Engine Mercedes OM441

The OM441 line of diesel power units was put into production at the end of 1987. To this day, it is one of the most powerful 6-cylinder engines, with only the 501 Series competing in this segment.

Since the 90s, OM 441 has firmly occupied a niche in the agricultural sector. Rational fuel consumption when connecting additional functions (with which the combine harvesters are equipped) allowed the concern to get several orders from leading manufacturers of agricultural machinery. The working volume of the 441th unit is 11.3 liters, and the power, depending on the modification, varies from 204 to 340 horsepower. To increase the performance of the motor, the developers applied:

  • Direct fuel supply;
  • Water cooling;
  • Larger cylinders;
  • Turbochargers;
  • 12 valves;
  • Timing OHV.

In addition to agricultural machinery, OM441 engines were installed on buses, medium-duty trucks and special-purpose vehicles.

Specifications

Engine’s type diesel
Power output, hp / kW 204-340 / 150-249
Displacement, cc 10964
Number of cylinders 6
Valves 12
Compression ratio (compression) 16.25:1
Cylinder bore, mm 128
Piston stroke, mm 142
Crankshaft bearings 4
Configuration V
Fuel type diesel
Fuel system inline injection pump
Turbine turbo / charge air cooler
Cylinder head OHV
Timing mechanism spur gear
Timing rocker arm
Cooling water

Frequent problems

One of the most common problems when operating the OM441LA is a malfunctioning fuel pump. The 441st is unpretentious in terms of fuel quality, but very capricious in relation to synthetic oil. Care should be taken to select the brand so as not to shorten the life of the unit. To replace a faulty fuel pump on this engine, it is enough to buy a high pressure fuel pump with a mechanical regulator. Although it is not as “sophisticated” as the electronic one, it is cheaper and can be repaired.

Explanation of marking

OM Heavy Fuel Oil (Diesel) ICE
441 Engine Series: V-6
L Charge air cooling.
A Exhaust turbocharger.

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