The Cummins/Onan 4BTA3.9G2 is a 3.92 L 4-cylinder turbocharged engine rated at 1800 rpm. It powers generator sets from Cummins/Onan, including the 66 DGCC and C55 D5. It holds 9.5 L (2.5 gal) of oil and 21 L (5.5 gal) of coolant.
Also known as: Cummins 4BTA3.9G2
| Oil capacity | 9.5 L |
|---|---|
| Coolant capacity | 21.0 L |
| Displacement | 3.92 L |
| Cylinders | 4 |
| Aspiration | Turbocharged |
| Rated speed | 1800 rpm |
How to read your Cummins/Onan engine serial & model number →
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | 0140-3765 | Amazon eBay | |||
| Fuel filter | — | ||||
| Oil filter | — | ||||
| Battery | — | ||||
| Belt | — | ||||
| Coolant | 21.0 L | — | |||
| Oil | 11.0 L | — | |||
| Spark plug | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
The Cummins/Onan 4BTA3.9G2 engine has an oil capacity of 9.5 liters.
The Cummins/Onan 4BTA3.9G2 has a displacement of 3.92 liters with 4 cylinders.
The Cummins/Onan 4BTA3.9G2 powers 2 generator set(s), including Cummins/Onan 66 DGCC, Cummins/Onan C55 D5.