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Ford LSG-875 Engine

General Technical Data

Engine Specifications

Engine Model ............... Ford LSG-875
Engine Type ............... 4-cycle 90-degree V-cylinder OHV liquid-cooled industrial power unit
Number of Cylinders ............... 8
Cylinder Arrangement ............... V-configuration 90-degree angle
Engine Bore, in (mm) ............... 4.36 (110.7)
Engine Stroke, in (mm) ............... 3.85 (97.8)
Displacement, cu.in (L) ............... 460 (7.5)
Rated Engine Power, hp (kW) ............... 152-243 (113-181) at 2800-3600 rpm
Rated Engine Speed, rpm ............... 1800-3600
Peak Torque ............... 365-385 lb-ft (495-522 Nm) at 1800-2200 rpm
Idle Speed ............... 650-750 rpm
Operating Speed ............... 1800 rpm or 3600 rpm
Compression Ratio ............... 8.0:1 or 8.5:1 configuration variations
Firing Order ............... 1-5-4-2-6-3-7-8
Cylinder Block Type ............... Heavy duty cast iron alloy internal casting
Cylinder Head Type ............... Heavy duty cast iron structural assembly containing stellite valves
Lubrication System ............... Full-pressure internal fluid delivery bypass network
Oil Pump Type ............... Crankshaft rotor style gear-driven assembly unit
Oil Filter Type ............... Full-flow spin-on cartridge filtration unit
Cooling System ............... Liquid-cooled high-capacity thermal exchange design
Water Pump Type ............... Front auxiliary belt-driven centrifugal system impeller
Air Cleaner Type ............... Heavy-duty industrial dry element dual-stage canister
Ignition Type ............... Breakerless, solid-state electronic ignition distributor mechanism
Starting System ............... Electric starter motor actuation
Electrical System ............... 12V positive engagement direct current framework
Alternator Charging ............... 40-60A

Fuel System

Fuel Types ............... Gasoline or liquefied petroleum gas or natural gas alternatives
Carburetor Manufacturer ............... Zenith or IMPCO dry fuel conversion devices
Induction Strategy ............... Single down-draft industrial induction device or gas mixer system
Fuel Delivery Pressure, psi (kPa) ............... 4.5-6.5 (31-45)
LPG Mixer Type ............... Diaphragm-actuated variable-venturi dry fuel mixer layout
Natural Gas Inlet Pressure, in.H2O (kPa) ............... 4.0-6.0 (1.0-1.5)
Governor System Manufacturer ............... Hoof or Barber-Colman velocity or electronic control options
Governor Speed Regulation, percent ............... 3-5 electronic precision isochronous control limits
Fuel Shutoff Valve Type ............... 12V electromagnetic safety lock-off mechanism
Venturi Diameter, in (mm) ............... 1.50 (38.1)
Choke Control Mechanism ............... Automatic thermal spring or remote electrical solenoid actuation
Manifold Configuration ............... Cast iron dual-plane heated fuel distribution routing

Dimensions and Weight

Overall Length, in (mm) ............... 34.8 (885)
Overall Width, in (mm) ............... 29.5 (750)
Overall Height, in (mm) ............... 32.1 (815)
Dry Weight, lbs (kg) ............... 725 (329)

Maintenance Data

Service Information

Compression Pressure, Minimum, psi (kPa) ............... 130 (896)
Normal Oil Pressure, psi (kPa) ............... 40-60 (276-414)
Minimum Oil Pressure at Idle, psi (kPa) ............... 15 (103)
Normal Cooling Operating Temperature, F (C) ............... 180-195 (82-90)
Spark Plug Type ............... Motorcraft ASF-42 or equivalent
Spark Plug Gap, in (mm) ............... 0.032-0.036 (0.81-0.91)
Ignition Timing, deg BTDC ............... 6-10

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, SAE 20W-20
API Service Classifications ......................... SF or SG
Engine Oil Capacity with Filter, qt (L) ............... 7.0-8.0 (6.6-7.6)
Cooling System Capacity, qt (L) ............... 22.0 (20.8)

Service Intervals

Change engine oil ............... Every 100 hours
Replace oil filter ............... Every 100 hours
Replace fuel filter ............... Every 250 hours
Inspect air filter ............... Every 50 hours
Replace air filter ............... Every 250 hours
Change coolant ............... Every 1000 hours
Valve-lash adjustment ............... Every 500 hours
Check fuel system ............... Every 500 hours
Replace spark plug ............... Every 500 hours
Compression test ............... Every 500 hours
Belt inspection ............... Every 100 hours

