Mercedes-Benz OM604 engine
The diesel four OM604 is the junior analogue of the series. Recall that in the same family there are five OM605 and six OM606. The engine came out in 1993 and was installed on the W202.
Engine description
The design scheme of the OM604 is practically no different from other engines of this diesel series. The cylinder block is cast iron, the heads are 24-valve, the injection pump is of a mechanical type. Such a motor is called a vortex chamber, since during the working stroke the air swirls strongly when passing through the preliminary chamber. This is where fuel injection takes place. Thus, the combustion of diesel fuel is carried out in a special type of chamber located in the cylinder head. The remaining gases rush into the cylinder, acting on the piston. These are the main indicators of the operation of this power unit.
Camshaft OM604 double, overhead DOHC type. This scheme replaced the old one with a SOHC type camshaft. Fuel injection is direct.
OM604 was produced in two working volumes:
- 1997 cm3 - this motor was produced in the period 1996-1998;
- 2155 cm3 - produced in the period 1993-1998.
Both versions were equipped with an injection system from Lucas - extremely unreliable and problematic. First of all, the seals of these mechanisms fail, which become brittle and leak over time. As for electric pumps from Bosch, they were installed on the latest versions of OM604 engines. Among the features of these motors I would like to highlight:
- noisy operation, which is explained by the simultaneous combustion of the entire portion of the fuel;
- lower consumption of diesel fuel, but also low power compared to gasoline counterparts.
We also note that the OM604 was the last junior pre-chamber engine in the history of Mercedes-Benz.
| Modification name | Volume and years of production | Power and torque | Bore and stroke |
|---|---|---|---|
| ABOUT 604.910 EVE | 2155 cu. cm/1993–1998 | 94 HP at 5000 rpm; 150 Nm at 3100 rpm | 89.0 x 86.6 mm |
| ABOUT 604.910 EVE | 2155 cu. cm/1996–1998 | 74 HP at 5000 rpm; 150 Nm at 3100 rpm | 89.0 x 86.6 mm |
| ABOUT 604.912 EVE | 2155 cu. cm/1995–1998 | 94 HP at 5000 rpm; 150 Nm at 3100 rpm | 89.0 x 86.6 mm |
| ABOUT 604.912 EVE | 2155 cu. cm/1996–1998 | 74 HP at 5000 rpm; 150 Nm at 3100 rpm | 89.0 x 86.6 mm |
| ABOUT 604.915 EVE | 1997 cc cm/1996–1998 | 87 HP at 5000 rpm; 135 Nm at 2000 rpm | 87.0 x 84.0 mm |
| ABOUT 604.917 EVE | 1997 cc cm/1996–1998 | 87 HP at 5000 rpm; 135 Nm at 2000 rpm | 87.0 x 84.0 mm |
| Winemaking | Mercedes-Benz |
| Years of issue | 1993-1998 |
| Configuration | Inline, 4-cylinder |
| Volume in liters | 2.0; 2.2 |
| Volume in cube. cm | 1997 and 2155 |
| Maximum power, hp | 88 and 75 - 95 |
| Maximum torque, N * m (kg * m) at rpm. | 135 (14) / 2000; 135 (14) / 4650 and 150 (15) / 3100; 150 (15) / 4500 |
| Timing (gas distribution mechanism) | chain |
| Valve diagram | 16-valve DOHC |
| Compression ratio | 22 to 1 |
| Supercharger | no |
| Охлаждение | liquid |
| Fuel system | Direct injection |
| Predecessor | OM601 |
| Successor | OM611 |
| Cylinder diameter (mm) | 87.00 and 89.00 |
| Piston stroke (mm) | 84 and 86.60 |
| Fuel consumption, l / 100 km | 7.7 - 8.2 and 7.4 - 8.4 |
| Cars in which it was installed | C-Class: restyling 1997, sedan, 1st generation, W202 (03.1997 – 02.2000); sedan, 1st generation, W202 (03.1993 – 02.1997); station wagon, 1st generation, S202 (03.1997 – 02.2001) E-Class 1995, sedan, 2nd generation, W210 (05.1995 – 07.1999) |
Advantages and disadvantages
Problem injection pump
Consider the main characteristics of this unit, which are considered to be its advantage.
- Reliability. Indeed, the motor is cast from cast iron, its piston does not experience excessive loads, easily withstanding a 600th run. With timely maintenance, the motor worked without capital and up to 1 million km.
- Lack of electronics. In fact, it is, but in very small quantities. Masses of buggy sensors and computers are not here.
- Omnivorous. Designed according to the designs of the 90s, this power unit accepts almost any diesel fuel.
- Profitability. Compared to gasoline counterparts, OM604 consumes much less.
