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Isuzu 4LE2TAGV-03 Engine

Name: Isuzu 4LE2TAGV-03 Engine
Brand: Isuzu

The Isuzu 4LE2TAGV-03 is a 2.18 L 4-cylinder liquid cooled engine rated at 1800 rpm, producing up to 30 kW. It powers generator sets from Generac, Isuzu, John Deere and Magnum, including the MDG20IF4-MLG20IF4, MLG20IF4, MLT4200IF4 and MMG25IF4. It holds 10.4 L (2.7 gal) of oil and 17 L (4.5 gal) of coolant.

Also known as: Isuzu 4LE2TAGV-03

Part of the Isuzu 4LE2TAGV engine family — 2 variants share parts & fitment.

2.18 L

Displacement

Cylinders

1800 rpm

Rated speed

30 kW

Gross power

On this pageService parts Specs Generator sets Maintenance Filter cross-reference FAQ Service intervals Torque & specs Fluids Procedures

Service parts for the 4LE2TAGV-03

The cheapest captured merchant offer per filter — see the full cross-reference below for every OEM/aftermarket option.

Air intake

1 required

OE3557Air filterfind

Fuel system

1 required

69858Fuel filter$21.83Amazon

Oil system

1 required

670570304Oil filter$7.98PartsGeek

Prices captured from merchant listings; some links are affiliate links. Verify against your serial number before ordering.

Engine specifications

Oil capacity	10.4 L
Coolant capacity	17.0 L
Displacement	2.18 L
Cylinders	4
Aspiration	Liquid cooled
Rated speed	1800 rpm
Gross power	30 kW

Generator sets powered by this engine

Shared across brands: Generac, Isuzu, John Deere, Magnum

Generac MDG20IF4-MLG20IF4 Generac MLG20IF4 Generac MLT4200IF4 Generac MMG25IF4 Isuzu 4LE2TAGV-03 John Deere MLG20IF4 Magnum MLT4200IF4

This engine also powers 41 machine(s) on Power Equipment Info.

Troubleshooting

Fault codes

Code	Meaning	Remedy
0	In case of an emergency, always press the emergency stop switch located on the side of the unit to stop the engine immediately. The Stop/Reset (O) button may delay the engine shutdown if stop faults exist.	To prevent damage to the generator and connected equipment, remove all loads from the generator by opening all circuit breakers (turn to the OFF (O) position) before pressing the Stop/Reset (O) button.

Symptoms & remedies

Symptom	Cause
Ured current has fallen below the configured trip level	This is used to detect lamp failure.

Fault codes and symptom→remedy steps extracted from this engine’s service/owner documentation; verify against the official manual before servicing.

