The Mercedes-Benz 112 engine is a six-cylinder engine with volumes of 2.4, 2.8, 3.2, 3.5 liters and a camber angle of 90 degrees. It is reliable and capable of withstanding heavy loads.
Car and body models where the motor is installed
ICE 112 is installed on almost all models of rear-wheel drive cars from C- to S-class: C240, C320, E240, E320, ML320, ML350, SLK350, S320. Among these cars, the most common body types are: sedan, two-door convertible, off-road.
Resource Mercedes М112
The internal combustion engine resource is no more than 300 thousand km. With such a mileage, it is imperative to undergo maintenance every six months - a year, but a major overhaul of the motor is not required.
M112 engine problems, signs of malfunction
Most often, the following malfunctions appear:
- vibration of the motor (with high wear of the balancing shaft);
- loss of internal combustion engine power;
- wear of the piston group;
- increased oil consumption for waste (normal consumption is 1 liter per 1000 km);
- poor idling;
- oil leakage from under the covers;
- oil starvation.
Such problems are found on cars with a mileage of more than 200 thousand km. But replacing the timing chain will help get rid of unpleasant sounds, noises, vibration and uneven work. It is also recommended not to clean the crankcase gas outlets too often: this is the reason for the appearance of oil starvation, loss of power and other signs.
This spectacular Mercedes was never put into production; But why did it happen, because by the time the Ts112 was presented in Frankfurt, in 91st, 700 orders had already been received for this car.
There are at least 3 reasons here. 
First let's say;—
that this is not such a fast car (about the technical characteristics below); but right away I want to say that the buyer of such an expensive car will be very happy when Diablo bypasses him on the highway (not super - an exclusive supercar, in the USA in the early 90s).
A little about appearanceMercedes C112
Now take a look at the photo of the Mercedes C112,—
Don't you think this car looks like a supercar, 
just next to the 124th, or? But next to the one that appeared in the 95th -210-
oh,—
this is an old car (from a certain angle). Perhaps this also played a role in the non-release of the 112th in the series.
There are "seagull wings” but there is no history in this car; and some sources speak of its dampness. Which owner would like a supercar that breaks often?
- A couple of letters about the salon:
The salon also hints that the 112th, 
—
this is not a super extreme car; but very fast, and at the same time - comfortable, Gran Turismo. There is a large - four-spoke steering wheel, which is not very appropriate for a supercar;—
You certainly wouldn't see a steering wheel similar to a Ferrari, or a Lambo.
SpecificationsMercedes C112
The Mercedes Ts112 engine was borrowed from128-
WowSL.This is a six-literV12,
at 408hp power and with a torque of 580NM, which by the way is already achieved at 3,800rpm. Here with this motor, with a six-speed manual gearbox, and a main pair with a ratio of 2.93:1;
this SuperMercedes is capable of accelerating up to 100km in 4.9s (and you must admit, for a 91st, this is hardly a good indicator, for a supercar).
Maximum speed - 312 km per hour. In this,— not enough speed is a very weighty weighty reason why the car could not go into series. After all, even without very significant interventions in the engine; the same - six-literR129, could already be significantly faster than the monitored Mercedes. And it will cost several times less.
- Outcomes:
This is a beautiful, very technological, but crude, and not fast enough car. Even if those 700 cars were made and sold, the solutions that have not yet been worked out could significantly damage the image of the Stuttgart company. But later, the technologies introduced in the 112th were used on new, top-end models of the brand.
Engine Mercedes-Benz M112 E32 3.2 l.
