Mercedes-Benz OM457 engine
| Mercedes-Benz OM 457 | |
|---|---|
 | |
| Overview | |
| Manufacturer | Mercedes-Benz |
| Production | since 2003 |
| Layout | |
| Configuration | Inline 6 |
| Displacement | 11967 cm³ |
| Cylinder bore | 128 |
| Piston stroke | 155 |
| Cylinder block material | cast iron |
| Cylinder head material | cast iron |
| Valvetrain | OHV |
| Compression ratio | 18,5:1 |
| Combustion | |
| Turbocharger | 1 × BorgWarner, no VTG |
| Fuel system | Unit injecotrs |
| Fuel type | Diesel fuel 51 CZ, DIN EN 590 or EN 14214[1] |
| Cooling system | water-cooled |
| Output | |
| Power output | 185 – 335 kW |
| Torque output | 1,1 – 2,1 kNm |
| Dimensions | |
| Length | 1316 mm[1] |
| Width | 746 mm[1] |
| Height | 1019 mm[1] |
| Dry weight | 1045 kg[1] |
| Chronology | |
| Successor | OM 470 series |
The Mercedes Benz OM457 Engine is a 11967 cm³ displacement inline 6-cylinder 4-stroke Diesel engine. It is one of many motors in the 400 series of engines. The OM457 has many applications, including Truck, marine, military, municipal, and agricultural vehicles, as well as stationary settings. The engine has differing trim and power levels.
The engine is water-cooled, and is produced using cast-iron cylinder block, with cast-in cylinders. The engine utilizes diesel fuel delivered in a direct injection method from a Bosch PES style inline injection pump. The cylinder head is a single unit for all cylinders, and the cylinder head cover and air intake are shared by a single cast aluminum alloy. Exhaust ports 2&3 and 4&5 are siamesed together, presenting an exhaust manifold with only four outlets.
The crankshaft is a precision forged unit running in seven three-layer bearings, with counterweights bolted onto the crank webs, much like any other diesel motor of its vintage. The middle bearing is also the thrust bearing. The connecting rods are of a split design, with bronze bushings for the piston pin.
| Data | value[1] |
|---|---|
| Mercedes Benz Type | OM |
| Model | 457.951 LA |
| Combustion System | Four-stroke diesel with direct injection |
| Number of cylinders, Cylinder arrangement | 6, vertical in-line |
| Bore × Stroke, Displacement | 128 × 155 mm, 11967 cm³ |
| Compression ratio | 18,5:1 |
| Rated power | 260 kW at 2000 min−1 |
| Maximum torque | 1,6 kNm at 1100 min−1 |
| Idle Speed | 560 min−1 |
| Cylinder Firing Order | 1 - 5 - 3 - 6 - 2 - 4 |
| Maximum pressure of injection nozzles | 1800 bar |
| Max. operating temperature | 100 °C |
| Oil pressure | nominal 2 – 5 bar (200–500 kPa), idle min 0,5 bar |
| Weight, dry | 1045 kg |
References
Bibliography
- Daimler Chrysler: Powersystems • Industrial Engines Maintenance and Repair Series 457, 500 and 900 Advanced Training. May 2003