Engine Mercedes OM617

The OM617 engine is a 5-cylinder indirect injection diesel in-line engine from Daimler-Benz. Its production started in 1974. It is a direct continuation of the 4-cylinder engine OM616 and differs from it only in the additional cylinder.

OM617 is considered one of the most reliable engines, often reaching over 1,000,000 km, which is one of the key reasons for Mercedes’ popularity in North America in the 1980s.

The turbocharged engine was the first diesel engine suitable for use in S-class and mid-range cars. Daimler-Benz was interested in meeting the fuel consumption targets set by the US government. This is how the 300 SD (S-Class Diesel) and 300 CD (Coupe Diesel) models appeared, the first (S-Class W 116, Coupe C 123) and the second body version (S-Class 126 series).

Specifications

OM 617 1974
Displacement 3005 cc
Fuel system precombustion chamber injection
Power output 80 hp
Torque output 172 Nm
Cylinder block cast iron R5
Cylinder head cast iron 10v
Cylinder bore 91 mm
Piston stroke 92.4 mm
Compression ratio 21
Engine features no
Hydraulic compensators no
Timing drive double-row chain
Phase regulator no
Turbocharging no
Recommended engine oil 6.5 liters 5W-40
Fuel type diesel
Euro standards Euro 0
Engine lifespan 600 000 km
OM 617 1979
Displacement 2998 cc
Fuel system precombustion chamber injection
Power output 88 hp
Torque output 172 Nm
Cylinder block cast iron R5
Cylinder head cast iron 10v
Cylinder bore 90.9 mm
Piston stroke 92.4 mm
Compression ratio 21.5
Engine features no
Hydraulic compensators no
Timing drive chain
Phase regulator no
Turbocharging no
Recommended engine oil 6.5 liters 5W-40
Fuel type diesel
Euro standards Euro 0
Engine lifespan 550 000 km
TURBO OM 617 A 1979
Displacement 2998 cc
Fuel system precombustion chamber injection
Power output 115 hp
Torque output 250 Nm
Cylinder block cast iron R5
Cylinder head cast iron 10v
Cylinder bore 90.9 mm
Piston stroke 92.4 mm
Compression ratio 21.5
Engine features no
Hydraulic compensators no
Timing drive chain
Phase regulator no
Turbocharging yes
Recommended engine oil 6.5 liters 5W-40
Fuel type diesel
Euro standards Euro 0
Engine lifespan 500 000 km
TURBO OM 617 A 1982
Displacement 2998 cc
Fuel system precombustion chamber injection
Power output 125 hp
Torque output 250 Nm
Cylinder block cast iron R5
Cylinder head cast iron 10v
Cylinder bore 90.9 mm
Piston stroke 92.4 mm
Compression ratio 21.5
Engine features no
Hydraulic compensators no
Timing drive chain
Phase regulator no
Turbocharging yes
Recommended engine oil 6.5 liters 5W-40
Fuel type diesel
Euro standards Euro 0/1
Engine lifespan 450 000 km

Frequent problems

These diesel engines are considered to be very reliable, but they are noisy and vibrated. The most common problem with this unit is a leaking crankshaft rear oil seal.

The resource of the timing chain, as well as dampers, rarely exceeds 200-250 thousand kilometers. In terms of fuel equipment, the pumping pump of the high-pressure fuel pump sometimes fails. A number of engines of the first years of production had defects in casting and low-quality turbines.

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