Mercedes-Benz OM628 engine

The Mercedes-Benz OM628 engine is a turbocharged diesel V8 engine produced by Mercedes-Benz, from 1999 to 2005.

Mercedes-Benz OM628
Overview
Manufacturer	Mercedes-Benz
Production	1999–2005
Layout
Configuration	75° V8
Displacement	4.0 L (3,996 cc)
Cylinder bore	86 mm (3.39 in)
Piston stroke	86 mm (3.39 in)
Cylinder block material	Aluminium alloy
Cylinder head material	Aluminium alloy
Valvetrain	DOHC 4 valves x cyl.
Compression ratio	18.5:1
Combustion
Turbocharger	Garrett GT1749V
Fuel system	Common rail
Fuel type	Diesel
Cooling system	Water cooled
Output
Power output	184–191 kW (250–260 PS; 247–256 hp)
Torque output	560 N⋅m (413 lb⋅ft)
Chronology
Successor	Mercedes-Benz OM629 engine

Design

The OM628 was created in response to competing V8 diesel engines produced by Audi and BMW.^[1] It first appeared in the W220 S400 CDI and was subsequently the first V8 diesel engine in a Mercedes passenger vehicle. The OM628 engine features dual overhead camshafts, 4 valves per cylinder, exhaust gas recirculation, a Garrett GT1749V turbocharger, and Euro 4 emissions compliance.^[2] The engine block and cylinder heads are made from an aluminium alloy, via the sand-casting process.

Models

Engine	Power	@ rpm	Torque	@ rpm	Years
OM628 DE40 LA	184 kW (250 PS; 247 hp)	4,000	560 N⋅m (413 lb⋅ft)	1,700–2,600	1999–2005
	191 kW (260 PS; 256 hp)				2003–2005

OM628 (184 kW version)

• 1999–2003 W220 S400 CDI^[3]
• 2001–2005 W163 ML400 CDI^[4]
• 2001–2005 W463 G400 CDI^[5]

OM628 (191 kW version)

• 2003–2005 W211 E400 CDI^[6]
• 2003–2005 W220 S400 CDI^[7]