The Cummins/Onan QSB5-G3 is a 4.5 L 4-cylinder direct injection engine rated at 1500 rpm. It powers generator sets from MQ Power, including the EGS500C3. 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 — 6 variants share parts & fitment.
| Oil capacity | 12.1 L |
|---|---|
| Coolant capacity | 17.0 L |
| Displacement | 4.5 L |
| Cylinders | 4 |
| Aspiration | Direct injection |
| Rated speed | 1500 rpm |
How to read your Cummins/Onan engine serial & model number →
| Part # | Description | Category |
|---|---|---|
| 0179-3714 | Air Cleaner Instl | air_filter |
| 8C-3601 | Air Filter | air_filter |
| PI144D1 | Alternator Model | alternator |
| UC274C | Alternator Model | alternator |
| UC274K | Alternator Model | alternator |
| 127-0826 | Battery | battery |
| 153-5720 | 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 |
| 0100-3853-01 | Engine-Diesel (4ISBeG1) | other_service |
| 0179-3628 | Radiator Assy | other_service |
| 0179-4344 | Outlet Sockets Box Instl | other_service |
| 0179-4365 | Fuel System Instl | other_service |
| 0179-4466 | Circuit Breaker Assy | other_service |
| 0179-4472 | Heater Instl | other_service |
| 0179-4517 | Skid Assy (XRS) | other_service |
| 0179-4542 | Battery Isolator Assy | other_service |
| 0300-6029 | Accessory Instl | other_service |
| 0338-0000 | Harnesses | other_service |
| 0403-5265-02 | Spacer-Generator (UC274C) | other_service |
| 0403-5835-02 | Skid | other_service |
| 0403-5850-02 | Skid | other_service |
| 0403-5962 | End Cap-Skid | other_service |
| 0403-5966 | End Cap-Skid (Assy) | other_service |
| 0405-8842 | Enclosure | other_service |
| 3666496 | other_service | |
| V2403-M-E3BG | Engine Model | other_service |
| 250-0488 | Spark Plug | spark_plug |
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 1 generator set(s), including MQ Power EGS500C3.