Generac QT Engine Engine
The Generac QT is a 3 L natural aspiration engine rated at 1800 rpm. It powers generator sets from Generac, including the Q. It holds 3.5 L (0.9 gal) of oil and 3.5 L (0.9 gal) of coolant.
Also known as: Generac QT
Engine specifications
| Oil capacity | 3.5 L |
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| Coolant capacity | 3.5 L |
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| Displacement | 3.0 L |
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| Aspiration | Natural aspiration |
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| Rated speed | 1800 rpm |
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Generator sets powered by this engine
1Common problems
15- Bottom out 9202-1
- Q 7000 120/240 58/29 60 3600 | 2570 | Bottom out | Universal 92116 9677-3
- NP 6600 120/240 55/27 60 3600 | 2700 | Bottom out | Universal 92116 9600-0
- NP 5000 120/240 41/20 60 3600 | 2751 Bottom out | Universal 92116 9712-0
- Bottom out | Out-the-side 9205-1
- 7000 120/240 Bottom out Universal 9593-1
- 6600 9509-2
- No AC output from generator.
Cause: Defective AUTO/OFF/MANUAL switch
Fix: Replace switch.* - Engine won’t crank.
Cause: 1. 15 amp fuse blown. 2. Loose or corroded or defective battery cables. 3. Defective starter contactor. 4. Defective starter motor. 5. Dead or Defective Battery. 6. 5 amp fuse blown.
Fix: 1. Replace fuse. 2. Tighten, clean or replace battery cables as necessary. 3. Replace contactor. 4. Replace starter motor. 5. Remove, change or replace battery. 6. Replace fuse. - Engine starts then shuts down.
Cause: AUTO/OFF/MANUAL Switch at OFF, engine continues to run
Fix: 1. Replace switch.* - Engine starts hard, runs rough.
Cause: 1. Flame arrestor (air cleaner) plugged or damaged. 2. Plugged fuel line. 3. Defective spark plugs. 4. Fuel pressure incorrect. - Engine cranks but won't start
Cause: 1. Out of fuel. 2. Fuel solenoid (FS) is defective 3. Open Wire #14A from Engine Control circuit board.
Fix: 1. Replenish fuel. 2. Replace solenoid. 3. Reconnect wire. - Defective Low Oil Pressure Switch
Cause: 3. Engine oil level is low. 4. Engine is overheated.
Fix: 3. Replace switch. - Defective Coolant Temperature Switch
Cause: 4. Engine starts then shuts down.
Fix: 4. Replace switch. - Safety Warning Safety 001
Fix: Immediately shut down the source of electrical power; free the victim from live conductor using nonconducting implement; apply first aid and get immediate medical help
Compiled from service & troubleshooting documentation across every generator set that uses the Generac QT.
Maintenance schedule
| Item | Spec | Capacity | Part # | Interval | |
|---|
| Air filter | Air Filter | | — | 500 hr | find |
| Fuel filter | Fuel Filter | | — | 500 hr | find |
| Oil filter | Oil Filter | | — | 500 hr | find |
| Belt | Fan Belt | | — | 500 hr | find |
| Coolant | Coolant | 3.5 L | — | 800 hr | |
| Oil | Engine Oil | 4.0 L | — | 500 hr | |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
Common questions
What is the oil capacity of the Generac QT?
The Generac QT engine has an oil capacity of 3.5 liters.
What is the displacement of the Generac QT?
The Generac QT has a displacement of 3.0 liters.
Which generators use the Generac QT engine?
The Generac QT powers 1 generator set(s), including Generac Q.
How often should you change the oil in the Generac QT?
The Generac QT oil change interval is every 500 hours.
What is a common problem with the Generac QT engine?
A commonly reported issue on generators using the Generac QT is: Bottom out.