Engines
2000s
Germany

Mercedes-Benz OM 639 / OM 640 diesel engine 

2004 to 2012

diesel engine 2004 to 2012

 

 The OM 640 is a diesel engine with four cylinders arranged in series by Mercedes-Benz . This was installed from 2004 to 2012 in the A and B class . The most comparable to the OM 640 gasoline engine with a similar shape is the M 266 , its predecessor was the OM 668 .

Technology

The OM 640 has one common-rail injection and four valves per cylinder. All variants are equipped with engine charging and intercooling. As usual with Mercedes, the overhead camshafts are driven by two timing chains .

The motor is inclined forwards by approx. 60 ° and is installed transversely behind the driven front axle on vehicles with sandwich floor . Power is transmitted via a manual gearbox with five (160 CDI) or six gears (180 CDI and 200 CDI) or via the continuously variable Autotronic . The engine and transmission could only be used in these vehicles due to their unusual installation position.

OM 640 

Engine designation capacity Bore · stroke Compression 
ratio		 power torque model
OM 640 DE 20 LA red. 640942 1991 cm³ 83 x 92 mm 18: 1 60 kW (82 hp) at 4200 rpm 180 Nm at 1400-2600 / min A 160 CDI
OM 640 DE 20 LA red. 640940 1991 cm³ 83 x 92 mm 18: 1 80 kW (109 hp) at 4200 rpm 250 Nm at 1600-2600 / min A 180 CDI, B 180 CDI
OM 640 DE 20 LA 640941 1991 cm³ 83 x 92 mm 18: 1 103 kW (140 hp) at 4200 rpm 300 Nm at 1600-3000 / min A 200 CDI, B 200 CDI

OM 639 

On the basis of the OM 640, a version capped by a cylinder was used in the 2004 Smart Forfour and Mitsubishi Colt . Also, the OM 639 has timing chains and a common-rail injection, with the exception of the missing fourth cylinder, data such as bore and stroke are identical. However, the installation position is typical for front-wheel drive: engine standing transversely in front of the front axle. It was offered in two performance levels:

Engine capacity Hole · Hub compression ratio power torque model
OM 639 DE 15 LA red. 1493 cm³ 83 x 92 mm 18: 1 50 kW (68 hp) at 4000 rpm 160 Nm at 1600 rpm forfour cdi
OM 639 DE 15 LA 1493 cm³ 83 x 92 mm 18: 1 70 kW (95 hp) at 4000 rpm 210 Nm at 1800 rpm forfour 1.5 cdi
Related items
MCC Smart Related | Mitsubishi Colt | Mercedes diesel engines | Mercedes B-Class | Diesel engines | Mercedes A-Class

Technical

Technical

  • Mercedes OM 639 640 engine Technical details and specifications (2004-2012)

    Mercedes-Benz 2.0D Engine code: OM 640

    No. of cylinders 4/DOHC 
    Capacity 1991 cc
    Compression ratio 18.0:1
    Injection sequence 1-3-4-2
    Injection Nozzle opening pressure -1600 bar
    Glow plug activation time 3 secs
    Oil pressure 3.0 bar @ 2000 rpm

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