The Cummins/Onan 4BT3.3 series is a 3.3 L 4-cylinder naturally aspirated engine. It powers generator sets from Cummins/Onan, including the C50 D6 and C55 D5.
Also known as: Cummins 4BT3.3 series
Part of the Cummins/Onan 4BT3.3 engine family — 3 variants share parts & fitment.
| Displacement | 3.3 L |
|---|---|
| Cylinders | 4 |
| Aspiration | naturally aspirated |
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Heavy Duty air filter | — | find | ||
| Fuel filter | Spin on fuel filters with water separator | — | find | ||
| Oil filter | — | find | |||
| Belt | — | find | |||
| Coolant | 7.2 l | — | |||
| Oil | 10.9 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 4BT3.3 series has a displacement of 3.3 liters with 4 cylinders.
The Cummins/Onan 4BT3.3 series powers 2 generator set(s), including Cummins/Onan C50 D6, Cummins/Onan C55 D5.