The Cummins/Onan GTA855-G3 is a 14 L engine rated at 1500 rpm. It powers generator sets from Cummins/Onan, including the GFBC.
Also known as: Cummins GTA855-G3
Part of the Cummins/Onan GTA855 engine family — 4 variants share parts & fitment.
| Displacement | 14.0 L |
|---|---|
| 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 | 74.0 L | — | |||
| Oil | 34.0 L | — | |||
| Spark plug | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Other | Compression Ratio | 8.5:1 | ||
| Other | Cranking Current | 900 | amps | at ambient temperature of 0 °C (32 °F) |
| Pressure | Running Pressure to Engine (Natural Gas) | 381 to 508 | mm WC | |
| Speed | Overspeed Limit | 2100 | rpm | |
| Speed | Rated Speed | 1800 | rpm | |
| Temperature | Maximum Gas Temperature - Dry Stack | 659 | °C | Full Load |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Fuel | Low Pressure Dry Processed Natural Gas | 905 BTU/ft.3 L.H.V. (33.72 kJ/L) | Running pressure to engine 381 to 508 mm WC (15 to 20 in. WC); minimum gas supply pipe size @ engine 50.8 mm (2.0 in.) | ||
| 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 | For cylinder 4-5 | 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-G3 has a displacement of 14.0 liters.
The Cummins/Onan GTA855-G3 powers 1 generator set(s), including Cummins/Onan GFBC.