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Ford LSG-875-6005A Engine

The Ford LSG-875-6005A is a 7.5 L 8-cylinder natural gas engine rated at 1800 rpm, producing up to 83.18 kW. It powers generator sets from Cummins/Onan, including the 75.0 ENT, ENTX and lsg-875. It holds 6.2 L (1.6 gal) of oil and 28 L (7.4 gal) of coolant.

Also known as: Modified Ford LSG-875-6005A

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

7.5 L

Displacement

Cylinders

1800 rpm

Rated speed

83 kW

Gross power

On this pageSpecs Generator sets Maintenance FAQ Torque & specs Procedures Wiring

Engine specifications

Oil capacity	6.2 L
Coolant capacity	28.0 L
Displacement	7.5 L
Cylinders	8
Aspiration	Natural Gas
Rated speed	1800 rpm
Gross power	83 kW

Generator sets powered by this engine

Cummins/Onan 75.0 ENTCummins/Onan ENTXCummins/Onan lsg-875

Common problems

Fault lamp lights and engine shuts down after running for a period
Cause: Oil level (engine will shut down if sensor is closed)
Fix: Check oil level.
Low oil pressure shutdown
Cause: Oil level
Fix: Check oil level; replenish if necessary.
High engine temperature shutdown
Cause: Coolant level
Fix: Check coolant level; replenish if necessary.
Engine will not crank
Cause: Fault lamp on
Fix: Correct fault and reset control
Overcrank fault lamp lights and engine stops cranking after approximately 75 seconds
Fix: See engine service manual for troubleshooting fuel system, ignition system, etc.; After correcting fault, reset engine monitor relay by placing Run-Stop/Reset-Remote switch to Stop/Reset position, depressing Reset button, then to the required running position.
Fault lamp lights, no fault exists
Fix: To check a no-fault condition, disconnect leads from TB11 terminals 29, 30 and 31; if fault lamp lights with leads disconnected, replace engine monitor board; reconnect leads.
Fault lamp lights immediately after engine starts
Cause: Overspeed condition as engine starts
Fix: Check for overspeed condition as engine starts.
Engine stops cranking and fault lamp lights, after cranking approximately 75 seconds
Fix: See engine service manual for troubleshooting fuel system, ignition system, etc.; After correcting problem, reset engine monitor relay by placing Run-Stop/Reset-Remote switch to Stop/Reset, then back to the required running position.
Engine runs, shuts down, cranks for 75 seconds, cranking cycle stops, overcrank light ON
Cause: Fuel supply or ignition fault
Fix: Check fuel supply; check ignition.
Engine runs, shuts down and cranks for 75 seconds; cranking cycle stops; fault lamp lights
Cause: Fuel supply or ignition system fault
Fix: Check fuel supply; check ignition system.
Emergency Stop 32A
Fix: Reset the emergency stop switch.
SWITCH OFF lamp flashes
Cause: Start/Stop/Remote switch is in the Stop position which will prevent automatic starting if an automatic transfer switch is used
Fix: Move the Start/Stop/Remote switch to the Remote position for automatic starting
Pre Low Oil Pressure 41
Fix: Check and adjust oil level or replace oil pump.
PRE LO OIL PRES lamp lights. Engine continues to operate
Cause: Engine oil pressure has dropped to 30 psi (207 kPa)
Fix: If engine can be stopped, follow procedures in step 5; if generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow step 5 procedure
Pre High Coolant Temp. 40

Compiled from service & troubleshooting documentation across every generator set that uses the Ford LSG-875-6005A.

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter			—	500 hr
Fuel filter			—	7 hr
Oil filter			—	500 hr
Battery			—	500 hr
Belt			M-1702	500 hr	Amazon eBay
Coolant	Coolant	28.0 L	—
Coolant filter			—
Oil		6.2	—	7 hr
Spark plug			—	1000 hr

