The OM646 is a

turbocharged In an internal combustion engine, a turbocharger (often called a turbo) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake gas, forcing more air into the engine in order to pro ...

inline-four engine A straight-four engine (also called an inline-four) is a four-cylinder piston engine where cylinders are arranged in a line along a common crankshaft. The vast majority of automotive four-cylinder engines use a straight-four layout (with the ...

produced between 2002 and 2010 by

Mercedes-Benz Mercedes-Benz (), commonly referred to as Mercedes and sometimes as Benz, is a German luxury and commercial vehicle automotive brand established in 1926. Mercedes-Benz AG (a Mercedes-Benz Group subsidiary established in 2019) is headquartere ...

Design

The OM646 engine is sold under the 200 CDI and 220 CDI designation and features an electric

fuel pump A fuel pump is a component in motor vehicles that transfers liquid from the fuel tank to the carburetor or fuel injector of the internal combustion engine. Carbureted engines often use low pressure mechanical pumps that are mounted outside the f ...

exhaust gas recirculation In internal combustion engines, exhaust gas recirculation (EGR) is a nitrogen oxide () emissions reduction technique used in petrol/gasoline, diesel engines and some hydrogen engines. EGR works by recirculating a portion of an engine's exhaust ...

, particulate filters, and

Euro 4 The European emission standards are vehicle emission standards for pollution from the use of new land surface vehicles sold in the European Union and EEA member states and the UK, and ships in EU waters. The standards are defined in a ser ...

emission standard Emission standards are the legal requirements governing air pollutants released into the atmosphere. Emission standards set quantitative limits on the permissible amount of specific air pollutants that may be released from specific sources over ...

compliance (from 2003). In 2006, the engine was updated under the EVO name and replaced the OM647 and OM648 engines. It features a reduced compression ratio of 17.5:1, a new turbocharger, and ceramic

glow plugs A glowplug (alternatively spelled as glow plug or glow-plug) is a heating device used to aid in starting diesel engines. In cold weather, high-speed diesel engines can be difficult to start because the mass of the cylinder block and cylinder he ...

for improved engine starts.

Models

OM646 DE22 LA R

* 2003–2006 W211 E200 CDI * 2003–2007 W203 C200 CDI * 2003–2010 W639 Vito 109 CDI, 111 CDI, 2.0 CDI * 2008–2010 CL203 CLC200 CDI *2003-2009

Chrysler PT Cruiser The Chrysler PT Cruiser is a retro-styled compact car manufactured and marketed internationally by Chrysler in 5-door hatchback wagon (2001–2010) and 2-door convertible (2005–2008) body styles—over a single generation, with an intermedia ...

OM646 DE22 LA

* 2002–2006 W211 E220 CDI * 2004–2007 W203 C220 CDI * 2003–2010 W639 Vito 115 CDI, 2.2 CDI * 2005–2010 C209 CLK220 CDI * 2006–2009 W906 Sprinter 209-516 CDI * 2008–2010 CL203 CLC220 CDI * 2010–2013

Vito Vito is an Italian name that is derived from the Latin word "''vita''", meaning "life". It is a modern form of the Latin name Vitus, meaning "life-giver," as in San Vito or Saint Vitus, the patron saint of dogs and a heroic figure in southern ...

(Chinese market; known as OM646 980) * 2003–2009

OM646 DE 22 LA EVO R

* 2006–2009 W211 E200 CDI * 2007–2009 W204 C200 CDI

OM646 DE 22 LA EVO

* 2006–2009 W211 E220 CDI * 2007–2009 W204 C220 CDI

References

{{reflist, 30em OM646 Diesel engines by model Straight-four engines