The Cummins/Onan QSK78-G9 is a 78 L 18-cylinder turbocharged and low temperature after-cooled engine rated at 1500 rpm, producing up to 2304 kW. It powers generator sets from Cummins/Onan, including the C3000 D5.
Part of the Cummins/Onan QSK78 engine family — 7 variants share parts & fitment.
| Displacement | 78.0 L |
|---|---|
| Cylinders | 18 |
| Aspiration | Turbocharged and low temperature after-cooled |
| Rated speed | 1500 rpm |
| Gross power | 2304 kW |
| Part # | Description | Category |
|---|---|---|
| A049E248 | Shim (Used with W or X Alternator Cores with Double Stacked Bus Bar) | alternator |
| 0098-6943 | Label, Warning | other_service |
| 0130-7270 | Spacer | other_service |
| 0300-6315-02 | Display, Control | other_service |
| 0300-6366-02 | Display, Control | other_service |
| 0305-1009 | Suppressor, Voltage | other_service |
| 0307-2874 | Relay, Control | other_service |
| 0307-3003-01 | Relay, Ground Fault | other_service |
| 0327-1536 | Card, Input Output | other_service |
| 0332-1389 | Tie, Cable (Bearing RTD) | other_service |
| 0332-1794 | Tie, Cable | other_service |
| 0332-4106 | Mount, Cable Tie | other_service |
| 0332-4145 | Rail, Terminal Block | other_service |
| 0332-4320 | Block, Terminal | other_service |
| 0406-0930 | Latch, Door | other_service |
| 0517-0138-08 | Plug, Hole | other_service |
| 0518-0548-46 | Clamp | other_service |
| 306-5319-02 | Shield, Bus | other_service |
| 306-5320-02 | Shield, Bus | other_service |
| 315-1605-01 | Transformer, Current | other_service |
| 315-1621 | Transformer- Current | other_service |
| 315-1622 | Bracket, Transformer - Current | other_service |
| 315-1668-01 | Transformer, Current 9090:1 (380-480V) | other_service |
| 315-1668-02 | Transformer, Current 8000:1 (600V) | other_service |
| 315-1673 | Transformer, Current (Support) | other_service |
| 315-1687-01 | Transformer, Current 1150:1 (4160V) | other_service |
| 315-1687-04 | Transformer, Current 350:1 (12470-13800V) | other_service |
| 315-1691-02 | Transformer, Current (5500:5) | other_service |
| 315-1692-01 | Transformer, Current 200:5 | other_service |
| 315-1692-09 | Transformer, Current 600:5 | other_service |
| 319-5970 | Bracket | other_service |
| 319-6586 | Member, Mounting | other_service |
| 332-0942 | Tie, Cable | other_service |
| 332-1389 | Tie, Cable | other_service |
| 332-1794 | Tie, Cable | other_service |
| 332-2420 | Mount, Cable Tie | other_service |
| 332-3102 | Tie, Cable | other_service |
| 332-3388 | Tie, Cable | other_service |
| 332-4044 | Jumper, Terminal | other_service |
| 332-4152 | Clamp | other_service |
| 338-4386 | Harness, Meter | other_service |
| 338-4818 | Harness, AC | other_service |
| 338-5072 | Harness, AC | other_service |
| 518-0515 | Clip, Wire | other_service |
| 518-0548-58 | Clamp | other_service |
| 908-0600 | Cummins QSK78 Series Engine Operation and Maintenance Manual | other_service |
| A029G676 | Label, Information | other_service |
| A029P569 | Card, Control | other_service |
| A040C763 | Fuse, Fast Acting | other_service |
| A040E738 | Busbar, Ground | other_service |
| A040J745 | Bracket | other_service |
| A040J770 | Busbar, Ground | other_service |
| A040S361 | Harness, Relay | other_service |
| A042N858 | Clamp, Cable | other_service |
| A042N860 | Tie, Cable | other_service |
| A042Y991 | Clamp, Cable | other_service |
| A043L028 | Switch, Pushbutton | other_service |
| A049E245 | Shim 12 Gauge | other_service |
| A049E247 | Shim 10 Gauge | other_service |
| A049E249 | Shim 6 Gauge | other_service |
| A049U915 | Alarm, Audible | other_service |
| A049Y119 | Heater, Control | other_service |
| A050J163 | Harness, Relay | other_service |
| A050J165 | Harness, Heater | other_service |
| A050P662 | Harness, Relay | other_service |
| A050R646 | Harness, Wiring (Stator RTD) | other_service |
| A050T187 | Harness, Alternating Current | other_service |
| A050T696 | Harness, Wiring | other_service |
| A050W834 | Harness, Alternating Current | other_service |
| A051D021 | Harness, Engine | other_service |
| A051F854 | Holder, Fuse | other_service |
| A051G439 | Harness, Wiring (Stator RTD) | other_service |
| A051G461 | Harness, Wiring (Bearing RTD) | other_service |
| A051H785 | Charger, Battery | other_service |
| A051K118 | Stand, Control Box | other_service |
| A052C354 | Door, Control | other_service |
| A052J051 | Bracket, Harness | other_service |
| A052J735 | Sleeve, Heat Shrink | other_service |
| A053L186 | Harness, Wiring | other_service |
| A053L315 | Meter, Hour | other_service |
| A053L592 | Door, Control | other_service |
| A066W904 | Harness, Wiring (Stator RTD) | other_service |
| APCH-1007-12 | Bulletin 5600277 | other_service |
| A052C659 | Seal, Weather | seal |
| A052C714 | Seal, Cable | seal |
| A052C716 | Seal, Cable | seal |
| 0193-0446-03 | Sender, Exhaust Gas Temperature | sensor |
| A048N280 | Sensor, Temperature - Battery Charger | sensor |
| A050V587 | Harness, Sensor | 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 QSK78-G9 has a displacement of 78.0 liters with 18 cylinders.
The Cummins/Onan QSK78-G9 powers 1 generator set(s), including Cummins/Onan C3000 D5.