Common problems

High Coolant Temperature Shutdown
Fix: 1. Check coolant level in the overflow jug. 2. Restart engine and read the coolant temperature to verify a high coolant temperature shutdown. Stop engine immediately if the coolant temperature is 230°F (110°C) or more. 3. Allow engine to cool. Add coolant to the overflow jug if it is low and check the level of coolant in the radiator. To access the radiator cap, remove the access panel from the top of the enclosure.
Low Oil Pressure Shutdown
Fix: 1. Check engine oil level with the dipstick. The engine controller will shut the engine down when oil pressure is less than 20 psi (138 kPa). Add oil if required. 2. Visually inspect engine for oil leaks. 3. If oil level is good, restart the unit and verify the loss of oil pressure. Shut the engine down immediately if the oil pressure value does not read 5 psi (34 kPa) within five seconds. 4. Check oil pressure sender. To identify corrective action, see the troubleshooting section of the engine operator’s manual.
Unit will not start in AUTO with 2-wire start signal.
Cause: See if screen says unit not activated.
Unit was running and shuts down, attempts to restart. RPM SENSE LOSS
Cause: Check the LEDs/Screen for alarms.
Fix: Clear alarm and remove household loads from the generator. Put back in AUTO and restart. If problem returns, contact Independent Authorized Servicing Dealer to investigate possible fuel issue.
Unit shuts down during operation. HIGH TEMPERATURE
Cause: Check ventilation around the intake, exhaust and rear of generator.
Fix: Contact s Independent Authorized Servicing Dealer if no obstruction is found.
Unit running in AUTO but no power in house.
Cause: Check Generator Disconnect circuit breaker.
Fix: Contact Independent Authorized Servicing Dealer if Generator Disconnect circuit breaker is in the ON position.
Unit consumes large amounts of oil.
Cause: 1) Oil tank is over filled with oil. 2) Engine breather defective. 3) Improper type or viscosity of oil. 4) Damaged gasket, seal or hose.
Fix: 1) Adjust oil to proper level. 2) * 3) See Engine Oil Recommendations. 4) Check for oil leaks.
Undervoltage RED Unit shuts down during operation or starting. 1056 VSCF
Fix: Check the LEDs/Screen for alarms. The generator output voltage is too low. Probable causes are: 1) The load is too large. Remove load and attempt to restart unit. 2) Alternator or AVR damage. Contact Independent Authorized Servicing Dealer.
Speed mismatch RED Unit shuts down during Operation or starting. 1066 VSCF
Fix: Check the LEDs/Screen for alarms. Probable causes are: 1) Fuel problem (pressure loss). Check fuel supply and attempt to restart unit. 2) Large overload. Remove load and attempt to restart unit. 3) Throttle or engine problem. Contact Independent Authorized Servicing Dealer.
Shutdown indicator LED.
Fix: Resolve by resolving shutdown condition.
Phase Error RED Unit shuts down during starting. 1055 VSCF
Fix: Check the LEDs/Screen for alarms. An incorrect voltage and frequency has been detected during starting. Probable causes are: 1) Alternator damage. Contact Independent Authorized Servicing Dealer. 2) Generator has started into a severe load. Manually operate generator breaker and try to restart unit. If problem persists, remove load and attempt to restart unit again. 3) The engine may not be reaching its prescribed speed. Proceed as follows: •Verify stepper motor is moving and linkage is free. •Verify stepper motor is plugged in. •Verify gas pressure is within specified limits.
Overvoltage RED Unit shuts down during operation or starting. 1057 VSCF
Fix: Check the LEDs/Screen for alarms. Probable causes are: 1) The generator has been overloaded. Remove load and attempt to restart unit. 2) Generator has started into a severe load. Manually operate generator breaker and try to restart unit. If problem persists, remove load and attempt to restart unit again.
Overload RED Unit shuts down during operation. 1049 VSCF
Fix: Check the LEDs/Screen for alarms. Generator output is shorted or severely overloaded. Identify and clear the overload, and then restart.
Overfrequency RED Unit shuts down during operation. 1065
Fix: Check the LEDs/Screen for alarms. Probable causes are: 1) Overload. Remove load and attempt to restart unit. 2) RPM sensor has failed. Contact Independent Authorized Servicing Dealer. 3) Stepper motor problem. Contact Independent Authorized Servicing Dealer.
Output voltage is low/high.
Fix: Voltage calibration incorrect. Contact Independent Authorized Servicing Dealer.

Compiled from service & troubleshooting documentation across every generator set that uses the Isuzu 4LE2TAGV-03.

Maintenance schedule

Item	Spec	Part #	Interval
Air filter	Dry type cartridge air filter	—	250 hr
Fuel filter	Replace Fuel Filter Element	69858	500 hr	Amazon $21.83 eBay $21.83 FridayParts $36.28
Oil filter	Oil Filter Element Replacement	670570304	1000 hr	Amazon eBay $16.89 PartsGeek $7.98 FridayParts $20.19
Battery		—	1000 hr
Belt		—	1000 hr
Coolant		—	250 hr
Oil		—	250 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 intervals

