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Ford LRG-423 Engine

General Technical Data

Engine Specifications

Engine Model ............... Ford LRG-423
Engine Type ............... 4-cycle inline 4-cylinder overhead cam liquid-cooled industrial gasoline
Number of Cylinders ............... 4
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 3.78 (96.0)
Engine Stroke, in (mm) ............... 3.13 (79.4)
Displacement, cu.in (L) ............... 140 (2.3)
Rated Engine Power, hp (kW) ............... 63 (47) at 2800 rpm
Rated Engine Speed, rpm ............... 1800-2800
Peak Torque ............... 115 lb-ft (156 Nm) at 1800 rpm
Idle Speed ............... 900-1000 rpm
Operating Speed ............... 2200 rpm
Max Continuous Speed, rpm ............... 2800
Max Intermittent Speed, rpm ............... 3000
Compression Ratio ............... 9.0:1
Firing Order ............... 1-3-4-2
Cylinder Block Type ............... Cast iron
Cylinder Head Type ............... Cast iron
Lubrication System ............... Full-pressure
Oil Pump Type ............... Rotor type, belt-driven
Oil Filter Type ............... Full-flow, spin-on
Cooling System ............... Liquid-cooled
Water Pump Type ............... Belt-driven, centrifugal
Air Cleaner Type ............... Dry dual-stage
Starting System ............... Electric Starter
Electrical System ............... 12V
Alternator Rating ............... 40A

Fuel System

Fuel Type ............... Gasoline or Dual Fuel LPG
Carburetor Type ............... Single barrel down-draft
Fuel Pump Type ............... Mechanical diaphragm or Electric
Fuel Pump Pressure, psi (kPa) ............... 4.0-6.0 (27.6-41.4)
Fuel Filter Type ............... Inline disposable spin-on
Governor Type ............... Electronic or Mechanical velocity
LPG Regulator Type ............... Two-stage converter converter
Idle Mixture Adjustment ............... Needle valve manual control
Main Jet Size ............... Fixed orifice standard altitude
Choke Type ............... Electric thermostatic coil

Dimensions and Weight

Engine Length, in (mm) ............... 26.5 (675)
Engine Width, in (mm) ............... 22.3 (565)
Engine Height, in (mm) ............... 25.8 (655)
Dry Engine Weight, lbs (kg) ............... 295 (134)

Maintenance Data

Service Information

Compression Pressure, Minimum, psi (kPa) ............... 135 (931)
Oil Pressure at 2000 rpm, psi (kPa) ............... 40-60 (275.8-413.7)
Oil Pressure at Low Idle, psi (kPa) ............... 15 (103.4)
Normal Operating Temperature, F (C) ............... 180-200 (82.2-93.3)
Thermostat Opening Temperature, F (C) ............... 192 (88.9)
Thermostat Full Open Temperature, F (C) ............... 212 (100.0)
Radiator Cap Pressure Rating, psi (kPa) ............... 13 (89.6)
Spark Plug Type ............... Motorcraft AWSF-52-C
Spark Plug Gap, in (mm) ............... 0.044 (1.12)
Ignition Timing, deg BTDC ............... 10 at 1000 rpm
Distributor Air Gap, in (mm) ............... 0.010 (0.254)

