Engineering:Mercedes-Benz OM668 engine

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Mercedes-Benz OM668 engine
Overview
ManufacturerDaimler AG
Production1997-
Layout
ConfigurationInline-four engine
Displacement1.7 L (1,689 cc)
Cylinder bore80 mm (3.1 in)
Piston stroke84 mm (3.3 in)
ValvetrainDOHC 4 valves x cyl.
Combustion
TurbochargerSingle turbo with intercooler
Fuel systemCommon Rail
Fuel typeDiesel
Cooling systemWater cooled
Output
Power output44–70 kW (59–94 hp)
Torque output160–180 N⋅m (118–133 lb⋅ft)
Chronology
SuccessorMercedes-Benz OM640

The Mercedes-Benz OM668 engine is a 1.7-litre (1,689 cc) diesel inline-four engine manufactured by the Mercedes-Benz division of Daimler AG. It was used in the Mercedes-Benz W168 from 1997 to 2004 and the Mercedes-Benz W414 from 2001 to 2005.

Description

The OM 668 makes use of the common rail 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 44 kW (59 hp) power also have an intercooler. In 1997 the OM 668 was the smallest diesel engine by Mercedes-Benz.

There are no mechanical differences between the engines, except from the 44 kW (59 hp) 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 88 kW (118 hp) 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 200 N⋅m (148 lbf⋅ft), the clutch of the W 168 may wear out faster, if the rated power is increased. The OM668 later developed into the Thielert Centurion 1.7 aero engine

Models

Engine* Name Power Torque Model
OM 668 DE 17 A 668.941 44 kW (59 hp) at 3600 min−1 160 N⋅m (118 lbf⋅ft) at 1500–2400 min−1 A 160 CDI (1997 - 2001)
OM 668 DE 17 LA red. 668.940 red. 55 kW (74 hp) at 3600 min−1 160 N⋅m (118 lbf⋅ft) at 1500–2800 min−1 A 160 CDI (2001 - 2004) and Vaneo CDI
OM 668 DE 17 LA 668.940 66 kW (89 hp) at 4200 min−1 180 N⋅m (133 lbf⋅ft) at 1600–3200 min−1 A 170 CDI (1997 - 2001) and Vaneo 1.7 CDI
OM 668 DE 17 LA 668.942 70 kW (94 hp) at 4200 min−1 180 N⋅m (133 lbf⋅ft) 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 and for the engine of concept car Rinspeed Presto.

See also

Sources