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M112 E32 is an engine from the V6 range, first released in 1997 as a substitution for M104 E32. Other motors from 112-lineup are E24 M112, M112 E26, E28 M112, M112 E32 ML plus M112 E37.
Having V-shape with a cylinder back’s angle of 90 degrees, the motor was supplied with basic components of V8 M113. M112 features a balancer shaft. A lighter aluminum cylinder block substituted heavy cast iron one. Keeping aluminum cylinder heads with a single overhead camshaft plus 2 intakes and 1 exhaust valve for each cylinder, the motor gained a variable valve timing system, hydraulic lifters/tappets, variable geometry intake manifold, and timing chain.
Supercharged M112.961 had some differences from the traditional version. They are:
- Restyled crankshaft featuring bearings suitable for high torque;
- Updated connecting rods;
- Heat-resistant covering of pistons able to resist high pressure of up to 90 bar;
- Upgraded balancer shaft;
- Bigger oil pump for augmenting oil supply to oil nozzles with 70% better output;
- Light mounted camshafts;
- Stronger valve springs to enhance rpm from 6,000 to 6,220 along with valve power;
- Air pressure sensor substituted classic hot-film air mass meter;
- Exceptional exhaust system featuring 4 ceramic catalytic converters.
Engines, based on M112.960, were applied for Chrysler Crossfire Coupe SRT-6 and Crossfire Roadster SRT-6. Though Chrysler Crossfire STR-6 motor had 1.0 bar maximum boost pressure and reached 246 kW at 6,100 rpm and a torque of 420 Nm at 3,500-4,800 rpm unlike C32 AMG and SLK32 AMG with an output of 260 kW at 6,100 rpm and a torque of 450 Nm at 4,400 rpm.
In 2004, the production of a new generation of V6 motors started. M272 KE/DE 35 became the debut engine of the range.
M112 Engine Specs
| Manufacturer | Stuttgart-Bad Cannstatt Plant |
| Production years | 1997-present day |
| Cylinder block material | Aluminum |
| Cylinder head material | Aluminum |
| Fuel type | Gasoline |
| Fuel system | Fuel injection |
| Configuration | V |
| Number of cylinders | 6 |
| Valves per cylinder | 3 |
| Valvetrain layout | SOHC |
| Bore, mm | 89.9 |
| Stroke, mm | 84.0 |
| Displacement, cc | 3199 |
| Type of internal combustion engine | Four-stroke, naturally aspirated |
| Compression Ratio | 10 |
| Power, hp | 190/5600 218/5700 224/5600 |
| Torque, lb ft | 199/2750 229/3000 232/3000 |
| Firing order | 1-4-3-6-2-5 |
| 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 | 8.0 |
| Oil change interval, mile | 6,000 |
Engine Modifications
- M112.940 (1997 – 2003) – version with power of 218 hp at 5700 rpm. This motor for Mercedes-Benz CLK 320 C208.
- M112.941 (1997 – 2002) – for Mercedes-Benz E 320 W210. Power is 224 hp.
- M112.942 (1997 – 2005) – M112.940 for Mercedes-Benz ML 320 W163.
- M112.944 (1998 – 2002) – M112.941 for Mercedes-Benz S 320 W220.
- M112.951 (2003 – present day) – version for Mercedes-Benz Vito 119/Viano 3.0 W639, 190 hp.
What Cars Have A Mercedes M112 Engine?
- 2000–2004 Mercedes C320
- 1998–2005 Mercedes E320
- 1997-200.. Mercedes G320
- 1998–2005 Mercedes S320
- 1998–2003 Mercedes ML320
- 2000–2003 Mercedes SLK320
- 2003–2008 Mercedes Chrysler Crossfire
- 2002–2005 Mercedes CLK320
M112 E32 Engine Problems And Reliability
- Excessive oil use. Outwear of valve stem gaskets may be the major reason for that. Or, this malfunction may be caused by crankcase gases, contaminating the ventilation system.
- Oil leakage. The oil heat exchanger often has a weak gasket. This problem is common for many M112 motors.
