The Cummins/Onan GTA855-G2 is a 14 L 8-cylinder natural aspiration engine rated at 1500 rpm, producing up to 336 kW. It powers generator sets from Cummins/Onan, including the GFBB. It holds 104 L (27.5 gal) of oil and 25 L (6.6 gal) of coolant.
Also known as: Cummins GTA855-G2
Part of the Cummins/Onan GTA855 engine family — 4 variants share parts & fitment.
| Oil capacity | 104.0 L |
|---|---|
| Coolant capacity | 25.0 L |
| Displacement | 14.0 L |
| Cylinders | 8 |
| Aspiration | Natural aspiration |
| Rated speed | 1500 rpm |
| Gross power | 336 kW |
How to read your Cummins/Onan engine serial & model number →
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Not specified | — | |||
| Fuel filter | Not specified | — | |||
| Oil filter | Not specified | — | |||
| Battery | Not specified | — | |||
| Belt | Not specified | — | |||
| Coolant | Not specified | — | |||
| Oil | Not specified | — | |||
| Spark plug | Not specified | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Fuel | dry processed natural gas | 905 BTU per standard cubic foot (33.72 kJ/l) lower heating value | Test condition |
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 |
|---|---|---|
| 3801468 | Set, Lower Engine Gasket | gasket |
| 4024959 | Set, Upper Engine Gasket | gasket |
| 3014404 | Nozzle, Piston Cooling | injector |
| 214950 | Bearing, Connecting | other_service |
| 3043928 | Camshaft | other_service |
| 3081251 | Housing, Cam Follower | other_service |
| 3801106 | Kit, Camshaft Bushing | other_service |
| 3801260 | For cylinder 4-5 | other_service |
| 3801826 | Kit, Cylinder Liner | other_service |
| 4955662 | Kit, Engine Piston | other_service |
| 3054948 | Ring, Liner Seal | seal |
| 3411335 | Thermostat | thermostat |
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 GTA855-G2 engine has an oil capacity of 104.0 liters.
The Cummins/Onan GTA855-G2 has a displacement of 14.0 liters with 8 cylinders.
The Cummins/Onan GTA855-G2 powers 1 generator set(s), including Cummins/Onan GFBB.