The Cummins/Onan QSK19 is a 19 L 6-cylinder air-to-air charge air cooled engine rated at 1800 rpm, producing up to 500 kW. It powers generator sets from Cummins/Onan, including the QSK19 series, QSK19-powered generator and qsk19. It holds 76 L (20.1 gal) of oil and 41.6 L (11.0 gal) of coolant.
Also known as: Cummins QSK19
Part of the Cummins/Onan QSK19 engine family — 7 variants share parts & fitment.
| Oil capacity | 76.0 L |
|---|---|
| Coolant capacity | 41.6 L |
| Displacement | 19.0 L |
| Cylinders | 6 |
| Aspiration | Air-to-air charge air cooled |
| Rated speed | 1800 rpm |
| Gross power | 500 kW |
How to read your Cummins/Onan engine serial & model number →
Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan QSK19.
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Fuel filter | Fuel filtration | — | 1500 hr | ||
| Oil filter | ELIMINATOR re-usable filter core | — | 1500 hr | ||
| Oil | Engine Oil w/ CENTINEL | — | 4500 hr |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| 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. |
| filters | Change | 1000 hr | with CENTINEL, depending on load factors | |
| 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. | |
| Overhead valve set | Adjust | 5000 hr | QSM, QSX and QSK19 | |
| fuel filter | Change | 1500 hr | Fleetguard NanoNet media | |
| engine oil | Change | 4500 hr | with CENTINEL, railway applications |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Clearance | Lower plunger diameter | 11 | mm | |
| Clearance | Lower plunger stroke | 10 | mm | |
| Clearance | Timing and upper plunger diameter | 15 | mm | |
| Clearance | Timing plunger separation (overtravel) maximum | 9 | mm | |
| Clearance | Timing plunger separation (overtravel) minimum | 2 | mm | |
| Clearance | Upper plunger travel for nose engagement | 5 | mm | |
| Other | DB9F-DB9M serial cable length (Part Number 4918418) | 1.83 | M | |
| Other | Extension DB9F to DB9M length (Part Number 3162851) | 30.48 | M | |
| Other | Fuel filter water separator element filtration rating | 10 | microns | |
| Other | Fuel rail actuator maximum flow rate | 1000 | pounds per hour | |
| Other | INLINE™5 datalink adapter current requirement | 250 | mA | at +8 VDC to +50 VDC |
| Other | Timing chamber pressure relative to injection pressure | 50 | % | |
| Other | Timing rail actuator maximum flow rate | 1500 | pounds per hour | |
| Other | Typical drain fuel flow rate | 2 | GPM | |
| Other | USB cable length (Part Number 4918419) | 2 | M | |
| Other | USB cable length (Part Number 4918591) | 5 | M | |
| Pressure | Cooling radiator maximum restriction | 5 | PSI | |
| Pressure | Cup pressure example | 25,000 | PSI | when timing chamber pressure is 12,500 PSI |
| Pressure | Fuel rail pressure maximum | 290 | psi | |
| Pressure | Fuel rail pressure minimum | 2 | psi | |
| Pressure | Future injector injection pressure capability | 35,000 | psi | |
| Pressure | Injection pressure (CELECT) | 22,500 | PSI | |
| Pressure | Injection pressure (PT) | 18,000 | PSI | |
| Pressure | Injection pressure (Quantum) | 25,000 | PSI | |
| Pressure | Maximum fuel inlet restriction at filters (clean filter) | 4 | inHg | |
| Pressure | Maximum fuel inlet restriction at filters (dirty filter) | 8 | inHg | |
| Pressure | Timing chamber pressure example | 12,500 | PSI | when cup pressure is 25,000 PSI |
| Temperature | Fuel cooler thermostat closed temperature | 89 | °F | |
| Temperature | Fuel cooler thermostat fully opened temperature | 104 | °F | |
| Temperature | Fuel cooler thermostat starts to open temperature | 90 | °F | |
| Voltage | INLINE™5 datalink adapter supply voltage (maximum) | +50 | VDC | power lamp fast flashing indicates greater than maximum |
| Voltage | INLINE™5 datalink adapter supply voltage (minimum) | +8 | VDC | power lamp slow flashing indicates less than minimum |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| 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.
| Code | Name | Meaning | Severity | Action |
|---|---|---|---|---|
| 451 | Example fault code used to demonstrate flash code sequence |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
⚠ A fully populated USB cable, Part Number 4918419, or DB9F-DB9M serial cable, Part Number 4918418, must be used.
⚠ B20 has a solvent nature and may clean the vehicle fuel tank and lines.
