M112 E32 Engine
M112 E32 is an engine from V6 range, first released in 1997 as a substitution to M104 E32. Other motors from 112-lineup are E24 M112, M112 E26, E28 M112, M112 E32 ML plus M112 E37.
Having V-shape with cylinder back’s angle of 90 degrees, motor was supplied with basic components of V8 M113. M112 features balancer shaft. Lighter aluminum cylinder block substituted heavy cast iron one. Keeping aluminum cylinder heads with single overhead camshaft plus 2 intake and 1 exhaust valves for each cylinder, motor gained 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 augment 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 output of 260 kW at 6,100 rpm and a torque of 450 Nm at 4,400 rpm.
In 2004, production of new generation of V6 motors started. M272 KE/DE 35 became the debut engine of the range.
M112 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.
Engine Applications
- 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
- 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 ventilation system.
- Oil leakage. Oil heat exchanger often has weak gasket. This problem is common for many M112 motors.
Written by Dan Hoffman
