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Ford LSG-875 Engine

The Ford LSG-875 is a 7.54 L 8-cylinder natural aspiration engine rated at 1800 rpm, producing up to 94 kW. It powers generator sets from Ford, Kohler, Olympian and Spectrum, including the ENA, ENB, 100 RZ and 50-70 RZ. It holds 7.6 L (2.0 gal) of oil and 15.1 L (4.0 gal) of coolant.

Also known as: Ford LSG-875, LSG-875

Part of the Ford LSG875 engine family — 3 variants share parts & fitment.

7.538 L
Displacement
8
Cylinders
1800 rpm
Rated speed
94 kW
Gross power
On this pageSpecsGenerator setsMaintenanceFAQTorque & specsFluidsProceduresWiring

Engine specifications

Oil capacity7.6 L
Coolant capacity15.1 L
Displacement7.538 L
Cylinders8
AspirationNatural Aspiration
Rated speed1800 rpm
Gross power94 kW

Common problems

15
  • The FAULT 1 or FAULT 2 fault lamp lights. Engine shuts down immediately, engine runs for several seconds and then shuts down, or engine continues to run FAULT 1
    Cause: The standard undesignated fault functions are programmed to shut down the set when a fault is sensed. Fault 1 is time delayed while Fault 2 is immediate. The nature of the fault is an optional selection that is determined when the set installation is designed. The undesignated fault functions may also be programmed for non-shutdown or non-time delay
  • SWITCH OFF lamp flashes
    Cause: Indicates Run/Stop/Remote switch is in the Stop position which will prevent automatic starting if an automatic transfer switch is used
    Fix: Move the Run/Stop/Remote switch to the Remote position for automatic starting
  • PRE LO OIL PRES lamp lights. Engine continues to operate. PRE LO OIL PRES
    Fix: Indicates engine oil pressure has dropped to 30 psi (207 kPa). If generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow step 5 procedure. If engine can be stopped, follow procedures in step 5.
  • PRE LO OIL PRES lamp lights. Engine continues to operate
    Cause: Indicates engine oil pressure has dropped to 30 psi (207 kPa)
    Fix: If generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow step 5 procedure; if engine can be stopped, follow procedures in step 5
  • PRE HI ENGINE TEMP lamp lights. Engine continues to operate. PRE HI ENGINE TEMP
    Fix: Indicates engine has begun to overheat and engine temperature has risen to approximately 205° F (97° C). If generator is powering non-critical and critical loads and cannot be shut down, use the following: a. Reduce load if possible by turning off non-critical loads. b. Check air inlets and outlets and remove any obstructions to airflow. If engine can be stopped, follow procedure in step 3.
  • PRE HI ENGINE TEMP lamp lights. Engine continues to operate
    Cause: Indicates engine has begun to overheat and engine temperature has risen to approximately 205° F (97° C)
    Fix: If generator is powering non-critical and critical loads and cannot be shut down: reduce load if possible by turning off non-critical loads; check air inlets and outlets and remove any obstructions to airflow. If engine can be stopped, follow procedure in step 3
  • OVERCRANK lamp lights and engine stops cranking
    Cause: Indicates possible fuel or ignition system problem
    Fix: Check for empty fuel tank, fuel leaks, or plugged fuel lines and correct as required; check for dirty fuel filter and replace if necessary (see MAINTENANCE section); check for dirty or plugged air filter and replace if necessary (see MAINTENANCE section); check ignition system (see MAINTENANCE); reset the control and restart after correcting the problem; contact an authorized service center for service if none of the above
  • No AC output voltage
    Cause: Field breaker is tripped
    Fix: Reset breaker; contact an authorized service center if voltage buildup causes breaker to trip
  • LO OIL PRES lamp lights. Engine shuts down. LO OIL PRES
    Fix: Indicates engine oil pressure has dropped to 25 psi (172 kPa). Check oil level and filters. If oil system is OK but oil level is low, replenish. Reset control and restart. Contact an authorized service center if oil pressure is not in the range of 40 to 65psi (275 to 448 kPa).
  • LO OIL PRES lamp lights. Engine shuts down
    Cause: Indicates engine oil pressure has dropped to 25 psi (172 kPa)
    Fix: Check oil level and filters; if oil system is OK but oil level is low, replenish; reset control and restart; contact an authorized service center if oil pressure is not in the range of 40 to 65 psi (275 to 448 kPa)
  • LO FUEL LAMP lights. Engine shuts down and LO OIL PRES lamp lights. LO FUEL LAMP
    Fix: Indicates engine has run out of fuel. Check fuel level and replenish as required.
  • LO FUEL LAMP lights. Engine shuts down and LO OIL PRES lamp lights
    Cause: Indicates engine has run out of fuel
    Fix: Check fuel level and replenish as required
  • LO FUEL lamp lights. Engine continues to run. LO FUEL
    Fix: Indicates gasoline fuel supply is running low. Check fuel supply and replenish as required.
  • LO FUEL lamp lights. Engine continues to run
    Cause: Indicates gasoline fuel supply is running low
    Fix: Check fuel supply and replenish as required
  • LO ENG TEMP lamp lights. Set is in standby mode but is not operating
    Cause: Indicates engine coolant heater is not operating or is not circulating coolant
    Fix: Check for the following conditions: coolant heater not connected to power supply — check for blown fuse or disconnected heater cord and correct as required; check for low coolant level and replenish if required, look for possible coolant leakage points and repair as required; contact an authorized service center if none of the above