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 |
|---|---|---|
| M-4352582 | Upper Gasket Set | gasket |
| M-4352587 | Upper Gasket Set | gasket |
| M-3081837 | Head Bolt – QSK19 | head_bolt |
| 9001-01 | IMPELLER | impeller |
| 870-2054 | Nut, Flanged Locking (M6) | nut |
| 3007525 | Liner Kit STD | other_service |
| 3012611 | Liner Kit +.010" UPF | other_service |
| 3012612 | Liner Kit +.020" UPF | other_service |
| 3022157 | Cylinder Liner STD | other_service |
| 3023017 | Cylinder Liner +.010" UPF | other_service |
| 3023018 | Cylinder Liner +.020" UPF | other_service |
| 3023019 | Cylinder Liner +.030" UPF | other_service |
| 3023020 | Cylinder Liner +.040" UPF | other_service |
| 3096680 | Piston STC 13.8:1 Ratio | other_service |
| 3096681 | Piston KT Series 15.5:1 Ratio | other_service |
| 3096682 | Piston KTA Series 14.5:1 Ratio | other_service |
| 3096683 | Piston 13.5:1 Ratio | other_service |
| 3096684 | Piston KTA 15.7:1 Ratio | other_service |
| 3096685 | Piston STC 13.9:1 Ratio | other_service |
| 3628731 | Piston STC Kit | other_service |
| 3630913 | Piston KTA-50-G7 | other_service |
| 3631241 | Piston Kit STC 13.9:1 Ratio | other_service |
| 3631242 | Piston Kit 13.5:1 Ratio | other_service |
| 3631243 | Piston Kit KTA 15.7:1 Ratio | other_service |
| 3631244 | Piston Kit KTA Series 14.5:1 Ratio | other_service |
| 3631245 | Piston Kit KT Series 15.5:1 Ratio | other_service |
| 3631246 | Piston Kit STC 13.8:1 Ratio | other_service |
| 3801268 | Liner Kit +.030" UPF | other_service |
| 3801269 | Liner Kit +.040" UPF | other_service |
| 3803530 | Piston Assembly STC | other_service |
| 3804747 | Piston Kit KTA-50-G7 | other_service |
| 3804885 | Piston KTA-50-G8/G9 | other_service |
| 4009220 | Cylinder Liner QSK19/KT19 STD | other_service |
| 4009221 | Cylinder Liner +.020" UPF | other_service |
| 4009222 | Cylinder Liner +.040" UPF | other_service |
| 4009227 | Cylinder Liner KT19 Block Type #2 | other_service |
| 4009233 | Cylinder Liner +.060" UPF | other_service |
| 4024767 | Cylinder Liner Kit QSK19/KT19 STD | other_service |
| 4024768 | Cylinder Liner Kit +.020" UPF | other_service |
| 4024769 | Cylinder Liner Kit +.040" UPF | other_service |
| 4024770 | Cylinder Liner Kit KT19 Block Type #2 | other_service |
| 4024775 | Cylinder Liner Kit +.060" UPF | other_service |
| 4089847 | Piston Kit GTA38/19 | other_service |
| 4090013 | Piston Kit KTA-38-M2 | other_service |
| 4090029 | Piston Kit QSK19CE | other_service |
| 4090181 | Piston GTA38/19 | other_service |
| 4097889 | Piston KTA-38-M2 | other_service |
| 4333987 | Cylinder Liner +.020" / +.020" | other_service |
| 4333988 | Cylinder Liner +.060" / +.020" | other_service |
| 4333989 | Cylinder Liner +.060" / STD | other_service |
| 4333991 | Cylinder Liner QSK19 STD/STD | other_service |
| 4371771 | Cylinder Liner Kit +.020" / +.020" | other_service |
| 4371772 | Cylinder Liner Kit +.060" / +.020" | other_service |
| 4371773 | Cylinder Liner Kit +.060" / STD | other_service |
| 4371779 | Cylinder Liner Kit QSK19 STD/STD | other_service |
| 4910463 | Piston QSK19R/M | other_service |
| 4910465 | Piston QSK Series | other_service |
| 4916177 | Piston GTA/GQSK19 | other_service |
| 4918058 | Piston QSK19CE | other_service |
| 4922319 | Piston QSK19C | other_service |
| 4955233 | Piston Kit QSK19R/M | other_service |
| 4955235 | Piston Kit QSK Series | other_service |
| 4955236 | Piston Kit QSK19C | other_service |
| 4955238 | Piston Kit GTA/GQSK19 | other_service |
| 526-0100 | Washer, Flat (9/16' ID x | other_service |
| 800-0093 | Screw, Hex Head | other_service |
| 800-0094 | Screw, Cap – Hex Head (1/2–13 x 2") | other_service |
| 821-2096-03 | Screw, Flange Head Lock | other_service |
| 821-6003-02 | Screw, Cap - Hex Head | other_service |
| 851-0023 | Conical Disc Spring(l/2) | other_service |
| 862-0016 | Nut, Hex | other_service |
| A040A357 | Panel, Cover | other_service |
| A040B391 | Busbar, Ground | other_service |
| A040J745 | Bracket | other_service |
| A041A931 | Busbar, Copper | other_service |
| A041Z271 | Panel, Terminal | other_service |
| A042X594 | Busbar, Copper | other_service |
| A043K271 | Box, Circuit Breaker | other_service |
| BER0005 | BEARING | other_service |
| BER0020 | BEARING | other_service |
| CAMSET0019 | CAM LINER(BRONZE) | other_service |
| JSK0069 | SERVICE KIT | other_service |
| QSK19 | Fuel System | other_service |
| SHA0088 | SHAFT | other_service |
| 4308809 | Flat Seal for Cylinder Liner | seal |
| 4333984 | D-Type Seal Liner | seal |
| 4371769 | Seal Kit | seal |
| 4371770 | D-Type Seal Kit | seal |
| MCSSET0006 | M-SEAL | seal |
| 338-4386 | Harness, Meter | wiring |
| A029G375 | Harness, Relay | wiring |
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 QSK19 engine has an oil capacity of 76.0 liters.
The Cummins/Onan QSK19 has a displacement of 19.0 liters with 6 cylinders.
The Cummins/Onan QSK19 powers 3 generator set(s), including Cummins/Onan QSK19 series, Cummins/Onan QSK19-powered generator, Cummins/Onan qsk19.
The Cummins/Onan QSK19 oil change interval is every 4500 hours.
A commonly reported issue on generators using the Cummins/Onan QSK19 is: WARNING (yellow) lamp flashing once followed by STOP (red) lamp flashing the three digit fault code 451.