- Endurance. Even with a lot of minor problems, this engine continues to work - of course, the complete destruction of components and parts does not count.
And now the cons.
- Fear of overheating. As with all analogues of the family, the weak point of the OM604 is the cylinder head, which tends to crack and burst.
- Sensitivity to moisture injector. The injection system does not tolerate fuels containing water.
- The complexity of the repair. The injection system is extremely difficult to restore.
| Alien Visitor | what are the global problems (except for the Lucas injection pump) of this motor, given that it is dripping from the pump somewhere, and what kind of pump is in fact not yet known. I believe that Zavadsky slag., The owner is actively stupid on all questions about the equipment, he didn’t know any problems and, for 3 years he ran 15 thousand without gimor. Actually, the price captivates, and the well-being (extremely decent for 97g) of the proposed acquisition of body elements in general. has not yet begun to rot))) has not yet begun to rot))) Based on this, there is no desire fuel, because to feed the prospector with a diesel salary. Simply put, will om604 survive on a diesel locomotive? By the way, if he hawali without any problems))) |
| Mersovod | A chic engine is one misfortune of a high-pressure fuel pump. But not everything is so bad, it turns out that there are practical developments of clubmates on the transfer of om-604 to an in-line injection pump from the 601st. Myself, I could have slammed a turbine from 601,2,3 and an injection pump from it, and an intercooler in addition, according to my hypothetical ideas, 150 forces can be removed without damage to the engine life ... |
| Dace | I had such a Mercedes with such an engine, he didn’t see a salary from a gas station at all, he ate everything in a row, the only thing that broke on it was the rotor position sensor and the advance rod, went to Minsk and did everything, drove another 100 thousand on it and sold it to a taxi driver in his city, he still rides on it and enjoys it. |
| Andrey48 | and from personal experience: he eats well on a good salar better than 601 and 602 atmospheres. |
| Alien Visitor | i.e., the main gimor 604 is a fuel injection pump (?) all the same |
| Andrey48 | look in emergency mode or not, there is an EPC light on the tidy if it is on, it means that there are some problems with the fuel, scan the old one and look on the internet what the error means. if the injection pump is normally made, then the next thousand 250 km, I think you should not bother |
| Roma | there are no special secrets there is an ordinary 16-valve diesel engine, the main thing is that there are no errors on the fuel line, you will take it for cheap, if troubles start with the injection pump, I will give you the contacts of the person who did it for me in Minsk, it will not suit you for the price, you will put it with 601 injection pump, wind it up and you will be happiness |
| Harden | Dviglo 604 is reliable like 601, but replace the high-pressure fuel pump with an in-line one from VITO 2.3 and there will be happiness for many years. |
| Spy | What is the conclusion: take 605.911 and you will be happy without hemorrhoids |
| Smog | There are enough hemorrhoids. |
| Spy | For example? I see hemorrhoids in 604 - this is only the Lucas injection pump, in 605.911 a simple, reliable, brainless, in-line Bosch injection pump. Everything else is the same as in 604. |
| Ramirez | The motor itself can and will turn out “on the knee”, but if without Lucas. I use 601 and 604 and I think if you put the pump on 604 from 601, you will get a very reliable, economical and unpretentious motor, and it will eat everything. But here's a real review about the dynamics and other things, after installing an in-line high-pressure fuel pump on om604, I did not find it. And 604 compared to 601 is quieter, softer, more powerful, generally more modern. On both, I drive a solarium with KAMAZ merged. |
| Dizia | Yesterday it was useful to change the valve cover gasket, because. oil was leaking. I thought that it was about her ... But no! He took off the top plastic cover, and there is oil in the nozzle wells! At what in all! Where does it come from and how can this disease be cured? There were no symptoms before! The smoke from the exhaust is not black or white, but normal exhaust. The engine runs smoothly and for the last 4-5 diagnostics, not a single master has said about this problem! |
| Oleg Cook | smacks from under the sealing rings of the nozzles. remove, treat surfaces, change rings, bolts - check the nozzles, clean the wells from resin |
| Dizia | Oleg, as I understand it, the sealing rings under the injectors? What about bolts? Check the injectors, they seem to be delivering good fuel. The engine does not troit, runs smoothly. How about changing the valve cover gasket? Could it be oil leaking from the breather? the tube that goes into it is not fixed at all. It's just not inserted tightly and there are not even hamutiks. Just in case, I installed it yesterday. |
| Sergey212 | valve cover gasket replacement A 604 016 02 21-injector well sealing ring 4 pcs A 606 016 02 21 -valve cover gasket 1 pcs Don't touch the injectors, you don't have CDI |
