The Cummins/Onan QSK78-G8 is a 78 L 18-cylinder turbocharged, after-cooled engine rated at 1800 rpm. It powers generator sets from Cummins/Onan and Everdigm, including the EDG-2750C. It holds 465 L (122.8 gal) of oil.
Also known as: Cummins QSK78-G8
Part of the Cummins/Onan QSK78 engine family — 9 variants share parts & fitment.
| Oil capacity | 465.0 L |
|---|---|
| Displacement | 78.0 L |
| Cylinders | 18 |
| Aspiration | Turbocharged, After-cooled |
| Rated speed | 1800 rpm |
Shared across brands: Cummins/Onan, Everdigm
How to read your Cummins/Onan engine serial & model number →
| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| valve clearance | Check | 2000 hr | B-Series (4BT3.3): valve clearance checks not required for 2000 hours, twice the industry standard | |
| engine overhaul | Other | 20000 hr | QSK23-Series: expected life cycle to 20,000 hours before first overhaul |
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 |
|---|---|---|
| 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 |
| 5572840 | Cylinder Head Lifting Handle Kit | Service part / kit |
| 5573037 | Camshaft Removal & Installation Kit | Service part / kit |
| 908-0600 | Cummins QSK78 Series Engine Operation and Maintenance Manual | Service part / kit |
| A041X654 | Element, Replacement - Crankcase Breather | Service part / kit |
| APCH-1007-12 | Bulletin 5600277 | 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 QSK78-G8 engine has an oil capacity of 465.0 liters.
The Cummins/Onan QSK78-G8 has a displacement of 78.0 liters with 18 cylinders.
The Cummins/Onan QSK78-G8 powers 2 generator set(s), including Cummins/Onan QSK78-G8, Everdigm EDG-2750C.