The Cummins/Onan 6B5.9 is a 5.9 L 6-cylinder turbocharged engine rated at 1800 rpm, producing up to 145 kW. It powers generator sets from Cummins/Onan, including the 6BTAA5.9-G7.
Also known as: Cummins 6B5.9
Part of the Cummins/Onan 6B5.9 engine family — 3 variants share parts & fitment.
| Displacement | 5.9 L |
|---|---|
| Cylinders | 6 |
| Aspiration | turbocharged |
| Rated speed | 1800 rpm |
| Gross power | 145 kW |
How to read your Cummins/Onan engine serial & model number →
Step-by-step procedures compiled from the Cummins/Onan service manual for this engine.
| Part # | Description | Category |
|---|---|---|
| 201-3434-01 | Diode, Positive (Forward) Includes Lead | Service part / kit |
| 201-3434-02 | Diode, Negative (Reverse) Includes Lead | Service part / kit |
| 509-0266-01 | Ring, O | Seal |
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 6B5.9 has a displacement of 5.9 liters with 6 cylinders.
The Cummins/Onan 6B5.9 powers 1 generator set(s), including Cummins/Onan 6BTAA5.9-G7.