Mercedes-Benz OM 656
| Mercedes Benz | |
|---|---|
| OM 656 | |
| Manufacturer: | Daimler AG |
| Production period: | since 2017 |
| Working principle: | diesel |
| Design: | In-line engine , six-cylinder |
| Displacement: | 2925 cc |
| Previous model: | OM 642 |
| Successor: | none |
| Similar models: | OM 654 |
The OM 656 is a diesel engine from Mercedes-Benz that was introduced in 2017. The assembly takes place at MDC Power GmbH in Kölleda.
The six-cylinder in - line engine OM 656 is the successor to the OM 642 and part of a modular engine generation that includes four and six-cylinder diesel engines as well as four and six-cylinder petrol engines . With the same cylinder displacement (approx. 487 cm³) and spacing (90 mm), a large number of identical parts is achieved.
The engine was first used in 2017 in the facelift of the S-Class ( 222 series ).
technology
Base engine
The displacement of the six-cylinder in - line engine is 2925 cm³ with a bore of 82 mm and a stroke of 92.4 mm, with a cylinder spacing of 90 mm. The compression ratio is 15.5. The engine's crankcase is made of aluminum, the cylinder head is made of a high-strength aluminum alloy. Steel pistons and a so-called NANOSLIDE® cylinder coating are used. This is an iron-carbon layer that is applied directly to the aluminum surface using arc wire spraying and enables high oil retention volumes in the cylinder liner.
The gas exchange is controlled via four valves per cylinder ( four-valve technology ) and two overhead camshafts driven by a timing chain . The engine has a switchable exhaust camshaft to help heat the exhaust system.
Charging and exhaust
The engine has a two-stage exhaust gas turbocharger from BorgWarner. The compressed fresh air is cooled in a charge air cooler .
The OM 656 has both a cooled low pressure exhaust gas recirculation (EGR) and a cooled high pressure exhaust gas recirculation. The exhaust gas from the low-pressure EGR is taken from behind the particle filter, cooled and fed back in before the compressor.
The exhaust gas aftertreatment system of the OM 656 is identical to that of the OM 654 , is carried out close to the engine and was designed for test procedures such as the WLTP cycle and Real Driving Emissions (RDE) . A diesel oxidation catalytic converter (DOC) is used behind the turbine of the turbocharger , then the AdBlue urea solution required to clean the nitrogen oxides is metered in using a downflow mixer. A short mixing section is followed by an SCR-coated diesel particulate filter (sDPF) and an SCR catalytic converter .
Injection and combustion process
The common rail injection works with a fuel pressure of up to 2500 bar.
As with the OM 654 , the stepped bowl combustion process is used. Compared to the previous Omega trough, this should lead to a better degree of efficiency with lower raw particle emissions at the same time.
Versions
The OM 656 is offered in several performance levels.
OM 656 D 29 R SCR *
| Sales description | model series | Construction period |
|---|---|---|
| Displacement: 2925 cm³, power: 200 kW (272 hp) at 3400-4600 / min, torque: 600 Nm at 1200-3200 / min | ||
| GLE 350 d 4MATIC | Series 167 | since 12/2018 |
| Displacement: 2925 cm³, output: 210 kW (286 hp) at 3400-4600 / min, torque: 600 Nm at 1200-3200 / min | ||
| CLS 350 d 4MATIC | Series 257 | since 03/2018 |
| E 350 d | Series 213 | since 09/2018 |
| Series 238 | since 11/2018 | |
| G 350 d 4MATIC | 463 series | since 01/2019 |
| GLC 350 d 4MATIC | Series 253 | since 09/2019 |
| GLS 350 d 4MATIC | Series 167 | since 10/2019 |
| S 350 d (4MATIC) | 222 series | since 07/2017 |
OM 656 D 29 SCR *
| Sales description | model series | Construction period |
|---|---|---|
| Displacement: 2925 cm³, output: 243 kW (330 hp) at 3600-4000 / min, torque: 700 Nm at 1200-3000 / min | ||
| GLC 400 d 4MATIC | Series 253 | since 07/2019 |
| GLE 400 d 4MATIC | Series 167 | since 12/2018 |
| GLS 400 d 4MATIC | Series 167 | since 10/2019 |
| Displacement: 2925 cm³, output: 250 kW (340 hp) at 3600-4400 / min, torque: 700 Nm at 1200-3200 / min | ||
| CLS 400 d 4MATIC | Series 257 | since 03/2018 |
| E 400 d 4MATIC |
Class 213 Class 238 |
since 04/2018 since 09/2018 |
| S 400 d (4MATIC) | 222 series | since 07/2017 |
* The engine designation is encoded as follows: OM = oil engine (diesel), series = three-digit, D = direct injection, displacement = deciliters (rounded), R = reduced power, SCR = type of exhaust gas aftertreatment
Individual evidence
- ↑ Our products , MDC Power GmbH website, accessed on December 16, 2017.
- ↑ This is the new 2016 model , accessed on February 15, 2015
- ↑ a b c d From 2017 new generation of 4- and 6-cylinder in-line engines for petrol and diesel. MB Passion Blog, October 28, 2016, accessed October 29, 2016 .
- ↑ View of the new OM 656 inline 6-cylinder diesel - Mercedes-Benz Passion Blog / Mercedes Benz, smart, Maybach, AMG . In: Mercedes-Benz Passion Blog / Mercedes Benz, smart, Maybach, AMG . August 15, 2017 ( mercedes-benz-passion.com [accessed August 15, 2017]).