Specifications
| Fuel | Turbocharged, After-cooled |
|---|---|
| Standby power | 1260 kW |
| Prime power | 1108 kW |
| Emissions | EPA NSPS Stationary Emergency Tier 2 |
| Oil capacity | 235.0 L |
| Alternator | 55A |
| Coolant capacity | 294 L |
| Max ambient | 53 °C |
| Dimensions (L×W×H) | 4674×2468×3100 mm |
| Dry weight | 7429 kg |
Filters & service parts
model family| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | ||||
| Fuel filter | Fleetguard® ES Filtration, CENTINEL™ | — | |||
| Oil filter | Fleetguard® ES Filtration, CENTINEL™ | — | 1500 hr | ||
| Battery | — | ||||
| Belt | — | ||||
| Coolant | CENTINEL Advanced Engine Oil Management System | — | |||
| Oil | Cummins Prelub System | — | |||
| Spark plug | — |
Compiled from this model's family documentation — may include parts for closely-related variants. Confirm the exact part for your serial number.
Service intervals
2| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| Lubricating oil | Test | 250 hr | 6 mo | First service — For high horsepower engines with Eliminator™ oil filter option: take oil samples every 250 hours and analyze per Cummins Engine Oil Recommendations Bulletin 3810340; repeat for at least three oil change intervals. |
| ELIMINATOR self cleaning filter core | Other | 1500 hr | Requires servicing only every 1,500 hours. Saves up to 90% of lube system maintenance costs and increases productivity. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Recommended fluids
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Engine oil | Cummins Engine Oil Recommendations Bulletin 3810340 | Used to analyze oil samples for high horsepower engines with Eliminator™ oil filter option. | |||
| Fuel | B100 biodiesel | ASTM D6751 | Must conform prior to blending; revised to include a cold soak test; stability requirement still in effect. | ||
| Fuel | B20 biodiesel blend | ASTM D7467 | Applies to biodiesel blends B6–B20; includes oxidation stability requirement; replaces Cummins' previous EMA B20 specification requirement. Must be purchased from a BQ9000 Certified Marketer; B100 must be sourced from a BQ9000 Accredited Producer. | ||
| Fuel | B5 biodiesel | All Cummins automotive and industrial engines are compatible with B5 biodiesel. | |||
| Fuel | biodiesel (Europe) | EN 14214 | Published by CEN, European Committee for Standardization. Equivalent biodiesel specifications required internationally. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Procedures
2Oil sampling for high horsepower engines with Eliminator™ oil filter option maintenance
- Take oil samples every 250 hours of operation.
- Analyze samples according to Cummins Engine Oil Recommendations Bulletin 3810340.
- Repeat for at least three oil change intervals to ensure consistent oil behavior.
Switching from petrodiesel to B20 on used engines maintenance
⚠ B20 has a solvent nature and may clean the vehicle fuel tank and lines.
- Install new fuel filters when switching to B20.
- Replace fuel filters at half the standard interval for the next two fuel filter changes.
- After the initial period, revert to intervals specified in the O & M manual.
- For EPA 2007 on-highway midrange engines, sample oil for the first 6 months to monitor fuel dilution.
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Common questions
What is the power rating of the Cummins/Onan QSK50?
The Cummins/Onan QSK50 is rated 1260 kW standby.
What fuel does the Cummins/Onan QSK50 use?
The Cummins/Onan QSK50 runs on Turbocharged, After-cooled.
What is the coolant capacity of the Cummins/Onan QSK50?
The Cummins/Onan QSK50 cooling system holds 294 liters (77.7 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
How much oil does the Cummins/Onan QSK50 take?
The Cummins/Onan QSK50 has an engine oil capacity of 235 liters (248.3 US quarts), per the manufacturer specification sheet.
What is the prime power rating of the Cummins/Onan QSK50?
The Cummins/Onan QSK50 is rated 1108 kW prime, against 1260 kW standby.
What is the dry weight of the Cummins/Onan QSK50?
The Cummins/Onan QSK50 has a dry weight of 7429 kg (16378 lb).
Which alternator is fitted to the Cummins/Onan QSK50?
The Cummins/Onan QSK50 uses a 55A alternator.
Parts
5| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 5394933 | Crankshaft Rear Oil Seal Removal & Installation Kit | Seal | Amazon eBay | |
| MCBQSK0068 | Water Pump Gasket Set | Gasket | Amazon eBay | |
| M-2885786 | Cylinder Liner Kit | Service part / kit | Amazon eBay | |
| M-3007525 | Cylinder Liner Kit | 1 | Service part / kit | Amazon eBay |
| M-3022157 | Cylinder Liner | 1 | Service part / kit | Amazon eBay |
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Fuel consumption
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Prime | 75% | 286.0 | 75.55 |
| Prime | 100% | 377.0 | 99.7 |
| Standby | 100% | 323.0 | 85.33 |
Available documents
This page was generated from the 13 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.