Mercedes M102 2.0L Engine Specs, Problems, Reliability

Mercedes M102 2.0L Engine Specs, Problems, Reliability. The M102 engine came out to replace the old M115 engine in 1980. This 4 cylinders engine was constructed completely from scratch. It had brand-new cast iron cylinder block, aluminum 8-valve cylinder head with one camshaft. Late engines (till 1984) didn’t have hydraulic tappets/lifters. The diameter of intake valves is 43 mm and exhaust valve – 39 mm. The 2.0 l M102 from the beginning had the single-strand chain which was really undependable, but from 1987 this chain was changed by a double-row chain, and it operates extremely well.

Mercedes M102 2.0L Engine Specs

Mercedes M102 2.0L Engine Specs, Problems, Reliability

In 1984 engine got new light connecting rods and crankshaft along with hydraulic tappets/lifters and the new oil filter. Together with the inline four-cylinder engine, Mercedes produced the unified as much as possible inline six-cylinder engine – the M103 3.0 L.

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The production of the M102 engine stopped in 1994 and maker began producing the brand-new 2.0-liter M111 engine for their cars.

M102 E20/V20 2.0 l Engine Problems and Reliability

  1. Really short camshaft life (about 60-100,000 miles).
  2. Engine vibrations. That is the common problem for this engine. The issue on a regular basis is bad engine installs.
  3. The knocking after fired up is a distinct feature of M102 engines.

you must see more engine detail in here:  Engine – US Cars News or you can see on wiki here

Mercedes M102 2.0L Engine Specs

Manufacturer Stuttgart-Untertürkheim Plant
Production years 1980-1994
Cylinder block material Cast iron
Cylinder head material Aluminum
Fuel type Gasoline
Fuel system Carburetor / Injection
Configuration Inline
Number of cylinders 4
Valves per cylinder 2
Valvetrain layout SOHC
Bore, mm 89.0
Stroke, mm 80.25 or 80.2
Displacement, cc 1996 (1997)
Type of internal combustion engine Four-stroke, naturally aspirated
Compression Ratio 8 (9)
Power, hp 86-122/5000-5500
Torque, lb ft 122-131/2500-3500
Engine weight
Firing order 1-3-4-2
Engine oil weight 0W-30, 0W-40, 5W-30, 5W-40, 10W-40, 15W-40
Engine oil capacity, liter 4.5 (5.0 after 1984)
Oil change interval, mile 6,000
Applications Mercedes-Benz 190 W201, Mercedes-Benz E-Class W124, Mercedes-Benz G-Class W460, Mercedes-Benz G-Class W463, Mercedes-Benz W123
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Mercedes M102 2.0L Engine Modifications

  • M102.920 (1980 -1986) – the first carbureted variation for Mercedes W123. Carburetor is Stromberg 175 CDT, compression ratio is 9.
  • M102.921 (1982 -1984) – 920 with another camshaft and Stromberg 175 CD carburetor. This engine is for Mercedes 190 W201.
  • M102.922 (1985 -1990) – upgraded variation with new lighter crankshaft and conrods for Mercedes W124. Stromberg 175 CDT was replaced by Pierburg 2 E-E in 1986.
  • M102.926 (1982 -1993) – M102.921 geared up with injection system Bosch KE-Jetronic. Power is 122 hp (118 with catalyst). Mercedes 190 W201.