The

Mercedes-Benz Mercedes-Benz (), commonly referred to simply as Mercedes and occasionally as Benz, is a German automotive brand that was founded in 1926. Mercedes-Benz AG (a subsidiary of the Mercedes-Benz Group, established in 2019) is based in Stuttgart, ...

OM457 Engine is a displacement inline 6-cylinder

4-stroke A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either directio ...

Diesel engine. It is one of many motors in the 400 series of engines, being an improved, electronically-managed version of the OM447. The OM457 has many applications, including trucks, marine, military, municipal, bus and agricultural vehicles, as well as stationary settings. The engine has many differing trim and power levels, ranging from around 250 to 450 horsepower, as well as both a vertically-mounted and, for buses, a horizontally-mounted version (denominated OM 457 hLA). The engine is water-cooled and is produced using a cast-iron cylinder block, with removable wet type

cylinder liner In an engine, the cylinder is the space in which a piston travels. The inner surface of the cylinder is formed from either a thin metallic liner (also called "sleeve") or a surface coating applied to the engine block. A piston is seated inside e ...

s. 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 A crankshaft is a mechanical component used in a reciprocating engine, piston engine to convert the reciprocating motion into rotational motion. The crankshaft is a rotating Shaft (mechanical engineering), shaft containing one or more crankpins, ...

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 rod A connecting rod, also called a 'con rod', is the part of a reciprocating engine, piston engine which connects the piston to the crankshaft. Together with the crank (mechanism), crank, the connecting rod converts the reciprocating motion of the p ...

s are of a split design, with bronze bushings for the piston pin.

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 {{DEFAULTSORT:Mercedes-Benz Om352 Engine OM352 Diesel engines by model Straight-six engines