Item	Action	Hours	Months	Notes
Engine Oil (Isuzu)	Change	50 hr		First service — First 50 hours (break-in period)
Oil Filter Element Replacement	Replace	500 hr		First service — Isuzu, first 50 hours and every 500 hours
Engine Oil and Oil Filter (John Deere)	Change	500 hr	12 mo	First service — First 100 hours break-in, factory fill; do not exceed 100 hours with break-in oil
Check Oil Vapor Recirculation System/Non-Return Valve	Check	250 hr		John Deere engine
Engine Oil (Isuzu, MMG25IF4)	Change	250 hr		Every 250 hours, MMG25IF4 only
Change Engine Oil and Replace Oil Filter	Change	500 hr	12 mo	First service — John Deere; decrease to every 250 hours if not using John Deere Plus 50 II oil
Engine Oil (Isuzu, MMG45IF4)	Change	500 hr		Every 500 hours, MMG45IF4 only; every 250 hours instead if harsh environment or fuel quality questioned
Fuel Filter Elements (Isuzu)	Replace	500 hr		Every 500 hours (every 250 hours if harsh environment/fuel quality questioned)
Fuel Filter Elements (John Deere)	Replace	500 hr	12 mo
Replace Engine Oil	Change	500 hr		First service — Isuzu, every 500 hours (or every 250 hours if harsh environment/fuel quality questioned)
Replace Fuel Filter Elements	Replace	500 hr	12 mo	John Deere engine
Replace Oil Vapor Recirculation Filter	Replace	500 hr	12 mo	John Deere engine
Service Battery	Other	500 hr	12 mo	John Deere engine
Water Sedimenter Element (Isuzu)	Clean	500 hr		Every 500 hours (every 250 hours if harsh environment/fuel quality questioned)
Air Cleaner Elements (John Deere)	Replace	2000 hr
Air Filter Element (Isuzu)	Replace	2000 hr
Alternator and Fan Belts (John Deere)	Replace	2000 hr
Check Generator Drive Plate Torque	Check	2000 hr		Isuzu engine
Lubricate Leveling Jacks	Lubricate	2000 hr		Isuzu engine
Replace Air Cleaner Elements	Replace	2000 hr		John Deere engine
Replace Air Filter Element	Replace	2000 hr		Isuzu engine
Replace Alternator and Fan Belts	Replace	2000 hr		John Deere engine
Replace Fan Belt	Replace	2000 hr		Isuzu engine
Test Thermostats	Test	2000 hr		John Deere engine
Diesel Particulate Filter (DPF)	Other	3000 hr		Expected service interval at least 3,000-4,500 hours depending on engine power/operating conditions; serviced by authorized provider only
Exhaust Filter (DPF) Service	Other	3000 hr		Expected service interval at least 3,000-4,500 hours based on engine power/operating conditions; serviced by authorized provider only
Reset Maintenance Alarm Intervals	Other	3000 hr		Power Zone controller maintenance alarm 3
Jack Maintenance (lubricate gearing/handle)	Lubricate		12 mo	Perform annually
Leveling Jacks	Lubricate		12 mo	Annually
Trailer Wheel Bearings Lubrication	Lubricate		12 mo	Minimum every 12 months or 12,000 miles (19,312 km)

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

Service specifications

Type	Item	Value	Unit	Condition
Other	AC voltage regulation	+/-1	%
Other	Air Filter Minder Gauge Replacement Threshold	20	in. H2O
Other	Radiator Cap Coolant Fill Clearance	3/4	in.	below filler neck (approx 2 cm)
Pressure	Loss-of-oil-pressure shutdown verification threshold	5	psi (34 kPa)	shut engine down immediately if pressure does not read this value within 5 seconds of restart
Pressure	Low Oil Pressure Shutdown Threshold	20	psi
Pressure	Low oil pressure shutdown threshold	15	psi (103 kPa)
Pressure	Maximum trailer tire pressure	65	psi
Pressure	Normal Operating Oil Pressure	35-80	psi
Pressure	Oil Pressure Gauge Range	0-100	psi
Pressure	Oil Pressure Shutdown Confirmation Threshold	5	psi	if not attained within 5 seconds of restart, shut engine down immediately
Pressure	Oil pressure loss verification threshold	5	psi (34 kPa)	must be reached within 5 seconds of restart or shut down immediately
Temperature	Coolant Temperature Gauge Range	150-250	°F
Temperature	High Coolant Temperature Shutdown Threshold	230	°F
Temperature	High coolant temperature shutdown	210	°F (99°C)
Temperature	High coolant temperature shutdown	230	°F (110°C)	stop engine immediately at or above this temperature
Temperature	Normal Operating Coolant Temperature	180-200	°F	average ambient air temperature of 70°F (21°C)
Torque	Generator Drive Plate Bolts	30	ft-lbs
Torque	Generator Drive Plate Bolts	40	ft-lbs
Torque	Generator drive plate bolts - MMG25IF4	30	ft-lbs (40 Nm)
Torque	Generator drive plate bolts - MMG35DF4	40	ft-lbs (54 Nm)
Torque	Generator drive plate bolts - MMG45IF4	30	ft-lbs (40 Nm)
Torque	Generator drive plate bolts - MMG55DF4	40	ft-lbs (54 Nm)
Torque	Trailer wheel lug nuts, first pass	20-25	ft-lbs (27-33 Nm)	first pass, star sequence
Torque	Trailer wheel lug nuts, second pass	50-60	ft-lbs (67-81 Nm)	second pass, star sequence
Torque	Trailer wheel lug nuts, third pass	90-120	ft-lbs (122-162 Nm)	third pass, star sequence
Torque	Wheel lug nuts, first pass	20-25	ft-lbs (27-33 Nm)
Torque	Wheel lug nuts, second pass	50-60	ft-lbs (67-81 Nm)
Torque	Wheel lug nuts, third pass	90-120	ft-lbs (122-162 Nm)
Voltage	Battery Voltage Gauge Range	0-50	V
Voltage	Generator output voltage (mast light circuit)	120 +/- 5	V
Voltage	Mast light transformer output	400 initial strike, stabilizing 240-260	VAC
Voltage	Normal Battery Reading	12-14	V	12 volt systems, engine running
Voltage	Normal Battery Reading	24-26	V	24 volt systems, engine running

