The Cummins/Onan QSB7-G5 is a 6.69 L 6-cylinder turbocharged engine rated at 1800 rpm. It powers generator sets from Cummins/Onan, including the C125 D6D, C150 D6D, C175 D6 and C200 D2R. It holds 18.9 L (5.0 gal) of oil and 26.95 L (7.1 gal) of coolant.
Also known as: Cummins QSB7-G5
Part of the Cummins/Onan QSB7 engine family — 7 variants share parts & fitment.
| Oil capacity | 18.9 L |
|---|---|
| Coolant capacity | 26.95 L |
| Displacement | 6.69 L |
| Cylinders | 6 |
| Aspiration | turbocharged |
| Rated speed | 1800 rpm |
How to read your Cummins/Onan engine serial & model number →
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Filter, Air − Normal Duty | A047M180 | Amazon eBay $248.27 | ||
| Fuel filter | — | 500 hr | |||
| Oil filter | — | 1000 hr | |||
| Battery | Battery Isolator- Genset Power system battery cut off switch, Ensuring greater protection and easy serviceability during maintenance | — | |||
| Belt | — | 1000 hr | |||
| Coolant | 26.95 | — | |||
| Oil | 18.9 | — | |||
| Spark plug | — | 500 hr |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Part # | Description | Category |
|---|---|---|
| A047M180 | Filter, Air − Normal Duty | air_filter |
| A054E584 | Filter, Air − Heavy Duty | air_filter |
| A055Z870 | Filter, Air − Replacement − Heavy Duty | air_filter |
| 4915973 | Alternator Manual | alternator |
| 0908-0110-00 | Health and Safety (Diesel Generator Sets) | other_service |
| 518-0601 | Sealant, Thread (6 ml Tube) | other_service |
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 QSB7-G5 engine has an oil capacity of 18.9 liters.
The Cummins/Onan QSB7-G5 has a displacement of 6.69 liters with 6 cylinders.
The Cummins/Onan QSB7-G5 powers 9 generator set(s), including Cummins/Onan C125 D6D, Cummins/Onan C150 D6D, Cummins/Onan C175 D6, Cummins/Onan C200 D2R, Cummins/Onan C200 D6.