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  • Mercedes M 112 engine (1997-2005)
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History

Mercedes-Benz M112 V6 petrol engine

Mercedes-Benz / AMG
Mercedes-Benz M112 V6 petrol engine
Manufacturer: Mercedes-Benz / AMG
Production period: 1997-2005
Style: V , six-cylinder
Engines: 2.4 liters (2398 cc) 
to 3.7 liters (3724 cc)
Previous model: M 104
Successor: M 272

The M 112 is a V6 - gasoline engine from Mercedes-Benz , which in March 1997 in the E-Class of the 210 series was introduced. This replaced the M 104 . In 2004, the successor M 272 was introduced.

The M 112 is technically closely related to the V8 M 113 . Both have a cylinder spacing of 106 mm and an angle of 90 ° between the cylinder banks. They can be made in large part on the same production facilities, and there are many identical parts. Both have an engine block made of light alloy with cast-in cylinder liners made of Silitec ( Al - Si - alloy ), and a light alloy cylinder head having an overhead camshaft per cylinder bank.

The four-bearing crankshaft has split crank pins for uniform firing intervals of 120 ° crank angle. They sit directly next to each other without intermediate cheeks in order not to have to increase the offset of the cylinder banks and thus the overall length of the engine. Above the crankshaft in the cylinder V sits a balancer shaft , which rotates counter to the crankshaft at the same speed. As a result, the mass forces and moments of the first order are completely compensated. Camshafts and balance shaft are driven by a double roller chain.

Like the M 113, the M 112 has two intake valves and one exhaust valve per cylinder , which are operated via light metal roller rocker arms with hydraulic lash adjuster. By the single exhaust valve results in a smaller surface of the exhaust passage and thereby less heat emission of the exhaust gas to the cylinder head, especially when the engine is cold. The catalyst thus reaches its operating temperature faster. The thin and double-walled sheet metal exhaust manifolds , which absorb little heat, also contribute to this.

Each combustion chamber has two spark plugs on the right and left of the exhaust valve. The arrangement of valves and candles is symmetrical. The double ignition operates with time-shifted control of the two candles. This achieves a fast and uniform combustion, greater safety against combustion misfires and higher tolerance against Gemischabmagerung and exhaust gas recirculation . Because of the double ignition, the heat load of the pistonis rising, this is cooled by oil spray nozzles, inject the engine oil from below against the piston crown. The candles in each combustion chamber are also controlled from one cycle to the next in alternating order. This results in a more uniform and lower heat load on the piston and even burning of both candles.

M 112 there was with 2.4 to 3.7  liter capacity .

Technical Data

engine designation Bore × stroke 
[mm]
Displacement 
[cm 3 ]
compression Power [kW / hp] 
at speed [rpm]
Torque [Nm] 
at speed [rpm]
M 112 E 24 83.2 × 73.5 2398 10.0: 1 125/170 at 5900 225 at 3000-5000
M 112 E 26 89.9 × 68.2 2597 11.0: 1 125/170 at 5500 240 at 4500
M 112 E 28 89.9 × 73.5 2799 10.0: 1 150/204 at 5700 270 at 3000-5000
M 112 E 32 89.9 × 84 3199 10.0: 1 140/190 at 5600 270 at 2750-4750
M 112 E 32 89.9 × 84 3199 10.0: 1 160/218 at 5700 310 at 3000-4600
M 112 E 32 89.9 × 84 3199 10.0: 1 165/224 at 5600 315 at 3000-4800
M 112 E 32 ML 89.9 × 84 3199 9.0: 1 260/354 at 6100 450 at 4400
M 112 E 37 97 × 84 3724 10.0: 1 170/231 at 5600 345 at 2500-4500
M 112 E 37 97 × 84 3724 10.0: 1 173/235 at 5750 345 at 3000-4500
M 112 E 37 97 × 84 3724 10.0: 1 180/245 at 5750 350 at 3000-4500


Use 

M 112 E 24

Designation model series Construction
Displacement: 2398 cc, Power: 125 kW (170 hp) at 5900 rpm, Torque: 225 Nm at 3000-5000 / min
C 240 W / S 202 1997-2000
E 240 W / S 210 1997-2000

M 112 E 26

Designation model series Construction
Capacity: 2597 cc, power: 125 kW (170 hp) at 5500 rpm, torque: 240 Nm at 4500 rpm
C 240T S 202 2000-2001
C 240 W / S 203 2000-2005
CLK 240 C / A 209 2002-2005
E 240 W / S 210 2000-2002
Capacity: 2597 cc, power: 130 kW (177 hp) at 5750 rpm, torque: 240 Nm at 4500 rpm
E 240 W / S 211 2002-2006

