The Cummins/Onan QSJ2.4 is a 2.4 L 4-cylinder naturally aspirated or turbocharged (varies by generator set model) engine rated at 1800 rpm. It powers generator sets from Cummins/Onan, including the C20 N6, C22 N6, C25 N6 and C30 N6. It holds 12.8 L (3.4 gal) of coolant.
Also known as: Cummins QSJ2.4
| Coolant capacity | 12.8 L |
|---|---|
| Displacement | 2.4 L |
| Cylinders | 4 |
| Aspiration | Naturally aspirated or turbocharged (varies by generator set model) |
| Rated speed | 1800 rpm |
How to read your Cummins/Onan engine serial & model number →
Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan QSJ2.4.
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Fuel filter | Every 500 hours of operation or as needed, whichever comes first | — | 500 hr | ||
| Oil filter | Every 1000 hours of operation or as needed, whichever comes first | — | 1000 hr | ||
| Battery | As needed | — | |||
| Oil | 500 miles or 6 months, whichever comes first | — | 804 hr |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Clearance | Minimum to combustible walls (front) | 915 | mm | installation |
| Clearance | Minimum to combustible walls (side) | 1524 | mm | installation |
| Clearance | Minimum to combustible walls (top) | 762 | mm | installation |
| Pressure | Fuel supply pressure - maximum | 3.5 | kPa | |
| Pressure | Fuel supply pressure - minimum | 1.5 | kPa |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Coolant | 50/50 | 50/50 ethylene glycol/water mixture | |||
| Coolant | 50/50 mixture | below 50°C |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Voltage | Phase | Connection | Leads | Notes |
|---|---|---|---|---|
| 120/208 | 3 | 12-lead | 12 | |
| 120/240 | 1 | 4-lead | 4 | |
| 120/240 | 3 | 12-lead | 12 |
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 QSJ2.4 has a displacement of 2.4 liters with 4 cylinders.
The Cummins/Onan QSJ2.4 powers 20 generator set(s), including Cummins/Onan C20 N6, Cummins/Onan C22 N6, Cummins/Onan C25 N6, Cummins/Onan C30 N6, Cummins/Onan C36 N6.
The Cummins/Onan QSJ2.4 oil change interval is every 804 hours.
A commonly reported issue on generators using the Cummins/Onan QSJ2.4 is: Fire Hazard. Cause: Contaminated insulation is a fire hazard.. Fix: Remove any contaminated insulation and dispose of it in accordance with local regulations..