Compiled from service & troubleshooting documentation across every generator set that uses the Ford LSG-875.

Maintenance schedule

ItemSpecCapacityPart #Interval
Air filterEngine Air Cleaner—69 hr
Fuel filter—
Oil filterEngine Oil Filters—69 hr
Battery—
BeltEngine Drive Belts—69 hr
Coolant28.8—
Oil9.0—
Spark plugEngine Spark Plugs—69 hr

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Service specifications

36
TypeItemValueUnitCondition
ClearanceRotor bearing outer race to end bracket measurement1/4in.(6 mm)
GapSpeed sensor air gap0.020in.(0.508 mm)
OtherFrequency regulation, no load to full loadIsochronous
OtherFrequency regulation, steady state0.5%
OtherInsulation strip length per lead1/4in.(6 mm)
OtherOne-step load acceptance100% of Rating
OtherPhoto transistor board lead strip length (gray insulator jacket)2-3in.(50-75 mm)
OtherPiston Speed19.3ft/sec
OtherShort-circuit current300% of rated currentfor up to 10 seconds
OtherUnbalanced load capability100% of Rated Standby Current
OtherWaveform Distortion (THD)less than 1.8%no load to full load
PressureMax. restriction of cooling air, intake and discharge side of radiator0.5 (0.125)in. H2O (kPa)
PressureMaximum Air Cleaner Restriction15in H2O
PressureMaximum Allowable Exhaust Backpressure2.0in Hg
PressureMaximum allowable back pressure2.0 (6.8)in. Hg (kPa)exhaust
PressureNatural gas/LPG fuel supply pressure4--6 (7--11)oz./in.2 (in. H2O)
SpeedFrequency±0.25%for constant load, no load to full load
SpeedOverspeed Capability125%
SpeedPiston speed1155 (5.86)ft./min. (m/sec.)60 Hz
SpeedPiston speed962 (4.88)ft./min. (m/sec.)50 Hz
SpeedRated rpm1500rpm50 Hz
SpeedRated rpm1800rpm60 Hz
TemperatureAmbient temperature (high ambient radiator system)122 (50)F (C)
TemperatureAmbient temperature (standard radiator)115 (46)F (C)
TemperatureExhaust temperature at rated kW, dry exhaust1100 (593)F (C)60 Hz
TemperatureMaximum Ambient Temperature (standard)110°F
TemperatureMinimum Temperature to Engine169°F
TemperatureTemperature Rise Across Engine15°F
TorqueDrive disc mounting bolts50ft. lbs.(67.8 Nm)
TorqueFan bolts260in. lbs.(29.4 Nm)
TorquePhoto transistor board mounting screws10in. lbs.maximum (1.1 Nm)
TorqueSCR terminal connections8in. lbs.maximum (0.9 Nm)
VoltageBattery charging alternator12V DC37 ampere rating
VoltageStarter motor rated voltage (DC)12V
VoltageVoltage Regulation±0.5%at steady state from no load to full load
VoltageVoltage regulation, no load to full load2%

