The Cummins/Onan QSK78 is a 78 L 18-cylinder turbo charged and low temperature after-cooled engine rated at 1800 rpm, producing up to 2461 kW. It powers generator sets from Cummins/Onan, including the C2750 D5, C3000 D5, DQLE and DQLF. It holds 312 L (82.4 gal) of oil.
Also known as: Cummins QSK78
Part of the Cummins/Onan QSK78 engine family — 7 variants share parts & fitment.
| Oil capacity | 312.0 L |
|---|---|
| Displacement | 78.0 L |
| Cylinders | 18 |
| Aspiration | Turbo charged and low temperature after-cooled |
| Rated speed | 1800 rpm |
| Gross power | 2461 kW |
| Part # | Description | Category |
|---|---|---|
| 0140-3963 | Filter, Air - Standard Duty | air_filter |
| A034R952 | Filter, Air - Heavy Duty | air_filter |
| A034R957 | Element, Primary - Heavy Duty | air_filter |
| A034R963 | Secondary, Primary - Heavy Duty | air_filter |
| 908-0600 | Cummins QSK78 Series Engine Operation and Maintenance Manual | other_service |
| A041X654 | Element, Replacement - Crankcase Breather | other_service |
| APCH-1007-12 | Bulletin 5600277 | 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 QSK78 engine has an oil capacity of 312.0 liters.
The Cummins/Onan QSK78 has a displacement of 78.0 liters with 18 cylinders.
The Cummins/Onan QSK78 powers 5 generator set(s), including Cummins/Onan C2750 D5, Cummins/Onan C3000 D5, Cummins/Onan DQLE, Cummins/Onan DQLF, Cummins/Onan QSK78 series.