Engines

Mercedes-Benz OM611, OM612 and OM613 engines (1997-06)


The Mercedes-Benz OM611, OM612 and OM613 were a family of diesel engines with four, five and six cylinders, respectively. The OM611, OM612 and OM613 turbo-diesel engines had cast iron blocks, alloy cylinder heads, common-rail injection, double overhead camshafts (duplex chain-driven), four valves per cylinder (actuated by tappets) and exhaust gas recirculation.

Released in 1997, the OM611 engine was the first Mercedes-Benz application of Bosch common-rail direct injection (operating at up to 1350 bar). The system included pilot injection whereby a small amount of fuel was injected into the cylinder and burned prior to combustion to pre-heat the combustion chamber to better maintain temperature and pressure through the combustion cycle.

The OM611 engine was initially fitted with turbocharger where boost pressure was controlled by a wastegate valve. From 1999, the OM611, OM612 and OM613 engines were fitted with a variable nozzle turbine (VNT, also known as a variable geometry turbocharger or VGT). The VNT used a set of vanes which were arranged in the path of the air flow and, by changing the angle of the vanes, the area of the turbine inlet would change. At low engine speeds, when air flow through the engine was relatively low, the velocity of the air flow could be increased by partially closing the vanes, thereby increasing turbine speed.

The OM611, OM612 and OM613 engines were replaced by the OM646, OM647 and OM648 engines.
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Engine Code Capacity Peak power Peak torque Model Years
OM611 DE 22 LA 611.960 2148 cc
(88.0 x 88.3)
92 kW at 4200 rpm 300 Nm at 1800-2600 rpm W202 C 220 CDI 1999-01
OM611 DE 22 LA red. 611.960 red. 2151 cc
(88.0 x 88.4)
75 kW at 4200 rpm 235 Nm at 1500-2600 rpm W202 C 200 CDI 1998-99
OM611 DE 22 LA 611.960 2151 cc
(88.0 x 88.4)
92 kW at 4200 rpm 300 Nm at 1800-2600 rpm W202 C 220 CDI 1997-99
OM611 DE 22 LA red. 611.961 red. 2151 cc
(88.0 x 88.4)
75 kW at 4200 rpm 235 Nm at 1500-2600 rpm W210 E 200 CDI 1998-99
OM611 DE 22 LA 611.961 2151 cc
(88.0 x 88.4)
92 kW at 4200 rpm 300 Nm at 1800-2600 rpm W210 E 220 CDI 1997-99
OM611 DE 22 LA red. 611.962 red. 2148 cc
(88.0 x 88.3)
85 kW at 4200 rpm 250 Nm at 1400-2600 rpm W203 C 200 CDI 2000-03
(VNT)
OM611 DE 22 LA 611.962 2148 cc
(88.0 x 88.3)
105 kW at 4200 rpm 315 Nm at 1800-2600 rpm W203 C 220 CDI 2000-03
(VNT)
OM611 DE 22 LA red. 611.961 red. 2148 cc
(88.0 x 88.3)
85 kW at 4200 rpm 250 Nm at 1400-2600 rpm W210 E 200 CDI 1999-03
(VNT)
OM611 DE 22 LA 611.961 2148 cc
(88.0 x 88.3)
105 kW at 4200 rpm 315 Nm at 1800-2600 rpm W210 E 220 CDI 1999-03
(VNT)
OM612 DE 27 LA 612.963 2685 cc
(88.0 x 88.3)
120 kW at 4200 rpm 370 Nm at 1600-2800 rpm (man.) W163 ML 270 CDI 1999-05
(VNT)
400 Nm at 1800-2600 rpm (auto)
OM612 DE 27 LA 612.962 2685 cc
(88.0 x 88.3)
125 kW at 4200 rpm 370 Nm at 1600-2800 rpm (man.) W203 C 270 CDI 2000-03
(VNT)
400 Nm at 1800-2600 rpm (auto)
400 Nm at 1800-2600 rpm (auto) W203 C 270 CDI 2003-05
(VNT)
OM612 DE 27 LA 612.967 2685 cc
(88.0 x 88.3)
125 kW at 4200 rpm 400 Nm at 1800-2600 rpm (man.) C209 CLK 270 CDI 2002-05
(VNT)
OM612 DE 27 LA 612.961 2685 cc
(88.0 x 88.3)
125 kW at 4200 rpm 370 Nm at 1600-2800 rpm (man.) W210 E 270 CDI 1999-03
(VNT)
400 Nm at 1800-2800 rpm (auto)
OM612 DE 30 LA 612.990 2950 cc
(88.0 x 97.0)
170 kW at 3800 rpm 540 Nm at 2000 rpm W203 C 30 CDI AMG 2002-04
(VNT)
OM613 DE 32 LA 613.961 3222 cc
(88.0 x 88.3)
145 kW at 4200 rpm 470 Nm at 1800 rpm W210 E 320 CDI 1999-03
(VNT)
OM613 DE 32 LA 613.960 3222 cc
(88.0 x 88.3)
145 kW at 4200 rpm 470 Nm at 1800 rpm W220 S 320 CDI 1999-03
(VNT)

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