M112 engine characteristics
| Production | Stuttgart-Bad Cannstatt Plant |
| Engine brand | M112 |
| Years of release | 1997-present |
| Cylinder block material | aluminum |
| Supply system | injector |
| Type of | V-shaped |
| Number of cylinders | 6 |
| Valves per cylinder | 3 |
| Piston stroke, mm | 84 |
| Cylinder diameter, mm | 89.9 |
| Compression ratio | 10 |
| Engine displacement, cubic cm | 3199 |
| Engine power, hp / rpm | 190/5600 218/5700 224/5600 (see modifications) |
| Torque, Nm / rpm | 270/2750 310/3000 315/3000 (see modifications) |
| Fuel | 95 |
| Environmental standards | Euro 4 |
| Engine weight, kg | ~150 |
| Fuel consumption, l / 100 km (for E320 W211) - town - track - mixed. |
14.4 7.5 9.9 |
| Oil consumption, gr. / 1000 km | up to 800 |
| Engine oil | 0W-30 0W-40 5W-30 5W-40 5W-50 10W-40 10W-50 15W-40 15W-50 |
| How much oil is in the engine, l | 8.0 |
| When replacing pouring, l | ~7.5 |
| Oil change is being carried out, km | 7000-10000 |
| Engine operating temperature, deg. | ~90 |
| Engine resource, thousand km - according to the plant - on practice |
- 300+ |
| Tuning, h.p. - potential - without loss of resource |
500+ - |
| The engine was installed | Mercedes-Benz C 320 W203 Mercedes-Benz CLK 320 C208 Mercedes-Benz CLK 320 C209 Mercedes-Benz E 320 W210 Mercedes-Benz E 320 W211 Mercedes-Benz ML 320 W163 Mercedes-Benz S 320 W220 Mercedes-Benz SL 320 R129 Mercedes-Benz SLK 320 R170 Mercedes-Benz Viano 3.0 / Vito 119 W639 Mercedes-Benz Viano 3.2 / Vito 122 W639 Chrysler crossfire |
Engine reliability, problems and repair Mercedes М112 Е32 3.2 l.
Another version of the six-cylinder engine from Mercedes, with a displacement of 3.2 liters, released in 1997 and replacing the inline M104 E32. The new 112th family was formed from a number of different engines: M112 E24, M112 E26, M112 E28, M112 E32 ML and M112 E37. Unlike its predecessor, in the M112 it was decided to move away from the inline-type engine and build new sixes in a V-shaped version with a camber angle of 90 °, which made it possible to increase the compactness of the power plant and unify the V6 and V8 M113 as much as possible, and to balance the moment from the forces of the second order, the balancer shaft has been added. At the same time, when choosing a material for the manufacture of a cylinder block, it was decided to abandon heavy cast iron and opt for light aluminum, this step had a very positive effect on the total weight of the engine.
Cylinder heads are aluminum, single-shaft (SOHC) with three valves per cylinder: two inlet, one outlet. The diameter of the intake valves is 36 mm, the exhaust valves are 41 mm. The M112 uses a variable valve timing system, hydraulic lifters, and a variable-length intake manifold.The timing system uses a chain with an average service life of about 200 thousand km. Bosch Motronic ME 2.0 control system.
The engine was intended for Mercedes models with an index of 320.
In parallel with the six-cylinder M112 E32, a V8 unified with it, called the M113 E43, was also produced.
The next step in the development of the V6 from Mercedes-Benz was the M 272 KE / DE 35, introduced in 2004 and smoothly replacing the 112 series.
Modifications of engines М 112 Е 32
1.M112.940 (1997 - 2003 onwards) - 218 hp version. at 5700 rpm, torque 310 Nm at 3000 rpm. Installed on Mercedes-Benz CLK 320 C208.
2. M112.941 (1997 - 2002 onwards) - analogue for Mercedes-Benz E 320 W210. Engine power 224 HP at 5600 rpm, torque 315 Nm at 3000 rpm.
3.M112.942 (1997 - 2005 onwards) - analogue of M 112.940 for Mercedes-Benz ML 320 W163.
4.M112.943 (1998 - 2001) - analogue of M 112.941 for Mercedes-Benz SL 320 R129.
5.M112.944 (1998 - 2002 onwards) - analogue of M 112.941 for Mercedes-Benz S 320 W220.
6.M112.946 (2000 - 2005) - analogue of M 112.940 for Mercedes-Benz C 320 W203.
7.M112.947 (2000 - 2004 onwards) - analogue of M 112.940 for Mercedes-Benz SLK 320 R170.
8.M112.949 (2003 - 2006 onwards) - analogue of M 112.941 for Mercedes-Benz E 320 W211.
9.M112.951 (2003 - present) - version for Mercedes-Benz Vito 119 / Viano 3.0 W639, power 190 hp. at 5600 rpm, torque 270 Nm at 2750 rpm.
10.M112.953 (2000 - 2005) - analogue of M 112.940 for Mercedes-Benz C 320 4Matic W203.
11.M112.954 (2003 - 2006 onwards) - analogue of M 112.941 for Mercedes-Benz E 320 4Matic W211.
12.M112.955 (2002 - 2005) - analogue of M 112.940 for Mercedes-Benz Vito 122 / Viano 3.0 W639, CLK 320 C209.
Problems and malfunctions of engines Mercedes M112 3.2 l.
