Engine Mercedes OM611
Content
Mercedes-Benz OM611, OM612 and OM613 were a family of diesel engines with four, five and six cylinders, respectively.
General information about the OM611 engine
The OM611 turbo diesel engine has a cast iron block, cast cylinder head, common rail injection, double overhead camshafts (two-stroke chain drive), four valves per cylinder (driven by pushers) and an exhaust gas recirculation system.
The OM1997 engine released in 611 by Mercedes-Benz was the first to use the Bosch Common-Rail direct fuel injection system (operating at pressures up to 1350 bar). The OM611 engine was originally equipped with a turbocharger in which the boost pressure was controlled by a wastegate.
Since 1999, the OM611 engine has been equipped with a variable nozzle turbine (VNT, also known as a variable geometry turbocharger or VGT). VNT used a set of blades that were located in the path of the air flow, and by changing the angle of the blades, the volume of air passing through the turbine, as well as the flow rate, changed.
At low engine speeds, when the air flow into the engine was relatively low, the air flow rate could be increased by partially closing the blades, thereby increasing the speed of the turbine.
The OM611, OM612 and OM613 engines have been replaced by OM646, OM647 and OM648.
Specifications and Modifications
| Engine | Code | Volume | Power | Twisting | Installed | Years of issue |
|---|---|---|---|---|---|---|
| OM611 FROM 22 LA | 611.960 | 2148 (88.0 x 88.3) | 125 h.p. at 4200 rpm | 300 Nm 1800-2600 rpm | W202C 220CDI | 1999-01 |
| OM611 OF 22 THE network. | 611.960 network. | 2151 (88.0 x 88.4) | 102 h.p. at 4200 rpm | 235 Nm 1500-2600 rpm | W202C 200CDI | 1998-99 |
| OM611 FROM 22 LA | 611.960 | 2151 (88.0 x 88.4) | 125 h.p. at 4200 rpm | 300 Nm 1800-2600 rpm | W202C 220CDI | 1997-99 |
| OM611 OF 22 THE network. | 611.961 network. | 2151 (88.0 x 88.4) | 102 h.p. at 4200 rpm | 235 Nm 1500-2600 rpm | W210 AND 200 CDI | 1998-99 |
| OM611 FROM 22 LA | 611.961 | 2151 (88.0 x 88.4) | 125 h.p. at 4200 rpm | 300 Nm 1800-2600 rpm | W210 AND 220 CDI | 1997-99 |
| OM611 OF 22 THE network. | 611.962 network. | 2148 (88.0 x 88.3) | 115 h.p. at 4200 rpm | 250 Nm 1400-2600 rpm | W203C 200CDI | 2000-03 (VNT) |
| OM611 FROM 22 LA | 611.962 | 2148 (88.0 x 88.3) | 143 h.p. at 4200 rpm | 315 Nm 1800-2600 rpm | W203C 220CDI | 2000-03 (VNT) |
| OM611 OF 22 THE network. | 611.961 network. | 2148 (88.0 x 88.3) | 115 h.p. at 4200 rpm | 250 Nm 1400-2600 rpm | W210 AND 200 CDI | |
| OM611 FROM 22 LA | 611.961 | 2148 (88.0 x 88.3) | 143 h.p. at 4200 rpm | 315 Nm 1800-2600 rpm | W210 AND 220 CDI | 1999-03 (VNT) |
OM611 problems
Intake manifold... As with many engines installed in Mercedes, there is the problem of weak flaps in the intake manifold, since they are made of plastic. Over time, they can crack and partially get into the engine, but this does not lead to serious damage. Also, when these dampers begin to wedge, the holes of the axis along which the dampers rotate can begin to break.
Nozzles... Also, breakdowns associated with wear of the injectors are not uncommon, because of which they begin to leak. The reason may be metallic abrasive and poor quality fuel. At least 60 thousand km. it is advisable to replace the refractory washers under the injectors and the mounting bolts, in order to avoid the penetration of dirt into the engine.
Spread on the Sprinter... Most often, the problem of cranking the camshaft bearings is manifested precisely on Sprinter models. The 2nd and 4th liners are subject to rotation. The reason for this malfunction lies in the insufficient performance of the oil pump. The problem is solved by installing a more powerful oil pump from more modern versions ОМ612 and ОМ613.
Where is the number
Tuning OM611
The most common tuning option for OM611 is chip tuning. What results can be achieved by simply changing the firmware for the OM611 2.2 143 hp engine:
- 143 h.p. -> 175-177 HP;
- 315 Nm -> 380 Nm of torque.
The changes are not catastrophic and this will not significantly affect the engine resource (in any case, you will not notice a decrease in the resource on the runs that these motors can withstand).
Video about the engine Mercedes OM611
