| Mercedes-Benz OM656 | |
| Manufacturer: | Mercedes-Benz |
| Production: | 2017–present |
| Configuration: | Straight-six engine |
| Displacement: | 2927.8cc |
| Bore: | 82mm |
| Stroke: | 92.4mm |
| Block: | Aluminium alloy |
| Head: | Aluminium alloy |
| Valvetrain: | DOHC 4 valves x cyl. with VVT |
| Compression: | 15.5:1 |
| Supercharger: | BorgWarner eBooster electrically driven compressor |
| Turbocharger: | Single-turbo |
| Fuelsystem: | Common rail direct injection |
| Fueltype: | Diesel |
| Coolingsystem: | Water cooled |
| Power: | NaN0NaN0 |
| Torque: | NaN0NaN0 |
The OM656 is a turbocharged diesel engine produced by Mercedes-Benz since 2017. It was first introduced in the facelift W222 S-Class.[1]
The OM656 is based on a modular design that is shared with other 4-cylinder and 6-cylinder, petrol and diesel engines.[2] It is the replacement to the previous V6,[3] in order to maintain the cost of production between different engines. The OM656 has dual overhead camshafts with variable valve timing, and uses AdBlue injection and exhaust gas recirculation to reduce emissions.[4] The cylinder walls are coated with arc sprayed steel whose increased porosity aids oil film strength to reduce friction.[5] [6]
| Engine | Power | Torque | Years |
|---|---|---|---|
| OM656 D29T R SCR | 2100NaN0 at 3,400–4,600 rpm | 6000NaN0 at 1,200–3,200 rpm | 2017–[7] |
| OM656 D29T SCR | 2500NaN0 at 3,600–4,400 rpm | 7000NaN0 at 1,200–3,200 rpm |