The Cummins/Onan QSK50-G5 is a 50 L 16-cylinder turbocharged, after-cooled engine rated at 1800 rpm. It powers generator sets from Cummins/Onan, including the DQGAE and DQGAF. It holds 234.7 L (62.0 gal) of oil and 401 L (105.9 gal) of coolant.
Also known as: Cummins QSK50-G5
Part of the Cummins/Onan QSK50 engine family — 12 variants share parts & fitment.
| Oil capacity | 234.7 L |
|---|---|
| Coolant capacity | 401.0 L |
| Displacement | 50.0 L |
| Cylinders | 16 |
| Aspiration | Turbocharged, After-cooled |
| Rated speed | 1800 rpm |
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 |
|---|---|---|
| 140-3230 | Cleaner, Air (Includes Elements - See Ref. No. 25 and 26) | Air filter |
| 140-3963 | Cleaner, Air (Spec A-C Metal) | Air filter |
| 70781N | Element, Primary - Air Cleaner - Nelson - Heavy Duty | Air filter |
| 70782N | Element, Safety - Air Cleaner - Nelson - Heavy Duty | Air filter |
| AF25544 | Element, Primary - Air Cleaner - Fleetguard - Heavy Duty | Air filter |
| AF25545 | Element, Safety - Air Cleaner - Fleetguard - Heavy Duty | Air filter |
| AF2559300 | Air Cleaner replacement element (Nelson), for Air Cleaner Housing 140-3737 | Air filter |
| 149-2792 | Filter, Fuel | Fuel filter |
| 149-2837 | Filter, Fuel | Fuel filter |
| 149-2853 | Filter, Fuel (Triplex Filter) | Fuel filter |
| 543-0088 | Package, Fuel Filter | Fuel filter |
| A030M222 | Filter, Fuel (Triple Filter) | Fuel filter |
| MCBQSK0068 | Water Pump Gasket Set | Gasket |
| 501-0970-01 | Line, Fuel | Hose |
| 503-1705 | Hose, Hump | Hose |
| 503-2754-01 | Hose, Oil | Hose |
| 503-2754-02 | Hose, Oil | Hose |
| 102-1335 | Plug, Oil Drain | Service part / kit |
| 140-1260 | Fitting, Safety Filter | Service part / kit |
| 140-1548 | Indicator, Service | Service part / kit |
| M-2885786 | Cylinder Liner Kit | Service part / kit |
| M-3007525 | Cylinder Liner Kit | Service part / kit |
| M-3022157 | Cylinder Liner | Service part / kit |
| 5394933 | Crankshaft Rear Oil Seal Removal & Installation Kit | Seal |
| 6794600 | Washer, Sealing | Seal |
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 QSK50-G5 engine has an oil capacity of 234.7 liters.
The Cummins/Onan QSK50-G5 has a displacement of 50.0 liters with 16 cylinders.
The Cummins/Onan QSK50-G5 powers 3 generator set(s), including Cummins/Onan DQGAE, Cummins/Onan DQGAF, Cummins/Onan QSK50-G5.