The Cummins/Onan 6BTA5.9-F1 is a 5.88 L 6-cylinder turbocharged-aftercooled engine rated at 208 rpm, producing up to 136 kW. It powers generator sets from Cummins/Onan, including the FIREPUMP 6BTA5.9 F1. It holds 14.2 L (3.8 gal) of oil and 20.7 L (5.5 gal) of coolant.
Also known as: Cummins 6BTA5.9-F1
Part of the Cummins/Onan 6BTA5.9 engine family — 10 variants share parts & fitment.
| Oil capacity | 14.2 L |
|---|---|
| Coolant capacity | 20.7 L |
| Displacement | 5.88 L |
| Cylinders | 6 |
| Aspiration | Turbocharged-Aftercooled |
| Rated speed | 208 rpm |
| Gross power | 136 kW |
How to read your Cummins/Onan engine serial & model number →
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Fuel filter | 3903640 | Amazon $19.19 eBay $82.45 KuduParts $16.00 | |||
| Oil filter | — | ||||
| Battery | CCA | — | |||
| Oil | 0.25 U.S. gal | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Part # | Description | Category |
|---|---|---|
| 3824469 | fuel pump gear puller | fuel_pump |
| 3822509 | injector puller | injector |
| 3823276 | injector bore brush | injector |
| 3377259 | bosch timing tool (ve) | other_service |
| 3666496 | 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 6BTA5.9-F1 engine has an oil capacity of 14.2 liters.
The Cummins/Onan 6BTA5.9-F1 has a displacement of 5.88 liters with 6 cylinders.
The Cummins/Onan 6BTA5.9-F1 powers 1 generator set(s), including Cummins/Onan FIREPUMP 6BTA5.9 F1.