The engine that powers Mercedes buses like the O405 and O408 is the Mercedes OM447. This series’ sturdy motor operates smoothly in any situation. If the OM447 is maintained correctly and on time, it can last up to 2,000,000 kilometers.
Since December 1984, Mercedes OM 447 engines have been manufactured. Power up to 204 horsepower (150 kW) was developed by the first modification. An outstanding value for the specific power is obtained because the motor only requires 6 cylinders, each of which has a volume of 12 liters.
The OM447 engine with 280 horsepower (206 kW) was introduced a year later. Compared to its predecessor, it was more efficient and produced more torque at low revs. The third Mercedes OM 447 engine modification, which produced 299 horsepower (220 kW), finally debuted in 1991. This is the same 12-liter diesel engine, but it is more potent thanks to a few new technologies.
Specifications
| Power output | 150 kW / 204 hp |
| Displacement | 11967 cc |
| Number of cylinders | 6 |
| Valves | 12 |
| Manufacturer | Mercedes |
| Compression ratio | 16.25:1 |
| Cylinder bore, mm | 128 |
| Piston stroke, mm | 155 |
| Main bearings | 7 pieces |
| Combustion chamber working volume | 122.74 cc |
| Power Index | 21 hp per liter (1000 cc) displacement |
Engine Modifications
- OM447.905 204 HP
- OM447.906 241 hp
- OM447.907 241 hp
- OM447.908 241 hp
- OM447.910 241 hp
- OM447.911 204 hp
- OM447.913 204 hp
- OM447.914 204 hp
- OM447.950 280 HP
- OM447.951 280 HP
- OM447.955 241 hp
- OM447.956 241 hp
- OM447.957 241 hp
- OM447.959 241 hp
- OM447.970 204 hp
- OM447.971 241 hp
- OM447.973 204 hp
- OM447.976 241 hp
- OM447.978 241 hp
- OM447.974 241 hp
- OM447.996 241 hp