The Cummins/Onan NTA855-G4 is a 14 L 6-cylinder turbocharged and water-to-air after-cooled engine rated at 1500 rpm. It powers generator sets from Cummins/Onan, including the C380 D5. It holds 39 L (10.3 gal) of oil and 21 L (5.5 gal) of coolant.
Also known as: Cummins NTA855-G4
Part of the Cummins/Onan NTA855 engine family — 17 variants share parts & fitment.
| Oil capacity | 39.0 L |
|---|---|
| Coolant capacity | 21.0 L |
| Displacement | 14.0 L |
| Cylinders | 6 |
| Aspiration | Turbocharged and water-to-air after-cooled |
| Rated speed | 1500 rpm |
How to read your Cummins/Onan engine serial & model number →
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | ||||
| Fuel filter | — | ||||
| Oil filter | — | ||||
| Battery | — | ||||
| Belt | — | ||||
| Coolant | — | ||||
| Oil | — | ||||
| Spark plug | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Part # | Description | Category |
|---|---|---|
| 122-0526 | Bypass Hood, Air Inlet (Used on Heavy Duty Air Cleaner) | Air filter |
| 140-1346 | Air Cleaner (Includes Element) | Air filter |
| 140-2391 | Element - Air Cleaner (Standard) | Air filter |
| 140-2392 | Element, Air Cleaner - Primary | Air filter |
| 140-2393 | Element, Air Cleaner - Safety | Air filter |
| 511-0084 | Belt, Charging Alternator | Belt |
| 511-0160 | Belt, Drive - V (Fan) | Belt |
| 319-2236 | Bracket, Mounting | Bracket |
| 518-0548-58 | Clamp, Hose | Clamp |
| 130-3537 | CE 1 130-3541 3318318 CE 1 4 501-0551 1 5 503-1467-07 1 503-0189 2 505-0022 1 502-0827 | Coolant filter |
| 130-3541 | Filter, Water - w/Corrosion Inhibiting Chemical DCA4 (Pre-Charging) | Coolant filter |
| 0300-4623-09 | DFCB (600V) | Current transformer |
| 0300-4623-10 | DFCC (600V) | Current transformer |
| 0300-4623-24 | DFCB BR (0-480V) | Current transformer |
| 0300-4623-27 | DFCC BR (0-480V) | Current transformer |
| 155-2287-02 | Gasket, Flange (used with 155-2281 Elbow) | Gasket |
| 501-0551 | Line, Fuel - Flexible (Bypass line) | Hose |
| 503-1467-07 | Hose, Rubber (3/4" ID x 33" LG) Radiator to Filter Housing | Hose |
| 503-1679-02 | Hose, Rubber - Upper | Hose |
| 505-1414-01 | Hose, Rubber - Lower | Hose |
| 122-0755 | Lube & Bypass Filter (Latest Style Used In Engine Manufacturing) | Oil filter |
| LF3000 | Lube, Spin-On | Oil filter |
| 100-1359 | Engine, Replacement (Cummins NTA855G) | Service part / kit |
| 102-1335 | Plug, Oil Drain | Service part / kit |
| 305-0813-02 | CUMMINS battery charger 208VAC/24VDC/10A | Service part / kit |
| 307-2621-02 | Relay, Start Solenoid (K4) | Service part / kit |
| 309-0437 | (222"F) | Service part / kit |
| 504-0011 | Valve, Shutoff (1/2”) | Service part / kit |
| 505-0019 | Bushing, Pipe - Reducer 1/2” to 3/8”, DFBF (1/2” to 3/8”) 505-0131 DFCB, DFCC, DFCE (3/4” to 3/8”) | Service part / kit |
| 505-0100 | Nipple, Pipe - Close (1/2”) | Service part / kit |
| 526-0029 | *Washer, Flat (1/2") | Service part / kit |
| 526-0219 | Washer, Flat (1/2) | Service part / kit |
| 800-0048 | Screw, Cap - Hex Head (3/8-16 x 3/4”) | Service part / kit |
| 800-0092 | Screw, Cap - Hex Head (1/2-13 x 1.5) | Service part / kit |
| 850-0050 | Washer, Lock - Spring (3/8”) | Service part / kit |
| 870-0212 | Nut, Locking (1/4-20) | Service part / kit |
| 903-0124 | NA | Service part / kit |
| 903-0204 | NA | Service part / kit |
| 903-0500 | NA | Service part / kit |
| 903-0604 | NA | Service part / kit |
| E204747 | Coolant heater 240/480V 6420W 1PH | Service part / kit |
| 508-0292 | Washer, Sealing - Copper | Seal |
| 151-0411 | Pickup, Magnetic | Sensor |
| 193-0244 | Sender, Pressure - 0i1 | Sensor |
| 193-0375 | # Sender, Water Temperature | Sensor |
| 193-0432 | Sender, Oil Temperature (S2 Engine Block, E4 Oil Pan) | Sensor |
| 309-0179 | Switch, High Water Temperature | Sensor |
| 309-0269 | Sender, Temperature-Lo Engine | Sensor |
| 333-0407 | Switch, Pressure - Oil, 14# PSI (SHUTDOWN) With Dual Terminals | Sensor |
| 960-0504 | PCC Control Service Manual | Service manual |
| 960-0507 | Detector Control Service Manual | Service manual |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
The Cummins/Onan NTA855-G4 engine has an oil capacity of 39.0 liters.
The Cummins/Onan NTA855-G4 has a displacement of 14.0 liters with 6 cylinders.
The Cummins/Onan NTA855-G4 powers 1 generator set(s), including Cummins/Onan C380 D5.