If you are aware of irregular signs on your vehicle, you are right to be intrigued, because a car represents a huge annual budget and surprising breakdowns don’t lower the expenses. So what if you think that you have a leaking injector on your Mercedes Classe C? You probably figured it out thanks to black/oily drips along your engine, or a troubled idle, or strange black smoke. These three signs of illness are the main signals of a leaking injector. As this failure can end up in more critical engine concerns on your car, we chose to publish this content page to help you verify the failure of a leaking injector and treat it properly. To accomplish this, we will initially look at the circumstance of gasoline injectors and then at those of diesel injectors Mercedes Classe C.
Leaking injector on my petrol Mercedes Classe C
It is vital to know that the injectors on petrol and diesel engines are different, the reality is, the difference in combustion between these two types of engines makes the injection different. The key difference lies in the pressure experienced by the injectors, on a petrol engine it will vary between 3.5 bars for indirect injection and 120 bars for indirect injection.
Leaking injector on a petrol Mercedes Classe C: The different leaks
It should be noted that injector leaks on a Mercedes Classe C equipped with a petrol engine are pretty rare. This is resulting from the much lower pressure in the petrol intake systems. Nevertheless, there are two types of leaks:
- Leakage from the top of the injector:
It is possible that you have a leak from the top of the injector, this is the part that is linked to the fuel rail, an O-ring will be involved in this. - Leak injector of the lower part:
Finally, you may suffer a leak coming from the lower part of the injector of your car, this one will appear from the junction with the engine and not with the rail as seen previously.
Leaking injector on my diesel Mercedes Classe C
Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion procedure creates very high pressure in the engine, as do the injectors. On these models, the pressure is more than 10 times higher than on the direct injection of car petrol engines, reaching 1800 to 2000 bars.
Leaking injector on diesel Mercedes Classe C: The different leaks
In the circumstance of leaking diesel injectors on your Mercedes Classe C, there are three different types of leaks:
- Leakage from the injector inlet:
In cases like this, it is an inlet pipe that will deform after a while, in most cases the leak will be at the clamping point. - Injector return leakage:
As its name indicates, this leakage relates to the management of the fuel return in the injector, this time the injector that leaks on your Mercedes Classe C will be a consequence of an O-ring or its plastic tip that leaks. - Injector base leak:
This injection leak is one of the most annoying, it is the junction between the engine and the injector nose that leaks at a copper seal, you should find an air noise and a compression loss. - If after examining you have oil leaking but it does not come from your injectors, we recommend you to read this content page on the existence of oil leaking on your Mercedes Classe C.
Leaking injector on my Mercedes Classe C, how to fix the leak
And to finish, we’re going to look at how to fix a leaking injector on your car. Very often a leak is associated, as we have seen previously, to a worn seal as a result of the pressures endured. But think that the pressure in the circuit is tremendous, especially on diesel engines. So you will have to take some safety measures:
- Lower the pressure before any work is conducted…
- Covering you to avoid the risk of fuel spillage
- NEVER work on a running diesel engine injector.
Concerning the repair part of your leak, it will oftentimes be limited to swapping the seals that have failed:
- Discover the source of the leak
- Take apart the injector in question
- Change the corresponding seal kit
- Reassemble the set up and tighten with a torque wrench in respect with the manufacturer’s standards.
In all situations, these interventions are not automatically very hard, but if you have the slightest hesitation in the treatment of your injector that leaks on your Mercedes Classe C, we recommend you to get closer to your mechanic to avoid any bad manipulation that could critically harm the condition of your Mercedes Classe C.
If you need more tutorials on the Mercedes Classe C, go to our Mercedes Classe C category.
