Mercedes OM656 Diesel Engine Manuals
The Mercedes-Benz OM656 Engine is a 2.9 L (2,927.8 cc) Inline Straight 6-Cylinder Motor with Supercharger and Turbocharger features, that has been produced from 2016-on
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Download: OM656 Engine Introduction Into Service
Mercedes OM656 Engine Introduction Manual
Overview Manual: Describes engine components, operation, specs
Download: 18.5 mb, 17 pages, .pdf
Models: D29T R SCR, D29T SCR
USD
$9.95
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OM656 Engine Technical Data
The OM656 is a turbocharged diesel engine first introduced in the facelift W222 S-Class. It features all-aluminium engine block with steel pistons, dual overhead camshafts with variable valve timing, and uses AdBlue injection and exhaust gas recirculation to reduce emissions. The cylinder walls are coated with arc sprayed steel providing increased porosity which aids oil film strength to reduce friction. It superseded the OM642 engine.
OM656 output has increased significantly from the preceding model all while consuming up to six percent less fuel. Special traits of this diesel engine family include a stepped-bowl combustion process, two-stage turbocharging and, for the first time, the use of CAMTRONIC variable valve-lift control. along with improved NANOSLIDE® coating of the cylinder walls.
This new six-cylinder diesel engine is designed to comply with future emissions legislation (RDE – Real Driving Emissions). Components for efficient emissions reduction are installed directly on the engine.
Versions and Specifications
| Engine Versionn | Power @ RPM | Torque @ RPM | Years |
|---|---|---|---|
| D29T R SCR | 210 kW (282 hp) at 3,400–4,600 | 600 Nm (443 lb.ft) at 1,200-3,200 | 2017- |
| D29T SCR | 250 kW (335 hp) at 3,600-4,400 | 700 Nm (516 lb.ft) at 1,200-3,200 |
Configuration OM656 Straight six engine
- Displacement 2.9 L (2,927.8 cc)
- Cylinder bore 82 mm (3.23 in)
- Piston stroke 92.4 mm (3.64 in)
- Cylinder block material Aluminium alloy
- Cylinder head material Aluminium alloy
- Valvetrain DOHC 4 valves x cyl. with VVT
- Compression ratio 15.5:1
Combustion
- Supercharger BorgWarner's eBooster® electrically driven compressor
- Turbocharger Single-turbo
- Fuel system Common rail Direct injection
- Fuel type Diesel
- Cooling system Water cooled
Output
- Power output 210–250 kW (282–335 hp)
- Torque output 600–700 N⋅m (443–516 lb⋅ft)
Applications
OM656 D29T R SCR
- 2017–2020 W222 S 350 d
- 2018–2020 C257 CLS 350 d
- 2018–2020 W213 E 350 d
- 2018–present W463 G 350 d
- 2019–present V167 GLE 350 d
- 2020–present X167 GLS 350 d
- 2021–present W223 S 350 d
OM656 D29T SCR
- 2017–2020 W222 S 400 d
- 2018–present C257 CLS 400 d 4MATIC
- 2018–present W213 E 400 d 4MATIC
- 2018-present W463 G 400 d
- 2019–present V167 GLE 400 d
- 2020–present X167 GLS 400 d
- 2021–present W223 S 400 d 4MATIC
Additional Applications
- CLS-Class C257 since 2018
- GLC-Class X253 since 2019
- GLE-Class W187 since 2018
- GLS-Class X167 since 2019
- G-Class W463 since 2019
- E-Class W213 since 2018
- S-Class W222 in 2017-2020
- S-Class W223 since 2020
OM656 Engine Disadvantages
Most OM656 issues are related to the Camtronic variable valve timing, in the event of a breakdown, the drive electromagnets, controlled camshaft and rocker change. The CR Bosch CP4 fuel system with piezo injectors will not tolerate bad diesel fuel as valves and cylinder head intake channels can get overgrown with soot.
Additionally: Environmental features like EGR, SCR and DPF can be troublesome.