Mercedes-Benz OM629

The OM 628 and its successor, the OM 629 were turbo - diesel engine with eight cylinders in V configuration and common- rail direct fuel injection, developed and by the end of 2010 produced by Daimler -Benz for use in Mercedes -Benz cars from the upper middle class.

The abbreviation " OM " stands for " motor oil " (engine, which is operated with light oil / diesel) and has been known since the beginning of production to date, the diesel engines from Daimler.

History

The first V8 passenger car diesel engine from Daimler came in the summer of 2000 in the Mercedes S 400 CDI model of the S-Class ( 220 series ) on the market. In the aftermath of this type of engine found as E 400 CDI also use in the E-Class ( W 211 ) and came into the SUV G-Class and M-Class (W 163 ) are used. Depending on the model, he made 184-191 kW ( 250-260 hp).

With the engine OM 628 Daimler- Chrysler could with the previously published offers on eight-cylinder engines from the competitors Audi (A8 ) and BMW ( 740d ) to catch up.

As the successor came in mid-2005, the OM 629 with higher performance on the market. The end of 2010, the series was discontinued; the engine concept was not pursued by Daimler.

OM 628

The OM 628 was in summer 2000 in the Mercedes S 400 CDI model of the S-Class ( 220 series ) on the market.

The engine has an engine block made ​​of aluminum sand casting in bedplate design ( at the level of the crankshaft shared ) with inserted wet cylinder liners made ​​of cast iron (centrifugal casting ). In the lower part of the main bearing reinforcements are molded from GGG. The bore is 86 mm, the stroke of 86 mm. The compression ratio amounts to 18.5: 1, the cylinder spacing is 97 mm. For the angle between the cylinder banks were chosen from space reasons, 75 ° and not 90 ° as otherwise with V8 engines usual. This might result in free inertial forces of the first order. To compensate for this, a balancer shaft is disposed above the crankshaft in the cylinder V. For even firing intervals, the journal on the crankshaft are divided (without cheek). The cylinder number of the engine has a turbocharger with variable turbine vanes, two overhead camshafts and four valves per cylinder, actuated by hydraulic tappets. The charge air is cooled by an air -water heat exchanger with a second cold water circuit. This has the advantage that the cooler contains a smaller volume of air, at still lower flow resistance.

The OM 628 with the exact engine code OM 628 DE 40 LA took until 2005 in the following Mercedes vehicles using:

OM 629

With newer CDI technology and higher boost pressure of the turbocharger two, but the same displacement, this engine achieves higher power and torque values ​​. He, too, was used from mid-2005 in E-and S -Class sedan and also in M- and GL-Class 420 CDI under the name. In the G-Class, the OM 629 was accounted for in favor of the V6 CDI OM 642

The OM 629 with the exact engine code OM 629 DE 40 LA took until the end of 2010 in the following Mercedes vehicles using:

Other applications

The OM 629 comes under the name Thielert Centurion 4.0 also as an aircraft engine used.