Mercedes-Benz M 166 / M 266

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Mercedes Benz
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M 166
Manufacturer: Mercedes Benz
Production period: 1997-2005
Working principle: Otto
Design: Inline four-cylinder
Engines: 1.4 liters (1397 cm³)
1.6 liters (1598 cm³)
1.9 liters (1898 cm³)
2.1 liters (2084 cm³)
Previous model: none
Successor: M 266
Mercedes Benz
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M 266
Manufacturer: Mercedes Benz
Production period: 2004–2012
Working principle: Otto
Design: Inline four-cylinder
Engines: 1.5 liters (1498 cm³)
1.7 liters (1699 cm³)
2.0 liters (2034 cm³)
Previous model: M 166
Successor: M 270

The M 166 is a four- cylinder in-line petrol engine from Mercedes-Benz , which was installed in the A-Class from 1997 and in the Vaneo from 2001 . The M 266 is the largely identical successor model that was installed in the A-Class and B-Class from 2004 .

With the new edition of the A- and B-Class from 2011 and 2012, respectively, these vehicles no longer have a sandwich floor. The successor engine to the M 266 is the M 270 .

The most comparable diesel engines with a similar shape are the OM 668 for the M166 and the OM 640 for the M266 .

technology

The petrol engine is an inline four-cylinder with eight valves and an overhead camshaft (OHC) driven by a timing chain . It has a light-alloy cylinder head and cylinder block, crankshaft with five bearings and electronically controlled fuel injection. It was specially developed for vehicles with the "sandwich" concept. In order to enable a more even weight distribution and the shortest possible front overhang (as well as a short overall length) of the vehicle, the engine is inclined at the front by 60 ° forwards (with its crankshaft center) behind the front axle. The crankcase and oil pan are already partially under the floor of the passenger cell ; in the event of a frontal crash, the engine slides under it to provide enough crumple zone for occupant protection. Only the cylinder head and the maintenance points are easily accessible in the engine compartment.

M 166

Engine* designation Displacement power Torque Remarks
M 166 E 14 166,940 1397 cc 60 kW (82 PS) at 5000 rpm 130 Nm at 3750 rpm
M 166 E 16 red. 166.960 red. 1598 cc 60 kW (82 PS) at 5000 rpm 140 Nm at 2500 rpm A-class with automatic and Vaneo
M 166 E 16 166.960 1598 cc 75 kW (102 PS) at 5250 rpm 150 Nm at 4000 rpm
M 166 E 19 166,990 1898 cc 92 kW (125 PS) at 5500 rpm 180 Nm at 4000 rpm
M 166 E 21 166.995 2084 cc 103 kW (140 PS) at 5500 rpm 205 Nm at 4000 rpm only A class

Planned versions with turbocharging and over 150 kW (200 hp) were put on hold because of the poorly dimensioned clutch of the A-Class.

As power transmission to the front axle , there were three different transmissions:

  • 5-speed manual transmission
  • 5-speed automatic converter
  • AKS gearbox (automatic clutch system)

In the AKS transmission, sensors on the gear lever control the clutch. The driver only needs to select the gears using the H shift while the clutch is controlled automatically.

M 266

Engine* designation Displacement power Torque Remarks
M 266 E 15 M 266.920 1498 cc 70 kW (95 PS) at 5200 rpm 140 Nm at 3500-4000 rpm A 150 / A 160
M 266 E 17 M 266.940 1699 cc 85 kW (116 hp) at 5500 rpm 155 Nm at 3500-4000 rpm A 170 / A 180
M 266 E 20 M 266.960 2034 cc 100 kW (136 hp) at 5500 rpm 185 Nm at 3500-4000 rpm
M 266 E 20 AL M 266.980 2034 cc 142 kW (193 hp) at 5000 rpm 280 Nm at 1800-4850 rpm only until 2010

 * Engine designation is coded as follows: M = engine (Otto), series = 3 digits, E = intake manifold injection, displacement = deciliters (rounded), A = exhaust gas turbocharger, L = charge air cooling

As power transmission to the front axle , there were three different transmissions:

  • 5-speed manual transmission (from predecessor M 166)
  • 6-speed manual transmission
  • CVT automatic transmission

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