The Cummins/Onan QSK50 series is a 50.3 L 16-cylinder turbocharged, after-cooled engine rated at 1900 rpm. It powers generator sets from Cummins/Onan, including the D-3519, D-3521, D-3523 and D-3524. It holds 204 L (53.9 gal) of oil and 161 L (42.5 gal) of coolant.
Also known as: Cummins QSK50 series
Part of the Cummins/Onan QSK50 engine family — 7 variants share parts & fitment.
| Oil capacity | 204.0 L |
|---|---|
| Coolant capacity | 161.0 L |
| Displacement | 50.3 L |
| Cylinders | 16 |
| Aspiration | Turbocharged, After-cooled |
| Rated speed | 1900 rpm |
| Part # | Description | Category |
|---|---|---|
| 140-3230 | Cleaner, Air - Heavy Duty | air_filter |
| 140-3963 | Filter, Air | 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 | Element, Replacement (Cummins Filtration Part Number) | 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 |
| 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 | other_service |
| 140-1260 | Fitting, Safety Filter | other_service |
| 6794600 | Washer, Sealing | seal |
| 140-1548 | Indicator, Service | sensor |
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 series engine has an oil capacity of 204.0 liters.
The Cummins/Onan QSK50 series has a displacement of 50.3 liters with 16 cylinders.
The Cummins/Onan QSK50 series powers 8 generator set(s), including Cummins/Onan D-3519, Cummins/Onan D-3521, Cummins/Onan D-3523, Cummins/Onan D-3524, Cummins/Onan DQGAA.