Mercedes-Benz OM457 engine
The Mercedes Benz OM457 Engine is an 12.0 L (11,967 cc) 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.
| Mercedes-Benz OM 457 | |
|---|---|
 | |
| Overview | |
| Manufacturer | Mercedes-Benz |
| Production | since 2003 |
| Layout | |
| Configuration | Inline-6 |
| Displacement | 12.0 L; 730.3 cu in (11,967 cc) |
| Cylinder bore | 128 mm (5.0 in) |
| Piston stroke | 155 mm (6.1 in) |
| Block material | cast iron |
| Head material | cast iron |
| Valvetrain | OHV |
| Compression ratio | 18.5:1 |
| RPM range | |
| Idle | 560 |
| Combustion | |
| Turbocharger | 1 × BorgWarner, no VTG |
| Fuel system | Unit injectors |
| Fuel type | Diesel fuel 51 CZ, DIN EN 590 or EN 14214[1] |
| Cooling system | Water-cooled |
| Output | |
| Power output | 185–335 kW (252–455 PS) |
| Torque output | 1.1–2.1 kN⋅m (811–1,549 lb⋅ft) |
| Dimensions | |
| Length | 1,316 mm (51.8 in)[1] |
| Width | 746 mm (29.4 in)[1] |
| Height | 1,019 mm (40.1 in)[1] |
| Dry weight | 1,045 kg (2,304 lb)[1] |
| Emissions | |
| Emissions target standard | Euro V or IMO IV |
| Emissions control technology | Diesel exhaust fluid |
| Chronology | |
| Predecessor | OM447 |
| Successor | OM460 |
The engine is water-cooled, and is produced using cast-iron cylinder block, with removable wet type cylinder liners. The engine utilizes diesel fuel delivered in a direct injection method from individual electronically controlled and camshaft actuated unit pumps. The cylinder heads are separate units for each cylinder.
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 and arrangement | vertical inline-6 |
| Bore × Stroke, Displacement | 128 mm × 155 mm (5.0 in × 6.1 in), 12.0 L (11,967 cc) |
| Compression ratio | 18.5:1 |
| Rated power | 260 kW (354 PS) at 2000 rpm |
| Maximum torque | 1.6 kN⋅m (1,180 lb⋅ft) at 1100 rpm |
| Cylinder Firing order | 1 - 5 - 3 - 6 - 2 - 4 |
| Maximum pressure of injection nozzles | 1,800 bar (26,000 psi) |
| Max. operating temperature | 100 °C (212 °F) |
| Oil pressure | nominal 2–5 bar (29–73 psi), idle min 0.5 bar (7.3 psi) |
| Weight, dry | 1,045 kg (2,304 lb) |
References
- Mercedes-Benz: Technical Data: OM 457 LA 260 kW, 1600 Nm, D457.951, On Highway EURO 4, Bus, Stadtbus. 21. December 2009
Bibliography
- Daimler Chrysler: Powersystems • Industrial Engines Maintenance and Repair Series 457, 500 and 900 Advanced Training. May 2003