The Cummins/Onan 4B3.9-G2 is a 3.9 L 4-cylinder natural engine rated at 1500 rpm, producing up to 27 kW. It powers generator sets from Cummins/Onan, including the 35 DGBB, 40 DGBC, C40 D6 and C45D5. It holds 17.3 L (4.6 gal) of coolant.
Also known as: Cummins 4B3.9-G2
Part of the Cummins/Onan 4B3.9 engine family — 3 variants share parts & fitment.
| Coolant capacity | 17.3 L |
|---|---|
| Displacement | 3.9 L |
| Cylinders | 4 |
| Aspiration | Natural |
| Rated speed | 1500 rpm |
| Gross power | 27 kW |
| Part # | Description | Category |
|---|---|---|
| 928-0502B | other_service | |
| 928-0506 | other_service | |
| 960-0135 | other_service | |
| 960-0504A | other_service | |
| 960-0505 | other_service | |
| 960-12 | other_service |
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 4B3.9-G2 has a displacement of 3.9 liters with 4 cylinders.
The Cummins/Onan 4B3.9-G2 powers 6 generator set(s), including Cummins/Onan 35 DGBB, Cummins/Onan 40 DGBC, Cummins/Onan C40 D6, Cummins/Onan C45D5, Cummins/Onan DGBB.