The Cummins/Onan B5.9-230G is a 5.9 L 6-cylinder engine rated at 2800 rpm, producing up to 172 kW. It powers generator sets from Cummins/Onan, including the B5.9-230. It holds 4 L (1.1 gal) of oil and 9.9 L (2.6 gal) of coolant.
Also known as: Cummins B5.9-230G
Part of the Cummins/Onan B5.9 engine family — 5 variants share parts & fitment.
| Oil capacity | 4.0 L |
|---|---|
| Coolant capacity | 9.9 L |
| Displacement | 5.9 L |
| Cylinders | 6 |
| Rated speed | 2800 rpm |
| Gross power | 172 kW |
How to read your Cummins/Onan engine serial & model number →
| Part # | Description | Category |
|---|---|---|
| RU5045 | Air Cleaner | Air filter |
| 4988274 | Alternator | Alternator |
| 3288689 | Belt | Belt |
| V70509 | Lube Oil | Fluid |
| FS1251/FF42000 | Fuel Filter | Fuel filter |
| 3822509 | Injection Pump Bore Brush Service Tool | Injector |
| LF3959 | Lube Filter | Lube filter |
| 12.001-3678-000 | Lubricating Oil Pressure Gauge | Service part / kit |
| 13.001-3901-000 | Battery A/B Switch | Service part / kit |
| 14.001-3912-000 | ON/OFF Switch (AUTO/MANUAL) | Service part / kit |
| 3305062 | Heater, 240V | Service part / kit |
| 3315032 | Heater, 120V | Service part / kit |
| 3824591 | Barring tool Rotate the engine | Service part / kit |
| 3885910 | Red Paint, Spray can | Service part / kit |
| 5.001-2674-000 | True Warning Light | Service part / kit |
| 6.001-3789-000 | Low Oil Pressure Warning Light | Service part / kit |
| 7.001-3890-000 | Circuit Breaker | Service part / kit |
| 8210G003-12VDC | 3/4" 12V solenoid | Service part / kit |
| 8210G3-24VDC | 3/4" 24V solenoid | Service part / kit |
| C2800 | Fleetguard® refractometer | Service part / kit |
| CC2800 | Fleetguard refractometer | Service part / kit |
| 3971603 | Starter 12V | Starter |
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 B5.9-230G engine has an oil capacity of 4.0 liters.
The Cummins/Onan B5.9-230G has a displacement of 5.9 liters with 6 cylinders.
The Cummins/Onan B5.9-230G powers 1 generator set(s), including Cummins/Onan B5.9-230.