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.
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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.
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 |
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.
