The Mercedes-Benz OM668 engine is a diesel

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 ...

manufactured by the

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 ...

division of

Daimler AG The Mercedes-Benz Group AG (previously named Daimler-Benz, DaimlerChrysler and Daimler) is a German multinational automotive corporation headquartered in Stuttgart, Baden-Württemberg, Germany. It is one of the world's leading car manufacture ...

. It was used in the

Mercedes-Benz W168 The Mercedes-Benz A-Class is a subcompact car produced by the German automobile manufacturer Mercedes-Benz as the brand's entry-level vehicle. The first generation (internally coded W168) was introduced in 1997, the second generation (W169) in ...

from 1997 to 2004 and the Mercedes-Benz W414 from 2001 to 2005.

Description

The OM 668 makes use of the

common rail Common rail direct fuel injection is a direct fuel injection system built around a high-pressure (over ) fuel rail feeding solenoid valves, as opposed to a low-pressure fuel pump feeding unit injectors (or pump nozzles). High-pressure injection ...

system. Compared to the otto engine M 166 it has 4 valves per cylinder instead of two. Two chain driven overhead camshafts are used. The intake camshaft is driven by a chain, the exhaust camshaft is connected to the intake camshaft with a gear. Another chain drives the oil pump from the crankshaft. All engines have a turbocharger and all engines with more than power also have an

intercooler An intercooler is a heat exchanger used to cool a gas after compression. Often found in turbocharged engines, intercoolers are also used in air compressors, air conditioners, refrigeration and gas turbines. Internal combustion engines Mo ...

. In 1997 the OM 668 was the smallest diesel engine by Mercedes-Benz. There are no mechanical differences between the engines, except from the engine, which does not have an intercooler. In 2001, the camshaft and turbocharger were modified slightly. This increased the rated power, but not the torque, due to the weak clutch of the Mercedes-Benz W 168. Without any physical changes to the engine, the power can be increased to only by changing the software of the ECU. This does not decrease the durability of the robust engine. Due to the increased torque of up to , the clutch of the W 168 may wear out faster, if the rated power is increased.

Models

{, class="wikitable" , style="background:#CCCCCC;text-align:left" , Engine* , style="background:#CCCCCC;text-align:left" , Name , style="background:#CCCCCC;text-align:left" , Power , style="background:#CCCCCC;text-align:left" , Torque , style="background:#CCCCCC;text-align:left" , Model , - , OM 668 DE 17 A , 668.941 , at 3600 min⁻¹ , at 1500–2400 min⁻¹ , A 160 CDI (1997 - 2001) , - , OM 668 DE 17 LA red. , 668.940 red. , at 3600 min⁻¹ , at 1500–2800 min⁻¹ , A 160 CDI (2001 - 2004) and Vaneo CDI , - , OM 668 DE 17 LA , 668.940 , at 4200 min⁻¹ , at 1600–3200 min⁻¹ , A 170 CDI (1997 - 2001) and Vaneo 1.7 CDI , - , OM 668 DE 17 LA , 668.942 , at 4200 min⁻¹ , {{convert, 180, Nm, 0, abbr=on at 1600–3600 min⁻¹ , A 170 CDI (2001 - 2004) , - *OM = Oelmotor (diesel engine),
668 = engine series,
DE = Direkteinspritzung (common rail injection),
17 = approximate Displacement in dl,
A = Abgasturbolader (turbocharger),
L = Ladeluftkühler (intercooler),
red. = reduced power

Other applications

The OM668 is the basis for the Thielert Centurion 1.7

aircraft engine An aircraft engine, often referred to as an aero engine, is the power component of an aircraft propulsion system. Most aircraft engines are either piston engines or gas turbines, although a few have been rocket powered and in recent years many ...

and for the engine of concept car

Rinspeed Presto The Rinspeed Presto is a concept car from the Swiss company Rinspeed, unveiled in 2002. At the touch of a button, it would expand it from a 2.7 metre, two-seat cabrio to a 3.6 metre, four-seater. It has a Pre-Peg Composite plastic body and runs on ...

Sources

*A-Klasse manual (MOPF 2001)
Technical dataW 168/OM 668 on Elchfans.de
OM668 Diesel engines by model Straight-four engines

Description

Models

Other applications

See also

Sources