Mercedes-Benz OM904 engine

The Mercedes-Benz OM904 is a 4.2 liter (4,249cc) Inline-four engine (I4) OHV Diesel engine with 3 valves per cylinder.[1] It is related to the OM906 Straight-six engine which has two extra cylinders, while the bore and stroke remain unchanged.[2]

It launched in 1996 and had a Unit injector system to deliver fuel to every cylinder. It used a twin-scroll Turbocharger that was giving ~0.5-1.4atm of boost.[3]

Engine Details
Power: 75-130kW (101-174hp) @ 2,200 rpm Height: 930mm (36.6in)
Torque: 400-670Nm (295-494lb.ft) @ 1,200-1,600 rpm Weight: 405kg (893lbs)
Aspiration: Twin-scroll turbocharger, intercooler Injection: Direct injection
Compression Ratio: 18:1 Boost: 0.5-1.4atm
Bore: 102mm (4in) Launch Year: 1996
Stroke: 130mm (5.1in)
Displacement: 4,249cc (259.3CI)
Redline: 2,300
Length: 944mm (37.2in)
Width: 610mm (24in)
  1. ^ "Diesel Engine OM 904". www.idem.ir. Retrieved 2019-09-13.
  2. ^ "Mercedes OM904 - OM906 engine specs, bolt torques, manuals". barringtondieselclub.co.za. Retrieved 2019-09-13.
  3. ^ "The history of medium-duty engines at Mercedes-Benz". www.fleetnews.co.uk. Retrieved 2019-09-14.