Cummins/Onan QSM11G4 Engine
The Cummins/Onan QSM11G4 is a 10.8 L 6-cylinder turbocharged, egr and cac engine rated at 1800 rpm, producing up to 350 kW. It powers generator sets from Cummins/Onan and Terex, including the DQHAA, DQHAB, DQHAB-6515690 and DQHAB-7229336. It holds 36.72 L (9.7 gal) of oil and 33.7 L (8.9 gal) of coolant.
Also known as: CUMMINS QSM11G4
Part of the Cummins/Onan QSM11G4 engine family — 2 variants share parts & fitment.
Engine specifications
| Oil capacity | 36.72 L |
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| Coolant capacity | 33.7 L |
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| Displacement | 10.8 L |
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| Cylinders | 6 |
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| Aspiration | Turbocharged, EGR and CAC |
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| Rated speed | 1800 rpm |
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| Gross power | 350 kW |
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Common problems
15- Over Current 1471
- Low Coolant Level 197
- Weak Battery 1442
- Under Frequency 1448
- Too Long in Idle 2342
- Speed/Hz Match 1469
- Speed Signal Lost 121
- Shutdown After Battle Short 1123
- Short Circuit 1445
- Remote Emergency Stop 1434
- Pre-Low Oil Pressure Sensor 143
- Pre-High Cool Temp 146
- Power Down Failure 1417
- Overspeed 234
- Over Frequency 1449
Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan QSM11G4.
Maintenance schedule
| Item | Spec | Capacity | Part # | Interval | |
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| Air filter | Clean/replace engine air cleaner element; Inspect/clean engine ground | | — | 1000 hr | |
| Fuel filter | Drain fuel system primary filter/water separator | | — | 500 hr | |
| Oil filter | Inspect, adjust or replace alternator or fan belt; Change cooling system coolant (ELC); Replace water separator element; Replace fuel system secondary filter; Inspect/adjust engine valve lash; Inspect aftercooler core; Inspect alternator; Inspect engine mounts; Inspect starting motor; Inspect turbocharger; Inspect water pump | | — | 2000 hr | |
| Battery | Check battery electrolyte level | | — | 500 hr | |
| Belt | Inspect, adjust or replace alternator or fan belt; Inspect/adjust engine valve lash; Inspect aftercooler core; Inspect alternator; Inspect engine mounts; Inspect starting motor; Inspect turbocharger; Inspect water pump | | — | 2000 hr | |
| Coolant | Check cooling system coolant level; Check driven equipment; Inspect engine air cleaner service indicator; Check engine oil level; Drain tank water and sediment; Check battery electrolyte level; Clean/test aftercooler core; Add cooling system coolant extender (ELC); Change cooling system coolant (ELC) | | — | 50 hr | |
| Coolant filter | | | — | | |
| Oil | Change engine oil and filter | | — | 12000 hr | |
| Spark plug | Inspect, adjust or replace alternator or fan belt; Inspect/adjust engine valve lash; Inspect aftercooler core; Inspect alternator; Inspect engine mounts; Inspect starting motor; Inspect turbocharger; Inspect water pump | | — | 2000 hr | |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
Service intervals
1| Item | Action | Hours | Months | Notes |
|---|
| Engine oil filter | Replace | 440 hr | | Last changed 8-12-24 at 440.8 Hrs |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Service specifications
6| Type | Item | Value | Unit | Condition |
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| Pressure | Oil pressure | 37 / 35 / 34 / 34 / 34 / 35 | | during load bank test at 300 kW (unit not stated in document) |
| Speed | Frequency | 60 | Hz | during load bank test |
| Temperature | Ambient temperature | 70 to 72 | °F | test room ambient |
| Temperature | Coolant freeze protection | -35 | °F | coolant level check |
| Temperature | Coolant temperature | 180 | °F | during load bank test (178°F during cool down) |
| Voltage | DC voltage | 28 | V | during load bank test |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Procedures
1Generator Check list maintenance
- Check coolant level and record freeze protection: -35F.
- Visually inspect radiator: Good.
- Visually inspect radiator hoses: Good.
- Check condition of coolant hoses: Good.
- Check condition of fuel hoses: Good.
- Check condition of engine belts: Good.
- Batteries and QTY: None.
- Battery install date if applicable: 8/17.
- Genset has battery charger: Yes.
- Genset has coolant heater: E204747, 240/480V, 4990W 1PH.
- Check engine oil level.
- Engine oil filters last changed date and HRS: 8-12-24, 440.8 Hrs.
- Inspect exhaust system for cracks / leaks: OPEN SKID UNIT.
- Check rain cap for proper operation: OPEN SKID UNIT.
- Generator end is 12 lead reconnectable; has PMG permanent magnet generator; electronic engine.
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Parts cataloged across the Cummins/Onan QSM11G4 family
12| Part # | Description | Category |
|---|
| ES100027 | Distribution Panel Wiring for T360 Series Single Phase Control | distribution_panel_wiring |
| ES100030 | Standard Generator Wiring for T360 Series | generator_wiring |
| A035N852 | Hose, Drain - Bulk (Order by the Foot - 1 Feet Required) | hose |
| ES100039 | Idle-Run Wiring (Cummins) | idle_run_wiring |
| 134890 | T360 Super Quiet Generator | other_service |
| 961-0514 | InPower Service Tool Kit | other_service |
| 961-0619 | Generator Set Support | other_service |
| A045Z906 | Isolator, Vibration | other_service |
| A045Z908 | Bracket, Switch | other_service |
| E204747 | Coolant heater 240/480V 6420W 1PH | other_service |
| ES100006 | Overcurrent Relay Wiring | overcurrent_relay_wiring |
| ES100026 | Three Position Stack Switch Wiring | stack_switch_wiring |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
Common questions
What is the oil capacity of the Cummins/Onan QSM11G4?
The Cummins/Onan QSM11G4 engine has an oil capacity of 36.72 liters.
What is the displacement of the Cummins/Onan QSM11G4?
The Cummins/Onan QSM11G4 has a displacement of 10.8 liters with 6 cylinders.
Which generators use the Cummins/Onan QSM11G4 engine?
The Cummins/Onan QSM11G4 powers 5 generator set(s), including Cummins/Onan DQHAA, Cummins/Onan DQHAB, Cummins/Onan DQHAB-6515690, Cummins/Onan DQHAB-7229336, Terex T360 Super Quiet Generator.
How often should you change the oil in the Cummins/Onan QSM11G4?
The Cummins/Onan QSM11G4 oil change interval is every 12000 hours.
What is a common problem with the Cummins/Onan QSM11G4 engine?
A commonly reported issue on generators using the Cummins/Onan QSM11G4 is: Over Current.