M 112 E 28 

Designation model series Construction
Displacement: 2799 cc, Power: 145 kW (197 hp) at 5800 rpm, Torque: 265 Nm at 3000 rpm
C 280 W / S 202 1997-2000
Capacity: 2799 cc, power: 150 kW (204 hp) at 5700 rpm, torque: 270 Nm at 3000-5000 rpm
SL 280 R 129 1998-2001
E 280 W / S 210 1997-2002
S 280 W 220 1998-2005

M 112 E 32 

Designation model series Construction
Capacity: 3199 cc, power: 140 kW (190 hp) at 5600 rpm, torque: 270 Nm at 2750-4750 rpm
Viano 3.0 / Viano 119 W / V 639 2003-2008 / since 2010
Capacity: 3199 cc, power: 160 kW (218 hp) at 5600 rpm, torque: 305 Nm at 2800-4750 rpm
Viano 3.2 / Viano 122 W / V 639 2003-2004
Displacement: 3199 cc, Power: 160 kW (218 hp) at 5700 rpm, Torque: 310 Nm at 3000-4600 / min
ML 320 W 163 1997-2002
SLK 320 R 170 2000-2004
C 320 W / S 203 2000-2005
CLK 320 C / A 208 1997-2003
CLK 320 C / A 209 2002-2005
Chrysler Crossfire - 2003-2007
Displacement: 3199 cc, Power: 165 kW (224 hp) at 5600 rpm, Torque: 315 Nm at 3000-4800 rpm
SL 320 R 129 1998-2001
E 320 W / S 210 1997-2002
E 320 W / S 211 2003-2006
S 320 W 220 1998-2002

M 112 E 32 ML 

 
Designation model series Construction
Displacement: 3199 cc, Power: 246 kW (335 hp) at 6100 rpm, Torque: 420 Nm at 3500 rpm
Chrysler Crossfire SRT-6 - 2004-2007
Displacement: 3199 cc, Power: 260 kW (354 hp) at 6100 rpm, Torque: 450 Nm at 4400 rpm
SLK 32 AMG R 170 2001-2004
C 32 AMG W / S 203 2000-2004

M 112 E 37

Designation model series Construction
Displacement: 3724 cc, Power: 170 kW (231 hp) at 5600 rpm, Torque: 345 Nm at 2500-4500 / min
Viano 3.5 / Vito 123 W / V 639 2004-2008
Capacity: 3724 cc, power: 173 kW (235 hp) at 5750 rpm, torque: 345 Nm at 3000-4500 rpm
ML 350 W 163 2003-2005
Capacity: 3724 cc, power: 180 kW (245 hp) at 5700 rpm, torque: 350 Nm at 3000-4500 rpm
ML 350 W 163 2002-2003
S 350 W / V 220 2002-2005
SL 350 R 230 2003-2006

Technical

  • Mercedes M 112 engine Technical details and specifications  (1997-2005) 

    Mercedes-Benz C-Class 2.4 C240  (1998-2001)

    No. of cylinders 6/OHC
    Capacity 2398cc
    Diagnostic socket Yes
    Firing order 1-4-3-6-2-5
    Compression ratio 10:1
    Suitable for unleaded petrol Yes
    Ignition Fuel system Make Bosch Motronic ME2.0
    Oil pressure 3.0 bar @ 3000 rpm
    Radiator cap 1.3-1.4ba
    Thermostat opens 87°C

    © Motor car History

     

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Service

  • Mercedes M 112 engine Service Guide (1997-2005) 

    Mercedes-Benz C-Class 2.4 C240  (1998-2001)

    Spark plugs Original equipment Bosch Type F8DPER
    Spark plugs Electrode gap 1.0-1.1 mm
    Spark plugs Tighten 28 Nm
    Spark plugs Make Bosch Type F8DPER
    Spark plugs Make Champion Type RC10PYP4
    Spark plugs Make NGK Type PFR5G-11
    Valve clearance -INLET Hydraulic
    Valve clearance -EXHAUST Hydraulic
    Engine oil grade - cold climate 5W/30 Semi-synthetic
    Engine oil grade - moderate climate 10W/40SAE Semi-synthetic or 10W/50SAE Semi-synthetic
    Engine oil grade - hot climate 20W/40SAE Semi-synthetic
    Engine oil with filter 8.0 litres
    Engine oil Sump drain bolt Tighten 30 Nm
    Manual gearbox oil grade 75W/80SAE Synthetic 1.5 litres
    Automatic transmission fluid Type ATF
    Differential oil grade rear 85W/90SAE Semi-synthetic 1.1 litres
    Cooling system 9.5 litres
    Brake fluid Type DOT 4+ 0.4-0.6 litres
    Power steering fluid Type ATF 1.0 litres

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