Engine Mercedes OM622

The OM622 engine is a 1598 cc 3 inline 4-cylinder diesel engine with common rail direct injection technology. The cylinder diameter is 80 mm and the piston stroke is 79.5 mm. The Compression ratio is 15.4:1. The engine crankcase is made of cast iron, the cylinder head is made of aluminum alloy.

Mercedes-Benz OM 622 is a modification of the OM 626 engine with reduced performance characteristics, specially designed for use in minibuses. The working volume remained unchanged, but the layout has changed, due to which the power unit is installed transversely with a drive on the front wheels. Engine power has decreased and varies from 88 to 114 hp.


Engine’s type diesel
Tradename OM 622 DE 16
Power, hp / kW 88-114 / 65-84
Displacement, cc 1598
Number of cylinders 4
Number of valves 16
Compression ratio 15.4:1
Cylinder bore, mm 80
Piston stroke, mm 79.5
Crankshaft bearings 5
Configuration inline
Fuel type diesel fuel
Combustible mixture supply direct injection
Turbine turbocharger
Cylinder head DOHC
Timing mechanism spur gear
Cooling water

The engine is equipped with a cast iron crankcase, the cylinder head is made of aluminum alloy. The pistons are made of steel, which is a feature of these engines, because most modern diesel units use aluminum pistons. Timing – type DOHC. In other words, there are 4 valves per cylinder and 2 overhead camshafts.

The outlet system uses a VTG variable length rotary engine. The turbine size is 37.5 mm. The movement of the turbocharger blades is controlled by a vacuum chamber. The latter receives signals from the electrical converter CU. The outlet is also equipped with an EGR valve. First, the outlet gases enter the filter, are cooled, and then fed to the compressor. Then the selective neutralizer processes them. All this is done with the aim of meeting European environmental standards as much as possible.

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