Mercedes M104 3.2L Engine Specs, Problems, Reliability. The M104 E32 3.2-liter engine is the last and most significant inline six-cylinder engine produced by Mercedes (AMG made the M104 E34 and M104 E36). It appeared in 1991. The 3.0-liter M104 was the start point for the new 3.2 l version.
The primary differences are the new cylinder block, brand-new 89.9 mm pistons and brand-new crankshaft with bigger 84 mm stroke. The cylinder head is the same as M104 E30 with 4 valves per cylinder. The engine has trusted double-strand chain unlike the single-strand chain on the old M103 engine. In 1992 the engine got variable geometry consumption manifold.
The manufacturer produced the 2.8-liter and 3.0-liter versions also (M104 E30 and M104 E28). The next generation of 6-cylinder engines got V setup. V6 engines released in 1997 as M112 series (3.2-liter engine is M112 E32).
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M104 E32 3.2 l Engine Problems and Reliability
1. Oil leakages from gaskets under the cylinder head cover and oil filter.
2. Engine overheat. If engine started to get too hot, examine the condition of the radiator or the viscous fan coupling.
The premium oil and gasoline, and routine upkeep will extend the life of the M104 engine. This engine is one of the most dependable Mercedes-Benz engines.
you must see more engine detail in here: Engine – US Cars News or you can see on wiki here
Mercedes M104 3.2L Engine Specs
| Manufacturer | Stuttgart-Bad Cannstatt Plant |
| Production years | 1991-1998 |
| Cylinder block material | Cast iron |
| Cylinder head material | Aluminum |
| Fuel type | Gasoline |
| Fuel system | Fuel Injection |
| Configuration | Inline |
| Number of cylinders | 6 |
| Valves per cylinder | 4 |
| Valvetrain layout | DOHC |
| Bore, mm | 89.9 |
| Stroke, mm | 84.0 |
| Displacement, cc | 3199 |
| Type of internal combustion engine | Four-stroke, naturally aspirated |
| Compression Ratio | 9.2 (10) |
| Power, hp | 220-231/5500-5800 |
| Torque, lb ft | 229-232/3750-4100 |
| Engine weight | – |
| Firing order | 1-5-3-6-2-4 |
| Engine oil weight | 0W-30, 0W-40, 5W-30, 5W-40, 5W-50, 10W-40, 10W-50, 15W-40, 15W-50 |
| Engine oil capacity, liter | 7.5 |
| Oil change interval, mile | 6,000 |
| Applications | Mercedes-Benz 320 E / E 320 W124, Mercedes-Benz E 320 W210, Mercedes-Benz 300 SE W140, Mercedes-Benz S 320 W140, Mercedes-Benz SL 320 R129 |
Mercedes M104 3.2L Modifications
M104.990 – 231 hp engine for Mercedes-Benz 300 SE/SEL W140 (1991-1993).
M104.991 – the same M104.990 but for Mercedes-Benz SL320 R129.
M104.992 – M104.991 with compression ratio 9.2, power is 220 hp. Engine is for Mercedes-Benz 320 E W124, E320 W124 (1992-1997).
M104.994 – M104.990 engine with another intake manifold. It power is 231 hp and torque – 231 lb-ft. Mercedes-Benz S 320 W140 (1993-1998).
M104.995 – 220 hp and 231 lb-ft engine for Mercedes-Benz E 320 W210 (1995-1997).
