The Cummins/Onan 4BTA3.9-G2 is a 3.9 L 4-cylinder after-cooled, turbo-charged engine rated at 1500 rpm. It powers generator sets from Cummins/Onan, including the 66 DGCC, 72 DGCC and C55 D5. It holds 11 L (2.9 gal) of oil and 8 L (2.1 gal) of coolant.
Also known as: CUMMINS 4BTA3.9-G2
Part of the Cummins/Onan 4BTA3.9 engine family — 5 variants share parts & fitment.
| Oil capacity | 11.0 L |
|---|---|
| Coolant capacity | 8.0 L |
| Displacement | 3.9 L |
| Cylinders | 4 |
| Aspiration | After-cooled, turbo-charged |
| Rated speed | 1500 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-G2 engine has an oil capacity of 11.0 liters.
The Cummins/Onan 4BTA3.9-G2 has a displacement of 3.9 liters with 4 cylinders.
The Cummins/Onan 4BTA3.9-G2 powers 3 generator set(s), including Cummins/Onan 66 DGCC, Cummins/Onan 72 DGCC, Cummins/Onan C55 D5.