The Generac 12 DTA is a 11.95 L 6-cylinder turbocharged/aftercooled (air to air) engine rated at 2280 rpm, producing up to 414 kW. It powers generator sets from Generac, including the MB300, MB375 and MD375. It holds 31 L (8.2 gal) of oil and 83.28 L (22.0 gal) of coolant.
Also known as: GENERAC 12 DTA
Part of the Generac 12.0DT engine family — 2 variants share parts & fitment.
| Oil capacity | 31.0 L |
|---|---|
| Coolant capacity | 83.28 L |
| Displacement | 11.95 L |
| Cylinders | 6 |
| Aspiration | Turbocharged/Aftercooled (Air to Air) |
| Rated speed | 2280 rpm |
| Gross power | 414 kW |
| Symptom | Cause | Remedy |
|---|---|---|
| Engine is running, but no AC output is available. | Circuit breaker is open. | Reset circuit breaker. |
| Engine is running, but no AC output is available. | Poor connection or defective cord set. | Check and repair. |
| Engine is running, but no AC output is available. | Connected device is bad. | Connect another device that is in good condition. |
| Engine is running, but no AC output is available. | Fault in generator. | Contact Authorized Service Facility. |
| Engine runs good but bogs down when loads are connected. | Short circuit in a connected load. | Disconnect shorted electrical load. |
| Engine runs good but bogs down when loads are connected. | Generator is overloaded. | See “Don’t Overload the Generator” on page 9. |
| Engine runs good but bogs down when loads are connected. | Engine speed is too slow. | Contact Authorized Service Facility. |
| Engine runs good but bogs down when loads are connected. | Shorted generator circuit. | Contact Authorized Service Facility. |
| Engine will not start; or starts and runs rough. | Dirty air cleaner. | Clean or replace air cleaner. |
| Engine will not start; or starts and runs rough. | Out of gasoline. | Fill fuel tank. |
| Engine will not start; or starts and runs rough. | Stale gasoline. | Drain fuel tank and fill with fresh fuel. |
| Engine will not start; or starts and runs rough. | Spark plug wire not connected to spark plug. | Connect wire to spark plug. |
| Engine will not start; or starts and runs rough. | Bad spark plug. | Replace spark plug. |
| Engine will not start; or starts and runs rough. | Water in gasoline. | Drain fuel tank; fill with fresh fuel. |
| Engine will not start; or starts and runs rough. | Overchoking. | Put choke knob to No Choke position. |
| Engine will not start; or starts and runs rough. | Low oil level. | Fill crankcase to proper level. |
| Engine will not start; or starts and runs rough. | Excessive rich fuel mixture. | Contact Authorized Service Facility. |
| Engine will not start; or starts and runs rough. | Intake valve stuck open or closed. | Contact Authorized Service Facility. |
| Engine will not start; or starts and runs rough. | Engine has lost compression. | Contact Authorized Service Facility. |
| Engine shuts down during operation. | Out of gasoline. | Fill fuel tank. |
| Engine shuts down during operation. | Low oil level. | Fill crankcase to proper level. |
| Engine shuts down during operation. | Fault in engine. | Contact Authorized Service Facility. |
| Engine lacks power. | Load is too high. | See “Don’t Overload the Generator” on page 9. |
| Engine lacks power. | Dirty air filter. | Replace air filter. |
| Engine lacks power. | Engine needs to be serviced. | Contact Authorized Service Facility. |
| Engine “hunts” or falters. | Choke is opened too soon. | Move choke to halfway position until engine runs smoothly. |
| Engine “hunts” or falters. | Carburetor is running too rich or too lean. | Contact Authorized Service Facility. |
| No Battery Charge DC output. | Battery posts are corroded. | Clean battery posts. |
| No Battery Charge DC output. | Battery cable is bad. | Replace cable. |
| No Battery Charge DC output. | Battery is defective. | Check battery condition; replace if defective. |
| No Battery Charge DC output. | Receptacle is bad. | Contact Authorized Service Facility. |
Fault codes and symptom→remedy steps extracted from this engine’s service/owner documentation; verify against the official manual before servicing.
Step-by-step procedures compiled from the Generac service manual for this engine.
The Generac 12 DTA engine has an oil capacity of 31.0 liters.
The Generac 12 DTA has a displacement of 11.95 liters with 6 cylinders.
The Generac 12 DTA powers 3 generator set(s), including Generac MB300, Generac MB375, Generac MD375.