The Cummins/Onan QSB7-G5 is a 6.69 L 6-cylinder turbocharged and charge air cooled engine rated at 1800 rpm, producing up to 242 kW. It powers generator sets from Cummins/Onan, including the C125 D6D, C150 D6D, C175 D6 and C200 D2R. It holds 17.4 L (4.6 gal) of oil and 22 L (5.8 gal) of coolant.
Also known as: Cummins QSB7-G5
Part of the Cummins/Onan QSB7 engine family — 8 variants share parts & fitment.
| Oil capacity | 17.4 L |
|---|---|
| Coolant capacity | 22.0 L |
| Displacement | 6.69 L |
| Cylinders | 6 |
| Aspiration | Turbocharged and charge air cooled |
| Rated speed | 1800 rpm |
| Gross power | 242 kW |
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.
| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Other | AC waveform Total Harmonic Distortion (THDV) | < 5% no load to full linear load, < 3% for any single harmonic | % | |
| Other | BMEP at set rated load | 2276 (330) / 2063 (299) | kPa (psi) | standby / prime |
| Other | Combustion Air | 15.86 (560) / 15.38 (543) | m3/min (scfm) | standby / prime |
| Other | Frequency regulation | Isochronous | ||
| Other | Governor regulation class | ISO8528 Part 1 Class G3 | ||
| Other | Random frequency variation | ± 0.50 | % | |
| Other | Telephone Harmonic Factor (THF) | < 3 | % | |
| Other | Telephone Influence Factor (TIF) | < 50 | per NEMA MG1-22.43 | |
| Pressure | Actual Exhaust Back Pressure with CPG Sound level 2 Enclosure Muffler | 10 (40.19) / 9.9 (39.78) | kPa (in H2O) | standby / prime |
| Pressure | Actual Exhaust Back Pressure with CPG Weather Enclosure Muffler | 8.4 (33.76) / 7.8 (31.47) | kPa (in H2O) | standby / prime |
| Pressure | Maximum Air Cleaner Restriction with Clean Filter | 3.7 (15) | kPa (in H2O) | clean filter |
| Pressure | Maximum Back Pressure | 10 (40.19) | kPa (in H2O) | standby and prime ratings |
| Pressure | Maximum Cooling Air Flow Static Restriction | 0.12 (0.5) | kPa (in H2O) | |
| Pressure | Maximum Fuel Inlet Restriction with Clean Filter | 127 (5.0) | mm Hg (in Hg) | clean filter |
| Speed | Overspeed limit | 2250 | rpm | |
| Speed | Piston Speed | 7.44 (1464) | m/s (ft/min) | |
| Speed | Rated Speed | 1800 | rpm | |
| Temperature | Exhaust Temperature | 512.22 (954) / 484.44 (904) | °C (°F) | standby / prime at set rated load |
| Temperature | Maximum Temperature Rise above 40 °C Ambient (single phase) | 120 | °C | 40 °C ambient |
| Temperature | Maximum Temperature Rise above 40 °C Ambient (three phase, BB94-2/BB95-2/BB92-2/BB85-2/BB93-2) | 105 | °C | 40 °C ambient |
| Voltage | Random voltage variation | ± 1.0 | % | |
| Voltage | Voltage regulation, no load to full load | ± 1.0 | % | no load to full load |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and 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 |
| PI144D1 | Alternator Model | Alternator |
| UC274C | Alternator Model | Alternator |
| UC274K | Alternator Model | Alternator |
| 0908-0110-00 | Health and Safety (Diesel Generator Sets) | Service part / kit |
| V2403-M-E3BG | Engine Model | Service part / kit |
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 17.4 liters.
The Cummins/Onan QSB7-G5 has a displacement of 6.69 liters with 6 cylinders.
The Cummins/Onan QSB7-G5 powers 8 generator set(s), including Cummins/Onan C125 D6D, Cummins/Onan C150 D6D, Cummins/Onan C175 D6, Cummins/Onan C200 D2R, Cummins/Onan C200 D6.