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Recommended fluids

FluidGradeStandardAmbientCapacityNotes
Coolant-30FLevel Good
Engine oilAPI CD 15W-40API CD8.5 LTotal oil capacity; oil pan capacity 2.0 U.S. gal (7.6 L)
FuelLP Gas or Natural Gas VaporFuel supply line inlet 1 NPTF; natural gas/LPG fuel supply pressure 4-6 oz./in.2 (7-11 in. H2O)

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

5
Generator Check List maintenance
  1. Check coolant level and record freeze protection: Level Good -30F.
  2. Visual inspection of radiator: No visible issues or performance issues.
  3. Visual inspection of radiator hoses: No visible issues.
  4. Check condition of coolant hoses: Good Condition.
  5. Check condition of fuel hoses: No visible issues.
  6. Check condition of engine belts: FAIR Condition.
  7. Genset has battery charger: 120VAC/12VDC/10A.
  8. Genset has coolant heater: 120VAC/1500W.
  9. Check engine oil level: Oil level is full.
  10. Engine oil filters last changed date and HRS: 1-25-21.
  11. Inspect exhaust system for cracks / leaks: Exhaust flex is cracked.
  12. Generator end is 12 lead reconnectable: YES.
  13. Generator end has PMG permanent magnet generator: AREP.
Generator Disassembly repair

Tools: hoist, lifting eyes, wood blocks, wrenches

  1. Disconnect controller-to-engine and engine-to-generator harnesses and wiring.
  2. Remove bolts from generator vibro-mounts.
  3. Suspend generator at both ends with hooks in lifting eyes.
  4. Place wood blocks under flywheel housing; lower generator end onto blocks.
  5. Remove fan guard; remove bolts holding adapter to flywheel housing.
  6. Remove nuts and spacers holding drive discs to flywheel.
  7. Work drive discs over studs to separate generator from engine.
  8. Set generator on floor horizontally; remove drive discs and fan.
Generator Reassembly repair

Tools: hoist, torque wrench, wrenches

  1. Install new tolerance ring in end bracket.
  2. Suspend rotor over generator; lower rotor field into stator.
  3. Align rotor bearing into end bracket tolerance ring.
  4. Place fan over rotor flange and torque bolts.
  5. Fasten drive discs to rotor shaft and torque bolts.
  6. Attach hoist to end bracket and adapter eye; raise generator horizontally.
  7. Align studs with drive discs; install spacers; fasten adapter to flywheel housing.
  8. Install fan guard; replace LED board, speed sensor, junction box, controller; reconnect systems.
Prior to Disassembly repair

⚠ Unit starts without notice; turn Master Switch off and remove battery cables.

⚠ Electrical shock from battery; remove jewelry.

⚠ Hot piping; allow unit to cool.

Tools: battery tools, fuel containers

  1. Disconnect starting batteries, negative lead first; remove from work area.
  2. Disconnect AC accessories: battery charger, block heater, fuel transfer pump.
  3. Shut off fuel supply and drain fuel into proper containers.
  4. Ventilate work area to clear fumes.
  5. Disconnect fuel, cooling, and exhaust systems as necessary to tilt generator.
  6. Disconnect output leads or load circuit cables at generator.
  7. Check generator weight on nameplate; verify lifting equipment rated.
Rotor Replacement repair

Tools: hoist, lifting eye, screwdriver, wire stripper, crimp tool, torque wrench

  1. Fasten lifting eye and hoist hook to rotor flange.
  2. Hoist rotor carefully to avoid damaging exciter field magnets.
  3. Remove screws securing photo transistor board; retain screws.
  4. Install new photo transistor board; route lead through rotor shaft.
  5. Attach board, insulator, washers, and actuator cup with retained screws.
  6. Cut excess lead; strip gray jacket 2-3 in.; strip 1/4 in. insulation; crimp terminals.
  7. Secure leads to rotor shaft with tie wrap.
  8. Connect red to F+ stud, green to G stud, white to AC, black to other AC.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Voltage reconnection

VoltagePhaseConnectionLeadsNotes
FR Activator wiringRed wire to SCR F+ stud; Green wire to G stud; White wire to any AC stud; Black wire to other AC studMaximum torque on SCR terminals 8 in. lbs. (0.9 Nm).
110/220112 reconnectable leads
115/230112 reconnectable leads
120/208312 reconnectable leads
120/240112 reconnectable leads
120/240312 reconnectable leads
127/220312 reconnectable leads
266/460312 reconnectable leads
277/480312 reconnectable leads
347/600312 reconnectable leads

