The Isuzu 4LE1 is a 2.18 L 4-cylinder turbocharged (4le1t); naturally aspirated (4le1n) engine rated at 1800 rpm, producing up to 23.55 kW. It powers generator sets from Isuzu, MMD Equipment and Winco, including the 4LE1NYBW, 4le1t, ILS-4LE1-A and ILS-4LE1-C. It holds 8.6 L (2.3 gal) of oil and 50 L (13.2 gal) of coolant.
Also known as: Isuzu 4LE1, 4LE1
Part of the Isuzu 4LE1 engine family — 2 variants share parts & fitment.
The cheapest captured merchant offer per filter — see the full cross-reference below for every OEM/aftermarket option.
Prices captured from merchant listings; some links are affiliate links. Verify against your serial number before ordering.
| Oil capacity | 8.6 L |
|---|---|
| Coolant capacity | 50.0 L |
| Displacement | 2.179 L |
| Cylinders | 4 |
| Aspiration | Turbocharged (4LE1T); Naturally aspirated (4LE1N) |
| Rated speed | 1800 rpm |
| Gross power | 23 kW |
Shared across brands: Isuzu, MMD Equipment, Winco
This engine also powers 2 machine(s) on Power Equipment Info.
Compiled from service & troubleshooting documentation across every generator set that uses the Isuzu 4LE1.
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Air Filter Element | 8025818 | Amazon eBay | ||
| Fuel filter | Fuel Filter Elements | 2994048 | Amazon eBay | ||
| Oil filter | Oil Filter (2 req’d) | 2992544 | Amazon eBay FridayParts $55.99 | ||
| Belt | Alternator Belt | 500341810 | Amazon eBay | ||
| Coolant | 4.2 | — | |||
| Oil | Spin-on | 4.0 | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Clearance | Axial play of idle gear | 0.058 — 0.115 {0.0023 — 0.0045} | mm {in} | |
| Clearance | Axial play of the connecting rod and the crank pin | 0.20 — 0.33 {0.008 — 0.013} | mm {in} | |
| Clearance | Axial play of the crankshaft | 0.058 — 0.208 {0.0023 — 0.0082} | mm {in} | measure at the front of the thrust in No.2 journal portion |
| Clearance | Axial play of turbine shaft (turbocharger) | 0.06 — 0.09 {0.0024 — 0.0035} | mm {in} | assembly specification; service limit 0.11 {0.0043} |
| Clearance | Clearance between the connecting rod bearing and crank pin (φ25) | 0.026 — 0.067 {0.0010 — 0.0026} | mm {in} | |
| Clearance | Clearance between the connecting rod bearing and crank pin (φ27) | 0.035 — 0.073 {0.0014 — 0.0029} | mm {in} | |
| Clearance | Clearance between the exhaust valve stem and valve guide | 0.030 — 0.063 {0.0012 — 0.0025} | mm {in} | |
| Clearance | Clearance between the idle gear bushing and shaft | 0.025 — 0.085 {0.00098 — 0.00330} | mm {in} | |
| Clearance | Clearance between the inlet valve stem and valve guide | 0.023 — 0.056 {0.0009 — 0.0022} | mm {in} | |
| Clearance | Clearance between the journal and the bearing | 0.029 — 0.072 {0.0011 — 0.0028} | mm {in} | |
| Clearance | Clearance between the rocker arm and the rocker arm shaft | 0.005 — 0.045 {0.0002 — 0.0018} | mm {in} | |
| Clearance | Clearance between the small end bushing and the piston pin | 0.008 — 0.020 {0.00031 — 0.00079} | mm {in} | |
| Clearance | Clearance between the tappet and the cylinder block | 0.020 — 0.054 {0.0008 — 0.0021} | mm {in} | |
| Clearance | Clearance with the cylinder bore (piston) | 0.040 — 0.085 {0.0016 — 0.0033} | mm {in} | measured 54.85 mm from top surface |
| Clearance | Deflection of the fan belt (approx. 98 N {22 lb}) | Approx. 8.0 — 10.0 {0.315 — 0.394} | mm {in} | push between the fan pulley and the generator pulley |
| Clearance | Valve clearance (service limit) | 0.35 — 0.45 | mm | cold |
| Clearance | Valve clearance inlet valve | 0.40 ± 0.05 | mm | at cold condition |
| Gap | Pinion gap (starter) | 0.5 — 2.0 {0.020 — 0.079} | mm {in} | |
| Gap | Piston ring end gap — Oil ring | 0.20 — 0.40 {0.008 — 0.016} | mm {in} | |