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

Service specifications

Type	Item	Value	Unit	Condition
Gap	Speed sensor air gap	0.020	in. (0.508 mm)
Gap	Speed sensor air gap	0.36- 0.71	mm
Other	Exciter current delivery time (Fast-Response II)	0.05	seconds	change in load demand
Other	Overvoltage shutdown threshold	15% or more over nominal		shutdown after approximately one second
Pressure	Battery equalizer input voltage (24 volts nominal)	20- 35	volts
Pressure	Battery equalizer output voltage	(input voltage/2) ±2%	volts
Pressure	Low oil pressure shutdown (diesel models)	5.5 to 10.5	psi (38 to 72 kPa)
Pressure	Low oil pressure shutdown (gasoline models)	11.5 to 18.5	psi (79 to 126 kPa)
Pressure	Pressure switch 364345	483 ±14	kPa
Resistance	CR relay coil resistance	approximately 125	Ohms	12-Volt coil; measure between terminals A and B
Resistance	CR relay normally closed contacts (continuity)	1-7, 2-8, 3-9
Resistance	Exciter armature low resistance reading (faulty if below)	under 0.1-0.2	ohms
Resistance	Generator field F3-F4 continuity	2-3.75	ohms, +5%
Resistance	Photo transistor board reading (covered)	300K	ohms or higher	covered
Resistance	Photo transistor board reading (lit)	5K	ohms or lower	bright flashlight on board
Resistance	Pressure sender 264390 value A	240 +17/- 15	ohms at 0 psi
Resistance	Pressure sender 264390 value B	153 +12/- 15	ohms at 25 psi
Resistance	Pressure sender 264390 value C	33.5	ohms at 100 psi
Resistance	Pressure sender 365624 value A	241 ±16	ohms at 0 psi
Resistance	Pressure sender 365624 value B	152 ±13	ohms at 50 psi
Resistance	Pressure sender 365624 value C	33.5	ohms at 200 psi
Resistance	Temperature sender 226717 value A	123.8 +7.2/- 7.8	ohms at 90.6 C (195 F)
Resistance	Temperature sender 226717 value B	35.6 +3.4/- 3.6	ohms at 137.8 C (280 F)
Resistance	Temperature sender 226919 value A	942 ±22	ohms at 37.7 C (100 F)
Resistance	Temperature sender 226919 value B	35	ohms at 115.6 C (240 F)
Speed	Governed speed (50 Hz models)	1500	rpm
Speed	Governed speed (60 Hz models)	1800	rpm
Speed	Governor speed droop	3 Hz or 90 rpm		between no load and full load
Speed	No-load frequency (50 Hz operation)	53	Hz	no load
Speed	No-load frequency (60 Hz operation)	63	Hz	no load
Speed	Overspeed shutdown	70	Hz	60 Hz models
Speed	Overspeed shutdown (50 Hz sets)	60	Hz
Speed	Overspeed shutdown (60 Hz sets)	70	Hz
Temperature	Battery equalizer operating temperature	- 40 to 71	C (- 40 F to 160 F)
Temperature	Low water temperature start-up threshold	below 70	°F (21°C)	10-second start-up
Temperature	Temperature switch 241308	107 ±4	C (225 F ±7 F)	normally open to close on temp. rise
Temperature	Temperature switch 290090/GM51705	16 ±3	C (60 F ±5 F)	normally open to close on temp. fall
Torque	Drive disc mounting bolts	50	ft. lbs. (108.48 Nm)
Torque	FR Activator mounting screws	20-26	in. lbs. (2.8-2.8 Nm)
Torque	FR Activator terminal screws A and F	20-25	in. lbs. (2.3-2.8 Nm)
Torque	Fan bolts	260	in. lbs. (29.4 Nm)
Voltage	1CR relay test voltage at P5 pin 10 to ground	0.5 to 1.0	volts	on-crank cycle
Voltage	Battery high volts lamp setpoint (12-volt systems)	15	volts
Voltage	Battery high volts lamp setpoint (24-volt systems)	30	volts
Voltage	Battery low volts lamp setpoint (12-volt systems)	10	volts
Voltage	Battery low volts lamp setpoint (24-volt systems)	20	volts
Voltage	CR relay test voltage at P5 pin 9 to ground	0.5 to 1.0	volts	Generator Master Switch in TEST position
Voltage	High voltage test (exciter armature A1 or A2 to rotor shaft)	4,100	volts AC	not more than one second
Voltage	High voltage test (generator field F3 or F4 to shaft)	1,100	volts AC	not more than one second; do not repeat test
Voltage	LED board output at 3B(+) and 5B(-)	1-2	Volts DC	generator set running
Voltage	Speed sensor voltage, wire 2 (black) & 16 (white)	3- 6	volts DC
Voltage	Speed sensor voltage, wire 2 (black) & 24 (red)	8- 10	volts DC

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

Procedures

Bosch Electronic Governor Stability and Gain Adjustment adjustment

Check that the stability control is in its extreme counterclockwise position.
Start engine. Allow the governor to control the engine. If engine is unstable, turn the gain control counterclockwise until stability is obtained. Adjust speed screw to proper engine speed.
Turn the gain control clockwise until the engine becomes just unstable. Back the gain control slightly counterclockwise until the engine is again stable.
Turn the stability control clockwise until the engine becomes just unstable. Back the stability control slightly counterclockwise until the engine is again stable.