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

Fluid	Grade	Standard	Ambient	Capacity	Notes
Engine oil	John Deere Plus 50 II (John Deere engine)				Refer to OEM engine manual for viscosity grade by season/climate
Fuel	Ultra-low-sulfur diesel			379.0 L (100 gal total, 90 gal usable)

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

Procedures

Troubleshooting Automatic Shutdown - High Coolant Temperature Shutdown diagnostic

⚠ Allow engine to cool before troubleshooting

Check the coolant level in the overflow jug
Restart and verify a high coolant temperature shutdown; stop immediately if coolant reaches 210°F (99°C)
Allow the engine to cool, then add coolant to the overflow jug and radiator as needed
Check the radiator shroud and ducting for blockage
Inspect coolant hoses, engine block, and water pump for leaks
Check the serpentine drive belt tension for the water pump
Remove the load, restart, and monitor coolant temperature; shut down immediately if it overheats again

Troubleshooting Automatic Shutdown - Low Oil Pressure Shutdown diagnostic

⚠ Allow engine to cool before troubleshooting

Check engine oil level with the dipstick and add oil if required
Visually inspect the engine for oil leaks
Restart and verify oil pressure does not read above 5 psi (34 kPa) within 5 seconds, or shut down immediately
Check the oil pressure sender; refer to the engine operator's manual for corrective action

Troubleshooting the Lights - Mast Lights On But Light Output Is Low diagnostic

⚠ Only a qualified electrician should troubleshoot or repair electrical problems

Clean the fixture reflector and both sides of the lens with mild soap and water
Replace the bulb if worn from normal use
Check the mast coil cord, junction box, and light connections
Verify generator output is 120V +/-5V; adjust the voltage regulator if incorrect
Check transformer output (should strike near 400VAC then stabilize 240-260VAC); check capacitor/coil if incorrect

Light Tower Set Up installation

⚠ Keep area above the unit clear of overhead wires and obstructions; mast extends to 30 ft (9.14 m)

Locate the unit at or above the area to be illuminated
Place unit on firm, flat ground and block the wheels
Rotate the tongue jack 90° and raise the trailer tongue off the tow vehicle
Connect a good earthen ground to the grounding stud near the trailer tongue
Extend and lock the outriggers, then rotate and lower the outrigger jacks
Level the trailer using all four jacks
Adjust and aim the lamps, then tighten hardware and connect to the junction box

Checking Generator Drive Plate Torque maintenance

Disconnect engine starting battery
Remove generator fan guard
Tighten each drive plate bolt to specification in Table 4
Install generator fan guard
Connect battery

Resetting the Maintenance Alarms maintenance

With unit shut down, move Control Power switch to ON
Press any directional arrow to enter maintenance screens
Press Enter and Stop/Reset simultaneously to open Configuration menu
Move cursor down to Maintenance group
Press right arrow to access sections and highlight Maintenance section
Press right arrow to access parameters and highlight the alarm to reset
Press Enter to select editable parameter, highlight Reset
Press Enter to reset the selected alarm
Repeat for additional alarms
Press and hold Enter for five seconds to save changes

Towing the Unit - Wheel Lug Torque maintenance

Tools: Torque wrench

Start all lug nuts by hand.
First pass: tighten to 20-25 ft-lbs (27-33 Nm).
Second pass: tighten to 50-60 ft-lbs (67-81 Nm).
Third pass: tighten to 90-120 ft-lbs (122-162 Nm).
Re-torque lug nuts in sequence after first road use.