| Gap | Piston ring end gap — Second ring | 0.20 — 0.40 {0.008 — 0.016} | mm {in} | |
| Gap | Piston ring end gap — Top ring | 0.20 — 0.35 {0.008 — 0.014} | mm {in} | |
| Injection timing | Fuel injection timing (at stop) | 12 | ° BTDC | at stop |
| Injection timing | Injection timing | BTDC 2° | ° | standard |
| Pressure | Compression pressure of the cylinder | 3.04 {441} | MPa {psi} | coolant temperature 70 — 85 °C, engine speed approx. 250 rpm |
| Pressure | Compression pressure service limit | 2.5 {363} | MPa {psi} | approx. 250 rpm |
| Pressure | Injection pressure | 14.7 {2,132} | MPa {psi} | |
| Pressure | Lubrication oil pressure | 147 {21} | kPa {psi} | at 1,000 rpm |
| Pressure | Lubrication oil pressure | 294 {43} | kPa {psi} | at 1,800 rpm |
| Pressure | Lubrication oil pressure | 343 — 686 {50 — 100} | kPa {psi} | at 2,200 rpm |
| Pressure | Nozzle opening pressure | 15.2 — 16.2 {2205 — 2350} | MPa {psi} | |
| Pressure | Relief valve starting pressure (oil pump) | 391 — 489 {56.7 — 70.9} | kPa {psi} | |
| Pressure | Relief valve starting pressure (oil pump) | 490 — 588 {71.1 — 85.3} | kPa {psi} | |
| Pressure | Water pressure test (three minutes) | 490 {71} | kPa {psi} | three minutes |
| Resistance | Field coil resistance (12V-35A Hitachi generator) | 3.1 | Ω | at 20 °C |
| Resistance | Field coil resistance (12V-50A generator) | 2.6 | Ω | at 20 °C |
| Resistance | Glow plug resistance | 3 | Ω | |
| Speed | Compression test engine speed | 250 | rpm | full-charged battery |
| Temperature | EGR valve closes when engine coolant temperature | 55 {131} | °C {°F} | closed position |
| Temperature | EGR valve opens when engine coolant temperature | 60 {140} | °C {°F} | opened position |
| Temperature | Thermostat full-open temperature | 95 {203} | °C {°F} | at barometric pressure |
| Temperature | Thermostat working start temperature | 82 {180} | °C {°F} | at barometric pressure |
| Torque | Bearing cap bolt (connecting rod small end diameter φ25 mm) | 73.5 — 83.4 {7.5 — 8.5 / 54.2 — 61.5} | N·m {kgf·m/lb·ft} | apply engine oil to thread and seating surface |
| Torque | Bearing cap bolt (connecting rod small end diameter φ27 mm) | 23 — 26 {2.3 — 2.7 / 17.0 — 19.2} → 100° — 115° | N·m {kgf·m/lb·ft} | apply engine oil to thread and seating surface |
| Torque | Camshaft gear lock nut | 68.6 — 88 {6.99 — 8.97 / 50.5 — 64.9} | N·m {kgf·m/lb·ft} | |
| Torque | Control lever nut (governor) | 11.8 — 17.7 {1.2 — 1.8 / 8.7 — 13.1} | N·m {kgf·m/lb·ft} | |
| Torque | Crank bearing cap bolt | 83.4 — 93.2 {8.5 — 9.5 / 61.5 — 68.7} | N·m {kgf·m/lb·ft} | apply engine oil to thread and seating surface |
| Torque | Crank pulley mounting bolt | 167 — 186 {17.0 — 19.0 / 123.2 — 137.2} | N·m {kgf·m/lb·ft} | |
| Torque | Cylinder head bolt M12 × 1.5 | 83.4 — 93.2 {8.5 — 9.5 / 61.5 — 68.7} → 60° — 90° | N·m {kgf·m/lb·ft} | angle method; apply engine oil to seating surface and thread |
| Torque | Cylinder head bolt M8 × 1.25 | 24.5 — 34.3 {2.5 — 3.5 / 18.1 — 25.3} | N·m {kgf·m/lb·ft} | |
| Torque | Delivery valve holder | 39.2 — 44.1 {4.0 — 4.5 / 28.9 — 32.5} | N·m {kgf·m/lb·ft} | |
| Torque | Flywheel housing mounting bolt | 41.2 — 54.9 {4.2 — 5.6 / 30.4 — 40.5} | N·m {kgf·m/lb·ft} | |
| Torque | Flywheel mounting bolt | 88.3 — 108 {9.0 — 11.0 / 65.1 — 79.7} | N·m {kgf·m/lb·ft} | tighten in numerical order |
| Torque | Glow plug | 20.0 — 25.0 {2.0 — 2.5 / 14.8 — 18.4} | N·m {kgf·m/lb·ft} | |
| Torque | Idle gear thrust collar bolt | 20.6 — 30.4 {2.1 — 3.1 / 15.2 — 22.4} | N·m {kgf·m/lb·ft} | |
| Torque | Injection pipe sleeve nut | 14.7 — 24.5 {1.5 — 2.5 / 10.8 — 18.1} | N·m {kgf·m/lb·ft} | |
| Torque | Nozzle holder ASM | 39.2 — 49.0 {4.0 — 5.0 / 28.9 — 36.1} | N·m {kgf·m/lb·ft} | |
