The Cummins/Onan GTA855-G1 is a 14 L spark ignited engine rated at 1500 rpm, producing up to 218 kW. It powers generator sets from Cummins/Onan, including the GFBA. It holds 97 L (25.6 gal) of coolant.
Also known as: Cummins GTA855-G1
Part of the Cummins/Onan GTA855 engine family — 5 variants share parts & fitment.
| Coolant capacity | 97.0 L |
|---|---|
| Displacement | 14.0 L |
| Aspiration | Spark ignited |
| Rated speed | 1500 rpm |
| Gross power | 218 kW |
How to read your Cummins/Onan engine serial & model number →
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Oil filter | Single spin-on canister-combination full flow with bypass | — |
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 lower heating value | Running pressure to carburetor (after regulation) 5-7 in H2O (127-177 mm H2O); running pressure to engine mounted regulator 10-20 in H2O (254-508 mm H2O); minimum gas supply pipe size @ engine 2.0 in (50.8 mm); gas supply filter pressure rating 100 PSI (690 kPa). Propane (HD-5) also listed applicable at 8.5:1 compression. | ||
| 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 | Service part / kit |
| 3043928 | Camshaft | Service part / kit |
| 3081251 | Housing, Cam Follower | Service part / kit |
| 3801106 | Kit, Camshaft Bushing | Service part / kit |
| 3801260 | Set, Main BRG-STD | Service part / kit |
| 3801826 | Kit, Cylinder Liner | Service part / kit |
| 4955662 | Kit, Engine Piston | Service part / kit |
| 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-G1 has a displacement of 14.0 liters.
The Cummins/Onan GTA855-G1 powers 1 generator set(s), including Cummins/Onan GFBA.