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.
Part of the Cummins/Onan 4BTA3.9 engine family — 4 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 |
|---|---|---|
| 012046 | Air Cleaner | air_filter |
| 012040 | Battery | battery |
| 012041 | Fan Belt | belt |
| 012045 | Coolant Overflow Reservoir | coolant_filter |
| 2.4L | Engine | engine |
| 012044 | Oil Drain Hose | fluid |
| 012042 | Oil Filter | oil_filter |
| 012043 | Oil Fill Cap | oil_filter |
| A046K020 | Oil Filter | oil_filter |
| 0L2090-C | 60 kW (2.4 L) | 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 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.