| Torque | Oil filter | 14.7 — 20.6 {1.5 — 2.1 / 10.8 — 15.2} | N·m {kgf·m/lb·ft} | |
| Torque | Oil pan drain plug | 68.6 — 88.2 {7.0 — 9.0 / 50.6 — 65.1} | N·m {kgf·m/lb·ft} | |
| Torque | Starter mounting bolt | 93.2 — 113 {9.5 — 11.5 / 68.7 — 83.3} | N·m {kgf·m/lb·ft} | |
| Valve clearance | Valve clearance (inlet and exhaust) | 0.40 | mm | cold |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Coolant | Isuzu genuine engine coolant | 4.2 L | Engine only. Mix ratio 30 to 60% with tap water (soft water), distilled water or demineralized water. | ||
| Engine oil | CD or CF-4 (also CE, CF, CH-4, CI-4 or CI-4 Plus) | API service category | 4.0 L | With turbocharger. Isuzu genuine engine oil: Besco Super: CC, Besco S-3: CD, Besco Multi Z: CD. Viscosity chart: single grade SAE 40, SAE 30, SAE 20/20W, SAE 10W, SAE 5W-20; multi grade SAE 10W-30, SAE 15W-40, 20W-40. | |
| Fuel | Diesel (JIS K2204) | JIS K2204 |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
⚠ Recheck the tension of the belt after fixing the generator.
Tools: Finger pressure approx. 98 N {22 lb}
⚠ Adjust the shims for each injection pump of four cylinders at the same time.
⚠ Be careful with dirt getting inside when removing/installing the delivery valve or spring.
Tools: Wrench
⚠ Use the thickness gauge when the engine is cold.
⚠ Rocker arm is die-cast aluminum — do not over-tighten.
⚠ Do not push down the valve spring when measuring.
Tools: Thickness gauge
Tools: 24 V power supply
⚠ Be sure to measure for all cylinders.
⚠ Use the full-charged battery to maintain engine speed of 250 rpm or more.
Tools: Compression gauge 5-8840-2675-0, Adapter 5-8840-9029-0
⚠ Do not remove the radiator cap when the cooling water is at high temperature.
Tools: Radiator cap tester
⚠ Replace the copper packing with a new one if the air bleed plug is loosened.
⚠ Replace the coolant when it is cooled.
Tools: Oil filter wrench
⚠ As the cartridge holds fuel, take care not to dirty around the system when removing it. Also take care of fire.
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Part # | Description | Category |
|---|---|---|
| TB1207B | Liquid gasket (ThreeBond) | Gasket |
| TB1207C | Liquid gasket (ThreeBond) | Gasket |
| 897129-6440 | Nozzle | Injector |
| 897360-7860 | Nozzle holder ASM | Injector |
| 894423-7560 | Generator (12V-35A) Hitachi, Ltd. | Service part / kit |
| 897225-1170 | Generator (12V-35A) DENSO | Service part / kit |
| 897226-8408 | Generator (12V-20A) Hitachi, Ltd. | Service part / kit |
| 897228-3180 | Generator (12V-50A) Hitachi, Ltd. | Service part / kit |
| 897147-5801 | Injection pump | Pump |
| 898074-7740 | Injection pump | Pump |
| 898098-8750 | Injection pump | Pump |
| 897112-8652 | Starter (12V-2.0kW) DENSO CORPORATION | Starter |
| 898094-1080 | Starter (12V-2.2kW) Mitsubishi Electric Co. | Starter |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.
Cross-referenced via Donaldson + OEM/engine-maker interchange — options to verify against your serial number, not confirmed for every exact variant.
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.
The Isuzu 4LE1 engine has an oil capacity of 8.6 liters.
The Isuzu 4LE1 has a displacement of 2.179 liters with 4 cylinders.
The Isuzu 4LE1 powers 7 generator set(s), including Isuzu 4LE1NYBW, Isuzu 4le1t, Isuzu ILS-4LE1-A, Isuzu ILS-4LE1-C, Isuzu ML23IMRD.
The Isuzu 4LE1 uses oil filter part numbers Isuzu 5876100080, Donaldson P550162, Wix 51334.
The Isuzu 4LE1 uses fuel filter part numbers Isuzu 8944015310, Donaldson P502166, Wix 33263.
The Isuzu 4LE1 uses air filter part numbers Isuzu 5864014350, Isuzu 8972599390, Donaldson P775687.
A commonly reported issue on generators using the Isuzu 4LE1 is: Starter runs but does not start. Fix: OK.