The Cummins/Onan GTA28E is a 28 L 12-cylinder turbocharged and coolant-air aftercooled engine rated at 1800 rpm, producing up to 574 kW. It powers generator sets from Cummins/Onan, including the C400N6, C450N6 and C500N6B. It holds 68 L (18.0 gal) of oil and 246 L (65.0 gal) of coolant.
Also known as: Cummins GTA28E
| Oil capacity | 68.0 L |
|---|---|
| Coolant capacity | 246.0 L |
| Displacement | 28.0 L |
| Cylinders | 12 |
| Aspiration | Turbocharged and coolant-air aftercooled |
| Rated speed | 1800 rpm |
| Gross power | 574 kW |
How to read your Cummins/Onan engine serial & model number →
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | ||||
| Fuel filter | — | ||||
| Oil filter | — | ||||
| Battery | — | ||||
| Belt | — | ||||
| Coolant | — | ||||
| Oil | — | ||||
| 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 | Frequency regulation | Isochronous | ||
| Pressure | Catalyst back pressure | 20.4 (5.08) | in. H2O (kPa) | |
| Pressure | Fuel inlet pressure at fuel shut off valve under full load | 254 to 508 | mm WC (10 to 20 in. WC) | full load |
| Pressure | Max air cleaner restriction (dirty filter) | 15 (3.7) | in. H2O (kPa) | |
| Pressure | Max allowable system back pressure | 47.7 (11.9) | in. H2O (kPa) | |
| Pressure | Max cooling air flow static restriction | 0.5 (0.12) | in. H2O (kPa) | |
| Pressure | Maximum fuel supply pressure | 635 | mm WC (25 in. WC) | under any conditions |
| Pressure | Maximum operating fuel supply pressure | 20 (5) | in. H2O (kPa) | |
| Pressure | Minimum operating fuel supply pressure | 10 (2) | in. H2O (kPa) | |
| Speed | Overspeed limit | 2200 | rpm | |
| Speed | Random frequency variation | ±0.5 | % | |
| Speed | Rated speed | 1800 | rpm | |
| Temperature | Alternator standard temperature rise | 125 | °C | standard |
| Temperature | Ambient design | 104 (40) | °F (°C) | |
| Temperature | Exhaust temp | 1156 (624) | °F (°C) | at set rated load |
| Temperature | Temperature rise for UL 1004 ratings | 120 | °C | or below, ambient temperature up to 40 °C |
| Voltage | Random voltage variation | ±1 | % | three-phase only |
| Voltage | Voltage regulation, no load to full load | ±1 | % |
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 | Natural gas (NG) | Fuel inlet pressure measured at the fuel shut off valve while under full load must be 254 to 508 mm WC (10 to 20 in. WC). Fuel supply pressure must not exceed 635 mm WC (25 in. WC) under any conditions. Additional options in the fuel train (CSA compliance, flexible fuel connections, strainers) add restriction that must be considered when determining gas supply pressure. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
The Cummins/Onan GTA28E engine has an oil capacity of 68.0 liters.
The Cummins/Onan GTA28E has a displacement of 28.0 liters with 12 cylinders.
The Cummins/Onan GTA28E powers 3 generator set(s), including Cummins/Onan C400N6, Cummins/Onan C450N6, Cummins/Onan C500N6B.