Diesel Mechanical Governor Frequency Adjustment adjustment

Tools: Frequency meter

Start the generator set, observe the frequency meter.
Loosen the fuel pump high speed screw locknut to make the adjustments.
To increase or decrease the frequency (at no load), rotate the screw clockwise or counterclockwise respectively.
Tighten the locknut.
Loaded droop frequency may alternately be adjusted to the operating frequency at full load.

Gas/Gasoline Mechanical Governor Speed and Sensitivity Adjustment adjustment

Tools: Hand tachometer, Frequency meter

With the set running at full or rated load, check speed with hand tachometer or frequency meter.
Loosen locking nut on speed adjusting screw; turn clockwise to increase speed (and frequency) or counterclockwise to decrease; lock nut at new setting.
For sensitivity, loosen the nut at bottom of adjusting eyebolt and tighten the top nut to draw the head of the eyebolt closer to the governor arm pivot point (more sensitive).
To make governor control less sensitive, loosen the top nut and tighten the bottom nut to move the head away from the pivot point.
Recheck speed after sensitivity adjustment since changing this will also affect speed.

Generator Frequency Change (60 Hz to 50 Hz) adjustment

Tools: Frequency meter

On Microcomputer equipped generators, snip the jumper indicated in Figure A1 to convert from 60 Hz to 50 Hz.
Check frequency meter for a no load reading of 63 Hz for 60 Hz operation and 53 Hz for 50 Hz operation.
If equipped with isochronous governor, check for 60 and 50 Hz operation at no load.
If no frequency meter, connect meter across VO and V7 on control board terminal strip (set must not be running while making connection).

High and Low Battery Voltage Indicator Adjustment adjustment

Tools: DC power supply

Move Generator Master Switch to AUTO position. SYSTEM READY lamp should go on.
Rotate potentiometers R42 (High Batt. Volts) and R25 (Low Batt. Volts) fully counterclockwise.
Set DC power supply at 10 volts (20 volts for 24-volt units). Slowly rotate pot R25 clockwise until BAT. LOW VOLTS lamp lights.
Set DC power supply at 15 volts (30 volts for 24-volt units). Slowly rotate pot R42 clockwise until BAT. HIGH VOLTS lamp lights.
Set DC power supply between 10 to 15 volts (20 to 30 volts for 24-volt units). SYSTEM READY lamp should be on.
Seal pots after settings have been established.

Overfrequency Adjustment (Over/Underfrequency Relay, Decision-Maker 3+) adjustment

Turn the overfrequency adjustment potentiometer fully clockwise (CW).
Place master switch in RUN to start the generator set.
Adjust governor per engine operation manual, engine service manual, or governor section of this manual.
Slowly turn overfrequency potentiometer counterclockwise (CCW) until the LED starts flashing; after about 10 seconds the set shuts down on auxiliary fault.
Place master switch to OFF/RESET to reset the controller.
Place master switch to RUN to start the generator set.
Readjust the governor to the desired frequency as required.
Place master switch to OFF/RESET to stop the generator set.

Overvoltage Feature Testing and Adjustment (Decision-Maker 3+) adjustment

⚠ Hazardous voltage. Moving parts. Will cause severe injury or death. Operate the generator set only when all guards and electrical enclosures are in place.

⚠ Disconnecting the electrical load. Hazardous voltage will cause severe injury or death.

Disconnect generator set from load by opening line circuit breaker or disconnecting and taping output leads.
Determine overvoltage shutdown value based on user requirement; factory setting is 15% above nominal line-to-neutral voltage.
Remove the controller cover.
Place master switch in RUN to start the generator set.
Observe AC voltmeter; turn voltage adjustment potentiometer CW until generator set shuts down.
If the shutdown point is correct, go to step 12; otherwise continue.
Turn controller circuit board R42 adjustment potentiometer fully CW.
Place master switch to OFF/RESET to reset; then to RUN to start.
Observe AC voltmeter while turning voltage adjustment potentiometer to desired overvoltage shutdown point.
Turn R42 adjustment potentiometer slowly CCW until the generator set shuts down.
Turn controller voltage adjustment potentiometer slightly CCW.
Place master switch OFF/RESET then RUN to start; adjust for correct voltage and phase.
Place master switch OFF/RESET to stop.
Disconnect battery negative lead first; reconnect generator set to load; reconnect battery negative lead last.

