Mercedes-Benz OM457 engine
The Mercedes Benz OM457 Engine is a 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. 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.