The Cummins/Onan C40 N6 is a 2.4 L 4-cylinder turbo with after cooler engine rated at 1800 rpm. It powers generator sets from Cummins/Onan, including the RS 40.
Also known as: Cummins C40 N6
| Displacement | 2.4 L |
|---|---|
| Cylinders | 4 |
| Aspiration | Turbo with after cooler |
| Rated speed | 1800 rpm |
How to read your Cummins/Onan engine serial & model number →
| Code | Meaning |
|---|---|
| Code 143 | Engine Oil Pressure Low (Warning) |
| Code 146 | Engine Coolant Temperature Above Normal (Warning) |
| Code 151 | Engine Coolant Temperature High (Shutdown) |
| Symptom | Cause | Remedy |
|---|---|---|
| Any spillage that occurs during fueling or during oil top-off or oil change must be cleaned up before starting the generator set. | Clean up any spillage before starting the generator set. | |
| Fire Hazard | Contaminated insulation is a fire hazard. | Remove any contaminated insulation and dispose of it in accordance with local regulations. |
Fault codes and symptom→remedy steps extracted from this engine’s service/owner documentation; verify against the official manual before servicing.
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | ||||
| Fuel filter | — | ||||
| Oil filter | — | ||||
| Battery | — | ||||
| Belt | — | ||||
| Coolant | — | ||||
| Oil | — | ||||
| Spark plug | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
Step-by-step procedures compiled from the Cummins/Onan service manual for this engine.
The Cummins/Onan C40 N6 has a displacement of 2.4 liters with 4 cylinders.
The Cummins/Onan C40 N6 powers 1 generator set(s), including Cummins/Onan RS 40.