Reactive Droop Compensator Adjustment Procedure adjustment

Tools: Voltmeter, Wattmeter

Remove any load; start each generator set with master switch in RUN.
Set reactive droop compensator rheostat on generator set no. 1 to minimum CCW; record rpm/frequency and voltage at 1/4 load steps to full load.
Repeat for generator set no. 2.
Compare readings; adjust voltage within 1 volt and speed within 3 rpm (or 0.1 Hz) at each load step.
Check droop compensation on each unit with an inductive load 1/2 to full load.
Adjust rheostat to approximately 4% below rated voltage at full load.
Repeat for unit no. 2.

Reactive Droop Compensator Alternate Adjustment Procedure adjustment

Tools: Voltmeter

Turn reactive droop compensator rheostat on generator set no. 1 to minimum setting.
Remove controller cover; move voltage sensing lead from V7 to V9 at the AC fuse terminal block.
Remove any load connected to the generator set.
Start the generator set with master switch in RUN.
Use controller or remote voltage adjusting potentiometer to fine adjust voltage.
Apply resistive load (1.0 power factor) until reaching rated current.
Adjust reactive droop compensator rheostat to achieve a 4% droop in voltage.
Remove the resistive load and stop the generator set.
Return voltage sensing lead from V9 to V7 at the AC fuse terminal block.
Replace the controller cover and repeat for generator set no. 2.

Underfrequency Adjustment (Over/Underfrequency Relay, Decision-Maker 3+) adjustment

Turn underfrequency adjustment potentiometer fully clockwise (CW).
Place master switch in RUN to start the generator set.
Adjust governor per engine operation manual, engine service manual, or governor section of this manual.
Slowly turn underfrequency potentiometer counterclockwise (CCW) until LED starts flashing; after about 10 seconds the set shuts down on auxiliary fault.
Place master switch to OFF/RESET to reset the controller.
Place master switch to RUN to start the generator set.
Readjust the governor to the desired frequency as required.
Place master switch to OFF/RESET to stop the generator set.

2-Wire Low Water Level Sender Test diagnostic

⚠ Hot engine and exhaust system can cause severe injury or death. Do not work on the generator set until it cools.

⚠ Hazardous voltage. Moving parts. Will cause severe injury or death. Operate the generator set only when all guards and electrical enclosures are in place.

Tools: DC voltmeter

Measure DC voltage between lead 31A (+) and ground (- ) with sender submerged in coolant; voltmeter indicates approximately 12.5 VDC.
Measure DC voltage between lead 31A (+) and ground (- ) with sender removed from coolant for at least 5-15 seconds; voltmeter indicates a drop to approximately 7 VDC.

3-Wire Low Water Level Sender Test diagnostic

⚠ Hot engine and exhaust system can cause severe injury or death. Do not work on the generator set until it cools.

⚠ Hazardous voltage. Moving parts. Will cause severe injury or death.

Tools: Ohmmeter

Measure resistance between lead 31 and ground with sender submerged in coolant; ohmmeter indicates a high resistance reading.
Measure resistance between lead 31 and ground with sender removed from coolant for at least 5-15 seconds; ohmmeter indicates a low resistance reading.

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

Voltage	Phase	Connection	Notes
120/208 or 139/240	3-Phase	4-Wire Low Wye	60Hz, 120/208-Volt or 139/240-Volt 3-Phase, 4-Wire Low Wye; 50Hz, 120/208-Volt or 110/190-Volt 3-Phase, 4-Wire Low Wye
120/240	1-Phase	3-Wire	60Hz, 120/240-Volt, 1-Phase, 3-Wire; 50Hz, 110/220-Volt, 1-Phase, 3-Wire
120/240	3-Phase	4-Wire Delta	60Hz, 120/240-Volt, 3-Phase, 4-Wire, Delta; 50Hz, 110/220-Volt, 3-Phase, 4-Wire, Delta. CT3 - Not Used
277/480	3-Phase	4-Wire High Wye	60Hz, 277/480-Volt, 3-Phase, 4-Wire High Wye; 50Hz, 220/380-Volt, 3-Phase, 4-Wire High Wye

