Engine Mercedes OM605

Engine Mercedes OM605

The Mercedes OM605 engine is a 5-cylinder pre-chamber diesel engine equipped with an ERE control system (Electronische Reihen Einspritzpumpe) with a displacement of 2497 cm3. This 2.5-liter engine was assembled from 1993 to 2001 and was installed on several very popular models of the concern, such as W124, W202, W210. It was offered in an atmospheric version with 113 hp and a turbocharged version with 150 hp.

Prechamber OM 605 diesels are named after the method of mixing and preparation of the working mixture: as a result of the piston stroke, at the end of the compression stroke, air is forced through a thin opening of the preliminary combustion chamber (prechamber) while strongly swirling. Where actually the fuel is injected. Thus, fuel combustion does not take place in the cylinder, but in a specially designed chamber, which is located in the block head.


Displacement, cc 2497
Power, hp (kW) at rpm naturally aspirated engine: 113 (83) / 5000; turbocharged engines 150 (110) / 4400
Torque output, Nm at rpm naturally aspirated engine: 170 / 2800; turbocharged engines 280 / 1800
Fuel type diesel fuel
Fuel consumption, L/100 km naturally aspirated engine: 8.1; turbocharged engines 7.3-8.7
Configuration inline, five-cylinder, SOHC/OHC
Injection split combustion engine
Enriching the Mixture turbo / charge air cooler
Number of cylinders 5
Number of valves 20
Cylinder bore, mm 87
Piston stroke, mm 84
Supercharger Garrett
Rotational speed 4400 RPM
Torque output 280 Nm
Compression ratio 22:1

A feature of these diesel engines was increased noise during operation, since the entire portion of fuel is burned in one portion. Compared to gasoline, these diesel engines were distinguished by lower fuel consumption, but at the same time low power.
Engine Mercedes OM605 under the hood

Benefits of OM605

  • reliability – low-power cast iron motor, the piston group does not experience heavy loads and, as a result, easily withstands up to 1 million km with proper maintenance;
  • a minimum of electronics – the lack of a large number of electronics and computers contributes to harmonious work;
  • economical compared to gasoline engines.

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