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.
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.
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
- Really short camshaft life (about 60-100,000 miles).
- Engine vibrations. That is the common problem for this engine. The issue on a regular basis is bad engine installs.
- The knocking after fired up is a distinct feature of M102 engines.
Mercedes M102 2.0L Engine Specs
|Cylinder block material||Cast iron|
|Cylinder head material||Aluminum|
|Fuel system||Carburetor / Injection|
|Number of cylinders||4|
|Valves per cylinder||2|
|Stroke, mm||80.25 or 80.2|
|Displacement, cc||1996 (1997)|
|Type of internal combustion engine||Four-stroke, naturally aspirated|
|Compression Ratio||8 (9)|
|Torque, lb ft||122-131/2500-3500|
|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|
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.