Engine Oil and Coolant

Engine Oil Type .................. SAE 5W-30, SAE 10W-30
API Service Classifications ......................... SG, SH, or SJ
Crankcase Oil Capacity with Filter, 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 (96.012-96.063)
Cylinder Bore Out of Round Maximum, in (mm) ............... 0.001 (0.025)
Cylinder Bore Taper Maximum, in (mm) ............... 0.001 (0.025)
Main Bearing Journal Diameter, in (mm) ............... 2.398-2.399 (60.912-60.937)
Main Bearing Oil Clearance, in (mm) ............... 0.0008-0.0026 (0.020-0.066)
Connecting Rod Journal Diameter, in (mm) ............... 2.046-2.047 (51.979-52.004)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0008-0.0026 (0.020-0.066)
Crankshaft End Play, in (mm) ............... 0.004-0.008 (0.102-0.203)
Connecting Rod Big End Bore I.D, in (mm) ............... 2.172-2.173 (55.169-55.194)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0014-0.0022 (0.036-0.056)
Piston Pin Diameter, in (mm) ............... 0.9122-0.9125 (23.170-23.178)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0003-0.0005 (0.008-0.013)
Top Ring Side Clearance, in (mm) ............... 0.002-0.004 (0.051-0.102)
Second Ring Side Clearance, in (mm) ............... 0.002-0.004 (0.051-0.102)
Top Ring End Gap, in (mm) ............... 0.010-0.020 (0.254-0.508)
Second Ring End Gap, in (mm) ............... 0.012-0.022 (0.305-0.559)
Oil Ring End Gap, in (mm) ............... 0.015-0.035 (0.381-0.889)
Cylinder Head Surface Flatness, in (mm) ............... 0.003 (0.076)
Cylinder Block Top Surface Flatness, in (mm) ............... 0.005 (0.127)
Intake Valve Stem Diameter, in (mm) ............... 0.316-0.317 (8.026-8.052)
Exhaust Valve Stem Diameter, in (mm) ............... 0.315-0.316 (8.001-8.026)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0010-0.0027 (0.025-0.069)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0015-0.0032 (0.038-0.081)
Valve Guide Bore Inner Diameter, in (mm) ............... 0.318-0.319 (8.077-8.103)
Valve Face Angle, deg ............... 45
Valve Seat Angle, deg ............... 45
Valve Seat Runout Maximum, in (mm) ............... 0.002 (0.051)
Valve Spring Free Length, in (mm) ............... 1.91 (48.51)
Camshaft Journal Diameter, in (mm) ............... 1.771-1.772 (44.983-45.009)
Camshaft Journal Bearing Clearance, in (mm) ............... 0.001-0.003 (0.025-0.076)
Cam Lobe (Lift Intake), in (mm) ............... 0.238 (6.045)
Cam Lobe (Lift Exhaust), in (mm) ............... 0.248 (6.299)

Tightening Torques

Cylinder Head Bolts (Step One), lb-ft (Nm) ............... 50 (67.8)
Cylinder Head Bolts (Step Two), lb-ft (Nm) ............... 70 (94.9)
Cylinder Head Bolts (Step Three), lb-ft (Nm) ............... 85 (115.2)
Main Bearing Cap Bolts, lb-ft (Nm) ............... 85-95 (115.2-128.8)
Connecting Rod Cap Nuts, lb-ft (Nm) ............... 40-45 (54.2-61.0)
Flywheel to Crankshaft Bolts, lb-ft (Nm) ............... 53-59 (71.9-80.0)
Camshaft Sprocket Bolt, lb-ft (Nm) ............... 50-65 (67.8-88.1)
Crankshaft Damper Pulley Bolt, lb-ft (Nm) ............... 100-120 (135.6-162.7)
Intake Manifold Fasteners, lb-ft (Nm) ............... 15-22 (20.3-29.8)
Exhaust Manifold Fasteners, lb-ft (Nm) ............... 15-22 (20.3-29.8)
Rocker Arm Shaft Support Bolts, lb-ft (Nm) ............... 15-22 (20.3-29.8)
Oil Pan Mounting Bolts, lb-in (Nm) ............... 100-140 (11.3-15.8)
Oil Pan Drain Plug, lb-ft (Nm) ............... 15-25 (20.3-33.9)
Oil Pump to Block Bolt, lb-ft (Nm) ............... 14-21 (19.0-28.5)
Water Pump Mounting Bolts, lb-ft (Nm) ............... 14-21 (19.0-28.5)
Spark Plugs Installation, lb-ft (Nm) ............... 15-20 (20.3-27.1)
Distributor Hold Down Bolt, lb-ft (Nm) ............... 14-18 (19.0-24.4)
Timing Belt Cover Screws, lb-in (Nm) ............... 60-90 (6.8-10.2)
Alternator Mounting Bracket Bolts, lb-ft (Nm) ............... 28-38 (38.0-51.5)
Starter Motor Mounting Bolts, lb-ft (Nm) ............... 15-20 (20.3-27.1)
Fuel Pump Mounting Bolts, lb-ft (Nm) ............... 14-21 (19.0-28.5)
Carburetor to Manifold Nuts, lb-ft (Nm) ............... 12-15 (16.3-20.3)
Valve Cover Fasteners, lb-in (Nm) ............... 60-90 (6.8-10.2)
Flywheel Housing Adaptor Bolts, lb-ft (Nm) ............... 40-50 (54.2-67.8)
Thermostat Housing Bolts, lb-ft (Nm) ............... 12-15 (16.3-20.3)

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

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