The Cummins/Onan QSX15 is a 15 L 6-cylinder turbocharged engine rated at 1800 rpm. It powers generator sets from Cummins/Onan, including the QSX15-G11, QSX15-G12 and QSX15-G13.
Part of the Cummins/Onan QSX15 engine family — 6 variants share parts & fitment.
| Displacement | 15.0 L |
|---|---|
| Cylinders | 6 |
| Aspiration | turbocharged |
| Rated speed | 1800 rpm |
| Code | Meaning |
|---|---|
| OS | Overspeed |
| LOP | Low Oil Pressure |
| HET | High Engine Temperature |
| Fault 1 | High Engine Temperature Shutdown |
Fault codes and symptom→remedy steps extracted from this engine’s service/owner documentation; verify against the official manual before servicing.
| Part # | Description | Category |
|---|---|---|
| M-4376220 | Upper Gasket Set | gasket |
| M-4376221 | Lower Gasket Set | gasket |
| 3163156 | Service cable for InPower™ | other_service |
| 3822735 | Plastic bead media | other_service |
| 3886301 | InPower™ electronic service tool | other_service |
| 956-0120 | other_service | |
| 956-0220 | other_service | |
| 960-0132 | other_service | |
| 960-0174B | other_service | |
| TB3-5 | Generator Set Control Panel Terminal Block | other_service |
| TB3-6 | Generator Set Control Panel Terminal Block | other_service |
| M-5473087 | Piston Kit | piston_kit |
| M-5484414 | Piston Pin | piston_pin |
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 QSX15 has a displacement of 15.0 liters with 6 cylinders.
The Cummins/Onan QSX15 powers 6 generator set(s), including Cummins/Onan QSX15, Cummins/Onan QSX15-G11, Cummins/Onan QSX15-G12, Cummins/Onan QSX15-G13, Cummins/Onan QSX15-G14.