The Cummins/Onan L9 is a 9 L 6-cylinder wastegate turbo engine rated at 2200 rpm, producing up to 275 kW. It powers generator sets from Cummins/Onan, including the L9 CoolPac. It holds 430 L (113.6 gal) of coolant.
Also known as: Cummins L9
Part of the Cummins/Onan L9 engine family — 5 variants share parts & fitment.
| Coolant capacity | 430.0 L |
|---|---|
| Displacement | 9.0 L |
| Cylinders | 6 |
| Aspiration | Wastegate Turbo |
| Rated speed | 2200 rpm |
| Gross power | 275 kW |
How to read your Cummins/Onan engine serial & model number →
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Fuel filter | 50,000 mi/80,000 km | — | 18 hr | ||
| Oil filter | Up to 50,000 mi/80,000 km | — | 18 hr | ||
| Battery | 150,000 mi/240,000 km | — | 48 hr | ||
| Belt | Maintenance free | — | |||
| Coolant | 60,000 mi/96,000 km | 2000.0 hours | — | 24 hr | |
| Oil | Up to 50,000 mi/80,000 km | 1500.0 hours | — | 18 hr |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| ELIMINATOR self cleaning filter core | Other | 1500 hr | Requires servicing only every 1,500 hours. Saves up to 90% of lube system maintenance costs and increases productivity. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Temperature | Aftertreatment low load operation | -25 | ºC | low load operation |
| Temperature | Cooling system LAT capability | 50 | ºC |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
The Cummins/Onan L9 has a displacement of 9.0 liters with 6 cylinders.
The Cummins/Onan L9 powers 1 generator set(s), including Cummins/Onan L9 CoolPac.
The Cummins/Onan L9 oil change interval is every 18 hours.