1. High oil consumption. The cause of a serious oil burn is often the wear of the valve stem seals and the issue of replacing them is being resolved. The second option is crankcase ventilation contaminated with carbon deposits, in which case cleaning is necessary.
2. Oil leaks. The weak point in terms of M112 leaks is the seal of the oil heat exchanger, replacing the gasket will help.
In addition, after ~ 80 thousand km, the crankshaft pulley damper, crankshaft sensor tend to exfoliate, injectors die from low-quality gasoline after ~ 70-80 thousand km, which leads to a loss of power and problems with the operation of the engine. In general, with a normal approach (regular maintenance, high-quality gasoline and oil), the M112 engine is quite reliable, has a service life of about 300+ thousand km and you should not expect any serious troubles from it.
Mercedes M112 engine tuning
Chip tuning. Compressor
The M112 engine has an excellent groundwork for increasing power and for these purposes the market provides a wide selection of tuning accessories. The easiest and least difficult step along this path can be the atmospheric option. We need Schrick 256/268 sports camshafts (or others), cold intake, catalystless exhaust, or fully sporty and appropriate firmware. The output will be about 250 hp.
A more powerful city engine can be built by installing a mechanical supercharger. There are ready-made compressor kits (from Kleemann for example) that do not require replacing the piston, a standard motor will withstand pressure up to 0.5 bar. Together with E32 ML AMG injectors, fuel pump, 3 ″ exhaust, the output will reach ~ 340 hp. and the engine is much closer to the M112 E32 ML AMG, but the cost of pleasure is quite high. For even more power, you need to change the piston, reduce the compression ratio, port the cylinder head and safely blow far beyond 0.5 bar.
I cannot call this Mercedes C112 special in the history of the Stuttgart Company. The fact is that it does not bring significant - sports victories; and there is no history in it, as for example in, or in the stately.
itMercedes C112, and its essence is different;— this is the development of various technological solutions; for their introduction into mass Mercedes models. So - that, the emphasis here is not even in speed, but in manufacturability.
This car was made by Mercedes specialists, together with masters fromSauber;and they showed their brainchild in 91st, in Frankfurt. It is noteworthy that already then, 700 orders were received for a new, German supercar; but why - then, he never went into the series?
There may be several reasons for this;—
firstly, this is not such a fast car 
(about the technical characteristics below). Secondly; - take a closer look, yes - this is a supercar, but look at these - straight lines, they give out thatC112,
—
this is a car from the era, and(and after all, after 4 years, came outMercedes)... The third reason lies in the dampness of this project; 
—
Well, who of the rich would like that their expensive Mercedes is constantly breaking down? And the words that those 700 orders would not have brought profit to Mercedes do not seem entirely believable. If the car was really ready, with so many orders, most likely, it would be put into series.
How do youMercedes C112externally
Take a look at the photo of Mercedes C112,—
pay attention to the doors, such as "gull wing". From their mere presence, we can conclude that 
that the Stuttgars were preparing a special role for the Ts112th. Let's remember that this is the 91st year; and even then, the system of active aerodynamics was applied here, where the rear wing could rise a significant, vertical angle, and at the same time work as an aerodynamic brake.
According to the passport data, the curb weight of the Mercedes C112 is 1550kg; and agree— this is not so much, for a car with a 6-literV12in the database.
Here, rear-wheel drive, and therefore, - the rear wheels, here are much wider than the front;— 335mm, against - 235 - front.
- A couple of Letters about the Salon:
If you look at the photo of the salon 112; 
you will notice the four-spoke steering wheel. Which looks much more appropriate on a comfortable sedan, and not on a supercar capable of overcoming the line of 300 km per hour. The steering wheel is not very sharp here;—
3.3 turns from one extreme point to another. That again - the same, suggests the idea of - "not extreme", this car.
SpecificationsMercedes C112
In the base Mercedes Ts112, installedV12,for 6.0l. This engine was borrowed fromR129- . 
With a power of 408hp, and a thrust of 580N.M at 3800N.M; equipped with a 6-speed manual gearbox, and a long main pair with a ratio in;— 2.
93;
1;
such a car could accelerate up to 100 km in 4.9 s; maximum speed - 312 km per hour.
Yes,— these are good, supercar performance; only with such acceleration, and with maximum speed, in the very beginning of the 90s, it was no longer surprising to a person looking closely at a Ferrari, or Lambo. And this is - to put it mildly.
Like the M104 engine, the M112 could be installed on all model lines of rear-wheel drive Mercedes - from C- to S-class. The engine is very compact and lightweight. This was mainly achieved through the use of cylinder heads with one camshaft and three valves per cylinder (two intake and one exhaust valves).
