The Cummins/Onan NTA855-G7 is a 15 L 6-cylinder turbocharged engine, producing up to 391 kW. It powers generator sets from Cummins/Onan, including the C440 D5. It holds 20.8 L (5.5 gal) of coolant.
Part of the Cummins/Onan NTA855 engine family — 6 variants share parts & fitment.
| Coolant capacity | 20.8 L |
|---|---|
| Displacement | 15.0 L |
| Cylinders | 6 |
| Aspiration | Turbocharged |
| Gross power | 391 kW |
| Part # | Description | Category |
|---|---|---|
| 140-1346 | Air Cleaner Assembly | air_filter |
| 319-2236 | Bracket, Mounting | bracket |
| 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”) | bushing |
| 518-0548-58 | Clamp, Hose | clamp |
| 505-0100 | Nipple, Pipe - Close (1/2”) | nipple |
| 870-0212 | Nut, Locking (1/4-20) | nut |
| LF3000 | Lube, Spin-On | oil_filter |
| 100-1359 | Engine, Replacement (Cummins NTA855G) | other_service |
| 903-0124 | NA | other_service |
| 903-0204 | NA | other_service |
| 903-0500 | NA | other_service |
| 903-0604 | NA | other_service |
| 960-0138 | other_service | |
| 960-0606 | other_service | |
| 102-1335 | Plug, Oil Drain | plug |
| 307-2621-02 | Relay, Start Solenoid (K4) | relay |
| 800-0048 | Screw, Cap - Hex Head (3/8-16 x 3/4”) | screw |
| 800-0092 | Screw, Cap - Hex Head (1/2-13 x 1.5) | screw |
| 193-0432 | Sender, Oil Temperature (S2 Engine Block, E4 Oil Pan) | sensor |
| 960-0504 | PCC Control Service Manual | service_manual |
| 960-0507 | Detector Control Service Manual | service_manual |
| 309-0269 | Switch, Temperature - Low Engine Temperature (S4) | switch |
| 504-0011 | Valve, Shutoff (1/2”) | valve |
| 508-0292 | Washer, Sealing - Copper | washer |
| 526-0029 | Washer, Flat (3/8) | washer |
| 526-0219 | Washer, Flat (1/2) | washer |
| 850-0050 | Washer, Lock - Spring (3/8”) | washer |
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-G7 has a displacement of 15.0 liters with 6 cylinders.
The Cummins/Onan NTA855-G7 powers 1 generator set(s), including Cummins/Onan C440 D5.