Mercedes-Benz OM 651 Service Manual

10
Overview
Introduction of New Generation of 4-Cylinder Inline Engines, OM 651
q
System comparison
Comparison Engine 646.821EVO
C 220 CDI
Engine 651.911
C 250 CDI
Market launch 06 / 2006 10 / 2008
Combustion system Diesel direct injection
No. of cylinders 4
Engine configuration Inline
Bore mm 88.3 83.0
Stroke mm 88.3 99.0
Compression ratio e 16.5:1 16.2:1
Camshafts – drive Duplex chain Simplex chain
Camshafts – number 2 2
Valve actuation Cup tappet
with hydraulic valve
clearance compensation
Roller-type cam follower
with hydraulic valve
clearance compensation
Turbocharger type 1-stage turbocharging with
variable turbine geometry
2-stage turbocharging with
fixed geometry
Boost pressure control Electric Pneumatic
Measures for low-emission
combustion
Intake port shutoff,
exhaust gas recirculation
(EGR) with separate EGR
cooler
Intake port shutoff, EGR
cooling and EGR bypass
Fuel injector – type Solenoid injector Directly controlled piezo
injector
Fuel injector – diameter mm 17 19
Firing order 1-3-4-2
Oil pump – drive Simplex chain Gear drive
Alternator – current rating A 200 180
Engine weight DIN (dry) approx. kg 190 203
– This printout will not be recorded by the update service. Status: 09 / 2008 –

Mercedes-Benz OM 651 Specifications

General

Brand	Mercedes-Benz
Model	OM 651
Category	Engine
Language	English