Engine Mercedes M166

4-cylinder Mercedes M166 engines from 1.4 to 2.1 liters were produced from 1997 to 2005 and were installed only on the compact A-class model and the Vaneo compact van, created on its basis. After upgrading to the next generation A-class, these units changed their index to M266.

R4 Mercedes engines: M102, M111, M166, M254, M260, M264, M266, M270, M271, M274, M282.

Specifications

Production years 1997-2005
Displacement, cc 1397 (M 166 E 14)
1598 (M 166 E 16)
1898 (M 166 E 19)
2084 (M 166 E 21)
Fuel system injector
Power output, hp 82 (M 166 E 14)
82 – 102 (M 166 E 16)
125 (M 166 E 19)
140 (M 166 E 21)
Torque output, Nm 130 (M 166 E 14)
140 – 150 (M 166 E 16)
180 (M 166 E 19)
205 (M 166 E 21)
Cylinder block aluminum R4
Block head aluminum 8v
Cylinder bore, mm 80 (M 166 E 14)
80 (M 166 E 16)
84 (M 166 E 19)
84 (M 166 E 21)
Piston stroke, mm 69.5 (M 166 E 14)
79.5 (M 166 E 16)
85.6 (M 166 E 19)
94 (M 166 E 21)
Compression ratio 11.0 (M 166 E 14)
11.0 (M 166 E 16)
10.8 (M 166 E 19)
11.0 (M 166 E 21)
Features SOHC
Hydraulic lifters yes
Timing drive chain
Phase regulator no
Turbocharging no
Recommended engine oil 5W-40
Engine oil capacity, liter 4.5
Fuel type petrol
Euro standards EURO 3/4
Fuel consumption, L/100 km (for Mercedes A140 2001)
— city
— highway
— combined
9.7
5.6
7.1
Engine lifespan, km ~230 000
Weight, kg 95

The engine was installed on:

  • Mercedes A-Class W168 in 1997 – 2004;
  • Mercedes Vaneo W414 in 2001 – 2005.

Disadvantages of the Mercedes M166 engine

  • The first years of production, the engines were equipped with an unreliable ECU with a built-in flow meter.
  • Corrosion and rapid wear of the cams and camshaft journals are also common here.
  • Due to cracked crankcase ventilation pipes, the smell of exhaust gases can be felt in the cabin.
  • The timing chain, generator, water pump and oil pump are distinguished by a low resource.
  • Due to the unusual design, many operations are carried out with the removal of the engine.

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