The motor was produced in four volumes - M112 E26 for types C240 and E240 with a volume of 2597 cc; M112 E28 for types C280 and E280 with a volume of 2799 cc; M112 E32 for most other types; M112 E37 for most types (they bore the designation “350” - for example, ML350), with a working volume of 3724 cc.
Motor production was established at the BadCannstatt plant, which opened on April 8, 1997, two weeks before the start of the Tuscaloosa, Alabama, USA plant, where production of the 163.154 ML320 began.
The M112 E32ML engine stands apart, which was installed for a short time on types C 32 AMG (type 203) and SLK 32 AMG (type 170). The motor turned out to be very "lively", and many connoisseurs argue that it is much more effective than, for example, the M113 in the same C55 AMG, which appeared later.
The designers managed to create a flexible layout scheme: in cars with a low hood, the air filter was placed on the right wing, and a pipe with an air flow sensor connected it to the throttle valve. In cars where the space above the engine allowed, the air filter was “pushed” directly onto the engine, in which case the flow meter was mounted directly to the throttle valve.
The engine number is stamped behind the right head of the block on the flywheel housing bump. The number is punched with dots (more precisely, with 5-ray "asterisks")
Typical defects for M112 engines
Destruction of the crankshaft pulley damper
Despite the simplicity of its design, the engine caused a lot of problems for owners and repairmen. There were many defects. We will touch upon them separately. One of the defects is the destruction of the crankshaft pulley (in the photo on the left - the initial stage of destruction, when the rubber "layer" between the two halves of the pulley begins to crawl out and collapse). In the extreme stage, the pulley falls apart and begins to cut the front cover, and sometimes even reaches the pallet.
Crankcase ventilation system problems on M112 and M113 motors
The problem affects one way or another all owners of Mercedes with M112 and M113 engines. This is usually expressed in two points: oiling along the junction of valve covers with covers of ventilation chambers of crankcase gases and, most importantly, in increased oil consumption.
By the way, about the expense. If the oil consumption on your Mercedes with M112 and M113 engines does not exceed 1 liter per 1000 km, then theoretically you can not be upset - this is the permissible oil consumption. If this bothers you, or if the consumption exceeds the specified liter per thousand, there is a reason to look for the reasons. But decide for yourself: in 75% of cases, the cost of solving this problem is much higher than the cost of oil, which you can spend on refills for several years.
So, oil consumption can be due to three reasons:
- external leaks (on M112 and M113 engines, this, as a rule, is a leak in the oil filter / heat exchanger housing, a leak in valve covers, an oil filler neck, rarely - crankshaft oil seals, even less often - an engine sump). This type of malfunction is subject to mandatory elimination;
- waste oil due to wear of the cylinder-piston group or aging of the valve stem seals. For an accurate diagnosis in this situation, an examination of the cylinders with a flexible endoscope is required - you can also see scuffing on the cylinder walls and oil / carbon deposits on the valve stems. Seizures on the walls of these motors are most often caused by the ingress of catalyst particles when the latter is destroyed from the use of low-quality fuel or savings on spark plugs. The exhaust gas passage is so blocked by a damaged catalyst that sometimes, after opening the exhaust valve, part of the gases, due to resonant movements, can get back into the cylinder, carrying small catalyst crumbs (ceramics, which simply gobbles up the cylinder walls);
- oil losses through the crankcase ventilation system. This happens, as a rule, due to the use of low-quality oil, long service intervals (it is better to change the oil every 10,000 km), frequent overheating, or vice versa - a large number of cold starts at very low temperatures.
In the latter case, it is necessary to remove the ventilation chamber covers on the left and right valve covers. The work is very ordinary and requires only accuracy and not the largest set of tools. After removing the covers of the ventilation chambers, it is necessary to clean the calibrated holes (clearly visible on the inserts in the two photos below).
You can use a drill with a diameter of 1.5 mm (if you dig into a larger diameter, you can run into an even greater oil consumption) to clean them. Also clean the oil drain holes in the valve covers (circled in yellow in the bottom photo). Do not forget to replace all ventilation hoses - after 30,000 they are just wooden. There are not many hoses, and they do not cost heroin at all.
It is never harmful to do the work for your engine, but do not assume that this is a panacea - if the system was really clogged, then the oil loss through it was 200 - 400 grams per 1000 km. Accordingly, the consumption will decrease approximately so much. If we were talking about a liter per thousand, there are probably several problems.
