Mercedes-Benz OM646 engine

The OM646 is a turbocharged inline-four engine produced between 2002 and 2010 by Mercedes-Benz.

Mercedes-Benz OM646
Overview
Manufacturer	Mercedes-Benz
Production	2002–2010
Layout
Configuration	Inline-four engine
Displacement	2.1 L (2,148 cc)
Cylinder bore	88 mm (3.46 in)
Piston stroke	88.3 mm (3.48 in)
Cylinder block material	Cast iron
Cylinder head material	Aluminium alloy
Valvetrain	DOHC
Compression ratio	17.5:1 (DE22 LA EVO), 18.0:1
Combustion
Turbocharger	Single
Fuel system	Common rail
Fuel type	Diesel
Cooling system	Water cooled
Output
Power output	65–125 kW (88–170 PS; 87–168 hp)
Torque output	220–400 N⋅m (162–295 lb⋅ft)
Emissions
Emissions target standard	Euro 4
Emissions control systems	EGR, DPF
Chronology
Predecessor	Mercedes-Benz OM611 engine
Successor	Mercedes-Benz OM651 engine

Design

The OM646 engine is sold under the 200 CDI and 220 CDI designation and features an electric fuel pump, exhaust gas recirculation, particulate filters,^[1] and Euro 4 emission standard compliance (from 2003).^[2] In 2006, the engine was updated under the EVO name and replaced the OM647 engine. It features a reduced compression ratio of 17.5:1, a new turbocharger, and ceramic glow plugs for improved engine starts.^[3]

Models

Engine	Power	Torque	Years
OM646 DE22 LA R	65 kW (88 PS; 87 hp) @ 3,800 rpm	220 N⋅m (162 lb⋅ft) @ 1,400–2,500 rpm	2003–2010
	70 kW (95 PS; 94 hp) @ 3,800 rpm	250 N⋅m (184 lb⋅ft) @ 1,400–2,600 rpm	2006–2010
	80 kW (109 PS; 107 hp) @ 3,800 rpm	270 N⋅m (199 lb⋅ft) @ 1,600–2,600 rpm	2003–2010
	85 kW (116 PS; 114 hp) @ 3,800 rpm	290 N⋅m (214 lb⋅ft) @ 1,600–2,600 rpm	2006–2010
OM646 DE22 LA R	90 kW (122 PS; 121 hp) @ 4,200 rpm	270 N⋅m (199 lb⋅ft) @ 1,400–2,800 rpm	2003–2010
OM646 DE22 LA	65 kW (88 PS; 87 hp) @ 3,800 rpm	220 N⋅m (162 lb⋅ft) @ 1,600–2,600 rpm	2006–2009
	80 kW (109 PS; 107 hp) @ 3,800 rpm	280 N⋅m (207 lb⋅ft) @ 1,600–2,400 rpm
	95 kW (129 PS; 127 hp) @ 3,800 rpm	305 N⋅m (225 lb⋅ft) @ 1,200–2,400 rpm
	105 kW (143 PS; 141 hp) @ 4,200 rpm	340 N⋅m (251 lb⋅ft) @ 2,000 rpm	2003–2004
OM646 DE22 LA	110 kW (150 PS; 148 hp) @ 3,800–4,200 rpm	330 N⋅m (243 lb⋅ft) @ 1,200–2,400 rpm	2003–2010
OM646 DE22 LA EVO R	100 kW (136 PS; 134 hp) @ 3,800 rpm	270 N⋅m (199 lb⋅ft) @ 1,600–3,000 rpm	2007–2009
		340 N⋅m (251 lb⋅ft) @ 2,000 rpm	2006–2009
OM646 DE22 LA EVO	125 kW (170 PS; 168 hp) @ 3,800 rpm	400 N⋅m (295 lb⋅ft) @ 2,000 rpm

OM646 DE22 LA R

• 2003–2006 W211 E200 CDI
• 2003–2007 W203 C200 CDI
• 2003–2010 W639 Vito 109 CDI, 111 CDI, 2.0 CDI
• 2008–2010 CL203 CLC200 CDI
• 2003-2009 Chrysler PT Cruiser

OM646 DE22 LA

• 2002–2006 W211 E220 CDI
• 2004–2007 W203 C220 CDI
• 2003–2010 W639 Vito 115 CDI, 2.2 CDI
• 2005–2010 C209 CLK220 CDI
• 2006–2009 W906 Sprinter 209-516 CDI
• 2008–2010 CL203 CLC220 CDI
• 2010–2013 Vito (Chinese market; known as OM646 980)
• 2003–2009 Chrysler PT Cruiser

OM646 DE 22 LA EVO R

• 2006–2009 W211 E200 CDI
• 2007–2009 W204 C200 CDI

OM646 DE 22 LA EVO

• 2006–2009 W211 E220 CDI
• 2007–2009 W204 C220 CDI

References

1. Klose, Steane (2008-04-11). "Mercedes Benz reveals new range of four cylinder diesels". The Motor Report. Retrieved 2018-07-06.
2. "Mercedes C200 CDI estate review | Autocar". www.autocar.co.uk. Retrieved 2018-07-06.
3. "Mercedes-Benz OM646, OM647 and OM648 engines". australiancar.reviews. Retrieved 2018-07-06.