Lowering the Mast - Manually operation

⚠ Stop immediately if the mast hangs up or the winch cable develops slack

Shut down lights and engine; let lights cool 10-15 minutes
Loosen the mast rotation knob, align the white arrows, and retighten
Turn the upper mast winch handle counterclockwise to collapse the mast, keeping the electrical cord clear
Release the mast lock and lower the mast into the transport cradle with the lower winch
Insert and secure the mast cradle locking pin

Manual Starting of the Unit operation

⚠ Running engines produce carbon monoxide - asphyxiation hazard

Move Control Power switch to ON
Verify controller enters Stop mode/Home screen
Press Engine Start button in Manual mode

Raising the Mast operation

⚠ Never raise or lower the mast while the unit is operating

⚠ Stop immediately if the winch cable develops slack or a mast section sticks

Set up and level the unit with outriggers extended
Remove the mast cradle locking pin
Check mast cables and electrical cord for wear or damage
Clear the area around the unit before raising the mast
Remove the safety pin from the mast lock bar and raise the mast with the lower winch until it locks; reinsert the safety pin
Telescope the mast to desired height with the upper winch, watching the electrical cord
Rotate the mast to the desired direction and tighten the rotation knob

Shutting Down the Unit operation

Remove all loads from the receptacles
Switch each light circuit breaker OFF
Switch the main circuit breaker OFF
Press the Stop/Reset (O) button
Move the Control Power switch to OFF after the unit shuts down

Towing the Unit operation

Raise the rear jack and outrigger jacks into travel position and lock the pins
Slide outriggers into the frame and lock the pins
Raise or lower the trailer onto the tow vehicle hitch with the tongue jack; attach safety chains
Grease the leveling jack fittings
Connect trailer wiring and check directional/brake lights
Confirm the mast cradle locking pin is in place and doors are latched
Remove bulbs from light fixtures if driving over rough ground
Check trailer tire inflation
Torque wheel lugs in three passes if a tire was removed: 20-25, then 50-60, then 90-120 ft-lbs

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 Isuzu 4LE2TAGV family

Part #	Description	Category
90243	Air Filter Element	air_filter
01035	Central Lift Point	central_lift_point
01144	Controller	controller
209649	Form: SFC626B	other_service

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

Filters for this engine

Air filter: Generac OE3557 Generac OE3656 Isuzu 8972319000 Isuzu 5864014350 Isuzu 8972599390 Donaldson P827653 Donaldson P821575 Donaldson P822858
Fuel filter: Generac 69858 Isuzu 8944015310 Isuzu H132401 Donaldson P502166 Donaldson P550057 Wix 33263 Wix 33386 Ac Delco TP1231
Oil filter: Generac 670570304 Isuzu 5876100080 Donaldson P550162 Wix 51334 Ac Delco X45

Cross-referenced via Donaldson + OEM/engine-maker interchange — options to verify against your serial number, not confirmed for every exact variant.

Also used in

Hitachi ZX40U — Excavator Compact
Hitachi ZX50U — Excavator Compact
Kobelco SK80 — Excavator Tracked

Other equipment known to use this engine, via filter-application cross-reference — useful for sourcing parts even when your exact machine isn't listed elsewhere on this page.

Common questions

What is the oil capacity of the Isuzu 4LE2TAGV-03?

The Isuzu 4LE2TAGV-03 engine has an oil capacity of 10.4 liters.

What is the displacement of the Isuzu 4LE2TAGV-03?

The Isuzu 4LE2TAGV-03 has a displacement of 2.18 liters with 4 cylinders.

Which generators use the Isuzu 4LE2TAGV-03 engine?

The Isuzu 4LE2TAGV-03 powers 7 generator set(s), including Generac MDG20IF4-MLG20IF4, Generac MLG20IF4, Generac MLT4200IF4, Generac MMG25IF4, Isuzu 4LE2TAGV-03.

What oil filter does the Isuzu 4LE2TAGV-03 use?

The Isuzu 4LE2TAGV-03 uses oil filter part numbers Generac 670570304, Isuzu 5876100080, Donaldson P550162.

What fuel filter does the Isuzu 4LE2TAGV-03 use?

The Isuzu 4LE2TAGV-03 uses fuel filter part numbers Generac 69858, Isuzu 8944015310, Isuzu H132401.

What air filter does the Isuzu 4LE2TAGV-03 use?

The Isuzu 4LE2TAGV-03 uses air filter part numbers Generac OE3557, Generac OE3656, Isuzu 8972319000.

How often should you change the oil in the Isuzu 4LE2TAGV-03?

The Isuzu 4LE2TAGV-03 oil change interval is every 250 hours.

What is a common problem with the Isuzu 4LE2TAGV-03 engine?

A commonly reported issue on generators using the Isuzu 4LE2TAGV-03 is: High Coolant Temperature Shutdown. Fix: 1. Check coolant level in the overflow jug. 2. Restart engine and read the coolant temperature to verify a high coolant temperature shutdown. Stop engine immediately if the coolant temperature is 230°F (110°C) or more. 3. Allow engine to cool. Add coolant to the overflow jug if it is low and check the level of coolant in the radiator. To access the radiator cap, remove the access panel from the top of the enclosure..