The Cummins/Onan 4BTAA3.9-G4 is a 3.9 L 4-cylinder turbocharged, charge air cooled engine rated at 1500 rpm. It powers generator sets from Cummins/Onan, including the B3.9 Series. It holds 16 L (4.2 gal) of oil and 19 L (5.0 gal) of coolant.
Also known as: Cummins® 4BTAA3.9-G4
| Oil capacity | 16.0 L |
|---|---|
| Coolant capacity | 19.0 L |
| Displacement | 3.9 L |
| Cylinders | 4 |
| Aspiration | Turbocharged, Charge Air Cooled |
| Rated speed | 1500 rpm |
How to read your Cummins/Onan engine serial & model number →
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Fuel filter | Spin on fuel filter | — | |||
| Oil filter | Full flow spin on lube oil filter | — | |||
| Oil | CI4+ 15W40 | 16.0 l | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
The Cummins/Onan 4BTAA3.9-G4 engine has an oil capacity of 16.0 liters.
The Cummins/Onan 4BTAA3.9-G4 has a displacement of 3.9 liters with 4 cylinders.
The Cummins/Onan 4BTAA3.9-G4 powers 1 generator set(s), including Cummins/Onan B3.9 Series.