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Parts cataloged across the Ford LSG875 family

56
Part #DescriptionCategory
952-696GasketGasket
276206Hose, moldedHose
X-309-16Clamp, hoseHose
X-380-1Connector, 1/8NPT x 1/4 in. ID hoseHose
X-386-56Fuel line, flexibleHose
X-577-6Hose, 5/8 ID x 11Hose
X-797-1Hose, flexHose
X-797-11Hose, flexHose
X-797-2Hose, flexHose
276378Installed Block Heater Kit / Interim Kit (120V)Service part / kit
276379Installed Block Heater Kit / Interim Kit (240V)Service part / kit
276691Block HeaterService part / kit
276692Block HeaterService part / kit
285054Silencer Residential R-M (Table 3)Service part / kit
285086Silencer Industrial I-N (Table 3)Service part / kit
285127Silencer Industrial I-N (Table 1)Service part / kit
285775Silencer Residential R-M (Table 1)Service part / kit
286788Silencer Critical C-BM (Table 1)Service part / kit
290483Silencer Residential R-BM (Table 1)Service part / kit
290484Silencer Residential R-N (Table 1)Service part / kit
290485Silencer Residential R-BM (Table 3)Service part / kit
290486Silencer Residential R-N (Table 3)Service part / kit
290489Silencer Critical C-M (Table 3)Service part / kit
290490Silencer Critical C-N (Table 3)Service part / kit
290495Silencer Critical C-M (Table 1)Service part / kit
290496Silencer Critical C-N (Table 1)Service part / kit
326174Installed Block Heater Kit (120V)Service part / kit
326175Installed Block Heater Kit (240V)Service part / kit
326234Block HeaterService part / kit
326235Block HeaterService part / kit
326279Changeover KitService part / kit
326280Changeover KitService part / kit
952-048Pipe Plug 3/8 - 18 x .42 socket hexService part / kit
952-234Bolt - 5/16 - 18 x .875Service part / kit
952-486Dowel - 1/2 x 1.00Service part / kit
952-539Bolt - 5/16 - 18 x 2.00Service part / kit
952-553Plug - Oil Passage In Block - 1/4 NPTService part / kit
952-554Plug - Water Drain - 1/4 NPT - BrassService part / kit
952-556DowelService part / kit
952-561Plug - .060 O/SService part / kit
952-563Plug - 5/8 - 18Service part / kit
952-569Plug - Camshaft Rear Bearing - StandardService part / kit
952-570Plug - Camshaft Rear Bearing - .060 O/SService part / kit
952-577PointerService part / kit
952-596Plug - 1.50 CupService part / kit
952-688CoverService part / kit
952-689BlockService part / kit
DZAE-6730-AAoil pan drain plugService part / kit
E5AE-6730-AAmetric drain plugService part / kit
C20E-6734-Aold drain plug sealSeal
EQEE-6734-AAmetric drain plug sealSeal
ESAE-6734-AAdrain plug sealSeal
241481Switch, high temperature 268298 Sender, water temperatureSensor
255264Switch, low water temperatureSensor
255913Switch, pressureSensor
271425Switch, anticipatory low oil pressureSensor

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Common questions

What is the oil capacity of the Ford LSG-875?

The Ford LSG-875 engine has an oil capacity of 7.6 liters.

What is the displacement of the Ford LSG-875?

The Ford LSG-875 has a displacement of 7.538 liters with 8 cylinders.

Which generators use the Ford LSG-875 engine?

The Ford LSG-875 powers 14 generator set(s), including Ford ENA, Ford ENB, Kohler 100 RZ, Kohler 50-70 RZ, Kohler 60 RZ.

What is a common problem with the Ford LSG-875 engine?

A commonly reported issue on generators using the Ford LSG-875 is: The FAULT 1 or FAULT 2 fault lamp lights. Engine shuts down immediately, engine runs for several seconds and then shuts down, or engine continues to run. Cause: The standard undesignated fault functions are programmed to shut down the set when a fault is sensed. Fault 1 is time delayed while Fault 2 is immediate. The nature of the fault is an optional selection that is determined when the set installation is designed. The undesignated fault functions may also be programmed for non-shutdown or non-time delay.