The Cummins/Onan GTA38 is a 37.7 L 12-cylinder spark ignited engine rated at 1800 rpm, producing up to 634 kW. It powers generator sets from Cnge and Cummins/Onan, including the C400N5C, C580N6 and C635N6. It holds 129 L (34.1 gal) of oil and 272 L (71.9 gal) of coolant.
Also known as: Cummins GTA38, GTA38
Part of the Cummins/Onan GTA38 engine family — 2 variants share parts & fitment.
| Oil capacity | 129.0 L |
|---|---|
| Coolant capacity | 272.0 L |
| Displacement | 37.7 L |
| Cylinders | 12 |
| Aspiration | Spark Ignited |
| Rated speed | 1800 rpm |
| Gross power | 634 kW |
Shared across brands: Cnge, Cummins/Onan
| Part # | Description | Category |
|---|---|---|
| 3822524 | Use on v-belts ( 3/8 to 7/8) and v-ribbed belts with 5 ribs or less. | belt |
| 3822525 | Use on v-beits larger than 7/8 in. and v-ribbed belts with 6 or more ribs. | belt |
| 3305373 | DCAGSL (1/2 Gallon) | coolant_filter |
| 3315459 | DCAGOL (1 pint) | coolant_filter |
| 3317428 | DCA7S5L (5 Gallons) | coolant_filter |
| 3318320 | DCA95 | coolant_filter |
| DCA95 | Coolant Filter | coolant_filter |
| 3375432 | crack detection kit | other_service |
| 3375434 | crack detection developer | other_service |
| 3377462 | Optical Tachometer | other_service |
| 3377464 | Reflective Tape | other_service |
| 3376898 | Engine Water Pump | pump |
| 3375411 | Thermostat Seal Mandrel | thermostat |
| 3375049 | Oil Filter Wench | tool |
| 3375055 | Pressure Regulator Removal Tool | tool |
| 3375182 | Valve Spring Tester | tool |
| 3375301 | Tube Cutter | tool |
| 3376579 | Open spin-on full flow filter for inspection | tool |
| 3376891 | Fluorescent Tracer | tool |
| 3377253 | Blacklight (AC) Inspect for oil leak | tool |
| 3377394 | Blacklight (DC) Inspect for oil leak | tool |
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 GTA38 engine has an oil capacity of 129.0 liters.
The Cummins/Onan GTA38 has a displacement of 37.7 liters with 12 cylinders.
The Cummins/Onan GTA38 powers 7 generator set(s), including Cnge GTA38, Cummins/Onan C400N5C, Cummins/Onan C580N6, Cummins/Onan C635N6, Cummins/Onan C690N6.