Mercedes-Benz OM 622 / OM 626 diesel engines

Mercedes Benz
OM 626, OM 622
Manufacturer:	Daimler AG
Production period:	2014-2018
Style:	Four-cylinder in - line engine
Engines:	1.6 liters (1598 cm³)
Previous model:	none
Similar models:	Renault R9M
Successor:	OM 654 D16

The engines OM 622 and OM 626 are four-cylinder - diesel engines of Daimler AG and come from the strategic cooperation with Renault-Nissan . The OM 626 was first used in autumn 2014 in two models of the C-Class (205 series) .

The basic engine is identical to the R9M Renault engine and is produced by Renault in the factory in Cléon (France) . The engine is then completed at the Mercedes plant in Bremen. Among Mercedes-specific components include the start-stop function, the ancillaries ( air conditioning compressor and generator ), a special dual-mass flywheel, a modified engine control unit with additional features and exhaust aftertreatment.

Technology 

Basic engine 

The displacement of the four - cylinder in-line engine is 1598 cc with a bore of 80 mm and a stroke of 79.5 mm, with a cylinder spacing of 88 mm. The crankcase of the engine is made of gray cast iron, the cylinder head of an aluminum alloy.

The OM 626 and Renault R9M are among the world's first passenger car diesel engines with steel pistons instead of aluminum pistons. Steel pistons with reduced-tension piston rings from the supplier Mahle are used. Steel pistons are said to bring advantages in terms of fuel economy and strength over aluminum pistons thanks to lower friction and better thermal behavior. 

The charge cycle is controlled by four valves per cylinder ( four-valve technology ) and two overhead camshafts ( DOHC ).

The engine has an exhaust turbocharger with variable turbine geometry . The turbine wheel of the VTG loader is 37.5 millimeters in diameter smaller than the compressor wheel with 45 millimeters in diameter. The adjustment of the guide vanes takes over a vacuum box, which is controlled via an electropneumatic pressure transducer from the engine control unit.

Furthermore, the engine has a cooled low-pressure exhaust gas recirculation (EGR) . The exhaust gas is removed behind the particle filter, cooled and re-introduced before the compressor.

Exhaust gas aftertreatment takes place with the aid of an SCR system .The common-rail injection works with a fuel pressure up to 1600 bar.

OM 622 DE 16 LA

The OM 622 is based on the reduced-power version of the Renault R9M, which has been specially adapted for use in transporters, and is installed on the lower-power front-wheel drive versions of the lower-power versions of the Vito . There are 2 power levels with 65 kW and 84 kW.

OM 626 DE 16 LA red. 

Unlike the Renault engines and the OM 622, the OM 626 is mounted longitudinally in conjunction with rear-wheel drive, the OM 626 is offered in two output stages with 85 and 100 kW.

OM 626 DE 16 LA