The Cummins/Onan 4BTA3.9 is a 3.9 L turbocharged engine rated at 1800 rpm. It powers generator sets from Cummins/Onan, including the DGCA, DGCB and DGCG. It holds 10.4 L (2.7 gal) of oil and 10 L (2.6 gal) of coolant.
Also known as: Cummins 4BTA3.9
Part of the Cummins/Onan 4BTA3.9 engine family — 5 variants share parts & fitment.
| Oil capacity | 10.4 L |
|---|---|
| Coolant capacity | 10.0 L |
| Displacement | 3.9 L |
| Aspiration | Turbocharged |
| Rated speed | 1800 rpm |
| Part # | Description | Category |
|---|---|---|
| 2.4L | Engine | engine |
| 285542 | Gasket. manifold | gasket |
| 265484 | Line. flex. fuel, 41" | hose |
| 266110 | Line, flex. fuel, 50” | hose |
| 271500 | Line. flex. fuel, 22” | hose |
| 285498 | Hose, molded | hose |
| 285722 | Hose, upper molded | hose |
| 285957 | Line. flex. fuel. 18” | hose |
| X-797-2 | Line, fuel | hose |
| A046K020 | Oil Filter | oil_filter |
| 0L2090-C | 60 kW (2.4 L) | other_service |
| A-290538 | Block heater | other_service |
| A-290885 | Heater, block (240V) | other_service |
| 240976 | Switch, high temperature 268298 Sender, temperature | sensor |
| 241481 | Switch, high temperature 268298 Sender, water temperature | sensor |
| 268298 | Sender, water temperature gauge | sensor |
| 290090 | Switch, low water temperature | sensor |
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 4BTA3.9 engine has an oil capacity of 10.4 liters.
The Cummins/Onan 4BTA3.9 has a displacement of 3.9 liters.
The Cummins/Onan 4BTA3.9 powers 3 generator set(s), including Cummins/Onan DGCA, Cummins/Onan DGCB, Cummins/Onan DGCG.