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

Part #	Description	Category
952-696	Gasket	Gasket
276206	Hose, molded	Hose
X-309-16	Clamp, hose	Hose
X-380-1	Connector, 1/8NPT x 1/4 in. ID hose	Hose
X-386-56	Fuel line, flexible	Hose
X-577-6	Hose, 5/8 ID x 11	Hose
X-797-1	Hose, flex	Hose
X-797-11	Hose, flex	Hose
X-797-2	Hose, flex	Hose
276378	Installed Block Heater Kit / Interim Kit (120V)	Service part / kit
276379	Installed Block Heater Kit / Interim Kit (240V)	Service part / kit
276691	Block Heater	Service part / kit
276692	Block Heater	Service part / kit
285054	Silencer Residential R-M (Table 3)	Service part / kit
285086	Silencer Industrial I-N (Table 3)	Service part / kit
285127	Silencer Industrial I-N (Table 1)	Service part / kit
285775	Silencer Residential R-M (Table 1)	Service part / kit
286788	Silencer Critical C-BM (Table 1)	Service part / kit
290483	Silencer Residential R-BM (Table 1)	Service part / kit
290484	Silencer Residential R-N (Table 1)	Service part / kit
290485	Silencer Residential R-BM (Table 3)	Service part / kit
290486	Silencer Residential R-N (Table 3)	Service part / kit
290489	Silencer Critical C-M (Table 3)	Service part / kit
290490	Silencer Critical C-N (Table 3)	Service part / kit
290495	Silencer Critical C-M (Table 1)	Service part / kit
290496	Silencer Critical C-N (Table 1)	Service part / kit
326174	Installed Block Heater Kit (120V)	Service part / kit
326175	Installed Block Heater Kit (240V)	Service part / kit
326234	Block Heater	Service part / kit
326235	Block Heater	Service part / kit
326279	Changeover Kit	Service part / kit
326280	Changeover Kit	Service part / kit
952-048	Pipe Plug 3/8 - 18 x .42 socket hex	Service part / kit
952-234	Bolt - 5/16 - 18 x .875	Service part / kit
952-486	Dowel - 1/2 x 1.00	Service part / kit
952-539	Bolt - 5/16 - 18 x 2.00	Service part / kit
952-553	Plug - Oil Passage In Block - 1/4 NPT	Service part / kit
952-554	Plug - Water Drain - 1/4 NPT - Brass	Service part / kit
952-556	Dowel	Service part / kit
952-561	Plug - .060 O/S	Service part / kit
952-563	Plug - 5/8 - 18	Service part / kit
952-569	Plug - Camshaft Rear Bearing - Standard	Service part / kit
952-570	Plug - Camshaft Rear Bearing - .060 O/S	Service part / kit
952-577	Pointer	Service part / kit
952-596	Plug - 1.50 Cup	Service part / kit
952-688	Cover	Service part / kit
952-689	Block	Service part / kit
DZAE-6730-AA	oil pan drain plug	Service part / kit
E5AE-6730-AA	metric drain plug	Service part / kit
C20E-6734-A	old drain plug seal	Seal
EQEE-6734-AA	metric drain plug seal	Seal
ESAE-6734-AA	drain plug seal	Seal
241481	Switch, high temperature 268298 Sender, water temperature	Sensor
255264	Switch, low water temperature	Sensor
255913	Switch, pressure	Sensor
271425	Switch, anticipatory low oil pressure	Sensor

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-875-6005A?

The Ford LSG-875-6005A engine has an oil capacity of 6.2 liters.

What is the displacement of the Ford LSG-875-6005A?

The Ford LSG-875-6005A has a displacement of 7.5 liters with 8 cylinders.

Which generators use the Ford LSG-875-6005A engine?

The Ford LSG-875-6005A powers 3 generator set(s), including Cummins/Onan 75.0 ENT, Cummins/Onan ENTX, Cummins/Onan lsg-875.

How often should you change the oil in the Ford LSG-875-6005A?

The Ford LSG-875-6005A oil change interval is every 7 hours.

What is a common problem with the Ford LSG-875-6005A engine?

A commonly reported issue on generators using the Ford LSG-875-6005A is: Fault lamp lights and engine shuts down after running for a period. Cause: Oil level (engine will shut down if sensor is closed). Fix: Check oil level..