Service Specifications

Cylinder Bore Inside Diameter, in (mm) ............... 4.360-4.364 (110.74-110.85)
Cylinder Bore Out of Round, in (mm) ............... 0.0015 (0.038)
Cylinder Bore Taper Limit, in (mm) ............... 0.0010 (0.025)
Main Bearing Journal Diameter, in (mm) ............... 2.999-3.000 (76.17-76.20)
Main Bearing Oil Clearance, in (mm) ............... 0.0008-0.0026 (0.020-0.066)
Connecting Rod Journal Diameter, in (mm) ............... 2.499-2.500 (63.47-63.50)
Connecting Rod Oil Clearance, in (mm) ............... 0.0008-0.0026 (0.020-0.066)
Crankshaft End Play, in (mm) ............... 0.004-0.008 (0.10-0.20)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0014-0.0022 (0.036-0.056)
Piston Pin Bore Inside Diameter, in (mm) ............... 1.0401-1.0405 (26.419-26.429)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0002-0.0004 (0.005-0.010)
Top Ring End Gap, in (mm) ............... 0.015-0.025 (0.38-0.64)
Second Ring End Gap, in (mm) ............... 0.015-0.025 (0.38-0.64)
Oil Ring End Gap, in (mm) ............... 0.015-0.055 (0.38-1.40)
Top Ring Side Clearance, in (mm) ............... 0.002-0.004 (0.05-0.10)
Second Ring Side Clearance, in (mm) ............... 0.002-0.004 (0.05-0.10)
Oil Ring Side Clearance, in (mm) ............... 0.002-0.004 (0.05-0.10)
Cylinder Head Flatness Maximum, in (mm) ............... 0.0030 (0.076)
Cylinder Block Deck Flatness, in (mm) ............... 0.0030 (0.076)
Intake Valve Stem Outside Diameter, in (mm) ............... 0.341-0.342 (8.66-8.69)
Exhaust Valve Stem Outside Diameter, in (mm) ............... 0.340-0.341 (8.64-8.66)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0010-0.0024 (0.025-0.061)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0015-0.0030 (0.038-0.076)
Valve Face Angle, deg ............... 44.5
Valve Seat Angle, deg ............... 45
Valve Guide Inside Diameter, in (mm) ............... 0.343-0.344 (8.71-8.74)
Valve Spring Free Length, in (mm) ............... 2.110 (53.59)
Camshaft Journal Diameter, in (mm) ............... 2.249-2.250 (57.12-57.15)
Camshaft Journal Clearance, in (mm) ............... 0.001-0.003 (0.025-0.076)
Camshaft End Play, in (mm) ............... 0.002-0.006 (0.05-0.15)

Tightening Torques

Cylinder Head Bolts (Step 1), lb-ft (Nm) ............... 80 (108)
Cylinder Head Bolts (Step 2), lb-ft (Nm) ............... 110 (149)
Cylinder Head Bolts (Step 3), lb-ft (Nm) ............... 140 (190)
Main Bearing Cap Bolts, lb-ft (Nm) ............... 95-105 (129-142)
Connecting Rod Cap Nuts, lb-ft (Nm) ............... 40-45 (54-61)
Flywheel to Crankshaft Bolts, lb-ft (Nm) ............... 75-85 (102-115)
Vibration Damper to Crankshaft Bolt, lb-ft (Nm) ............... 70-90 (95-122)
Intake Manifold Fasteners, lb-ft (Nm) ............... 25-35 (34-47)
Exhaust Manifold Fasteners, lb-ft (Nm) ............... 25-35 (34-47)
Rocker Arm Shaft Support Bolts, lb-ft (Nm) ............... 40-45 (54-61)
Oil Pump Assembly Retention Bolt, lb-ft (Nm) ............... 12-15 (16-20)
Oil Pan Drain Plug, lb-ft (Nm) ............... 15-25 (20-34)
Oil Pan Rail Screws, lb-ft (Nm) ............... 7-10 (10-14)
Timing Gear Cover Bolts, lb-ft (Nm) ............... 12-15 (16-20)
Spark Plug, lb-ft (Nm) ............... 15-20 (20-27)
Water Pump Assembly Screws, lb-ft (Nm) ............... 12-15 (16-20)
Distributor Clamp Bolt, lb-ft (Nm) ............... 12-15 (16-20)
Flywheel Housing to Block Bolts, lb-ft (Nm) ............... 40-50 (54-68)
Valve Cover Attachment Screws, lb-ft (Nm) ............... 7-10 (10-14)
Fuel Pump Mechanical Bolts, lb-ft (Nm) ............... 12-15 (16-20)
Thermostat Housing Attachment Screws, lb-ft (Nm) ............... 12-15 (16-20)
Governor Drive Housing Bolts, lb-ft (Nm) ............... 15-20 (20-27)
Alternator Pivot Adjustment Mounting Bolt, lb-ft (Nm) ............... 24-32 (33-43)
Crankshaft Pulley to Damper Screws, lb-ft (Nm) ............... 35-45 (47-61)
Camshaft Thrust Plate Retaining Bolts, lb-ft (Nm) ............... 9-12 (12-16)

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