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The Mercedes Benz OM457 Engine is a 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 trucks, marine, military, municipal, bus 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 (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 VGT
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; 248–449 hp)
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; 349 hp) 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

Bibliography

• Daimler Chrysler: Powersystems • Industrial Engines Maintenance and Repair Series 457, 500 and 900 Advanced Training. May 2003

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