The Cummins/Onan QSB5-G3 is a 4.5 L 4-cylinder turbocharged, charge air cooled engine rated at 1800 rpm. It powers generator sets from Cummins/Onan and MQ Power, including the BCC 90-50 E3A, DSFAA, DSFAB and DSFAC. It holds 12.1 L (3.2 gal) of oil and 17 L (4.5 gal) of coolant.
Also known as: Cummins QSB5-G3
Part of the Cummins/Onan QSB5 engine family — 8 variants share parts & fitment.
| Oil capacity | 12.1 L |
|---|---|
| Coolant capacity | 17.0 L |
| Displacement | 4.5 L |
| Cylinders | 4 |
| Aspiration | turbocharged, charge air cooled |
| Rated speed | 1800 rpm |
Shared across brands: Cummins/Onan, MQ Power
| Part # | Description | Category |
|---|---|---|
| 8C-3601 | Air Filter | air_filter |
| 127-0826 | Battery | battery |
| 8C-3620 | Belt | belt |
| 8C-3600 | Coolant Filter | coolant_filter |
| 8C-3627 | Fuel Filter | fuel_filter |
| 101-4000 | Gasket | gasket |
| 250-0486 | Oil Filter | oil_filter |
| 250-0488 | Spark Plug | spark_plug |
| 153-5720 | Thermostat | thermostat |
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 QSB5-G3 engine has an oil capacity of 12.1 liters.
The Cummins/Onan QSB5-G3 has a displacement of 4.5 liters with 4 cylinders.
The Cummins/Onan QSB5-G3 powers 8 generator set(s), including Cummins/Onan BCC 90-50 E3A, Cummins/Onan DSFAA, Cummins/Onan DSFAB, Cummins/Onan DSFAC, Cummins/Onan DSFAD.