-12)
Clutch Pressure Plate Cover Outer Flywheel Friction Bolt, lb-ft (Nm) ............... 15-22 (20-30)
Timing Belt Tensioner Spring Anchor Structural Pivot Post, lb-ft (Nm) ............... 35-45 (47-61)
Camshaft Auxiliary Drive Shaft Outer Cover Face Plate Bolt, lb-ft (Nm) ............... 6-9 (8-12)
Exhaust Pipe Collector To Exhaust Manifold Stud Joint Nut, lb-ft (Nm) ............... 25-35 (34-47)
Air Intake Plenum Support Brace Frame Compression Bolt, lb-ft (Nm) ............... 15-22 (20-30)

________________________________________________________________________________________

• Ford Engines Specs
  
• Ford DSG-423 Specs
  
• Ford LRG-425 Specs
  
• Ford LRG-423 Specs
  
• Ford LSG-423 Specs
  

______________________________________________________________________________________

________________________________________________________________________________________

_______________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________