Whenever you are alert of irregular signs on your vehicle, you are right to be preoccupied, because a car represents a huge annual budget and unexpected malfunctions don’t reduce the costs. So what if you think that you have a leaking injector on your Mercedes Classe C 4? You almost certainly figured it out thanks to black/oily drips along your engine unit, or a disturbed idle, or abnormal black smoke. These three symptoms are the main signs of a leaking injector. As this troubles can bring about more serious engine complications on your car, we chose to compose this content to help you validate the failure of a leaking injector and treat it correctly. To accomplish this, we will initially look at the case of gasoline injectors and then at those of diesel injectors Mercedes Classe C 4.
Leaking injector on my petrol Mercedes Classe C 4
It is essential to know that the injectors on petrol and diesel engines are different, in reality, the difference in combustion between these two types of engines makes the injection different. The essential difference lies in the pressure undergone 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 4: The different leaks
It should be mentioned that injector leaks on a Mercedes Classe C 4 equipped with a petrol engine are pretty rare. This is resulting from the much lower pressure in the petrol intake systems. However, there are two types of leaks:
- Leakage from the top of the injector:
It is conceivable 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:
At last, you may encounter a leak coming from the lower portion of the injector of your car, this one will come from the junction with the engine and not with the rail as seen previously.
Leaking injector on my diesel Mercedes Classe C 4
Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion system 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 4: The different leaks
In the case of leaking diesel injectors on your Mercedes Classe C 4, there are three several types of leaks:
- Leakage from the injector inlet:
In this case, it is an inlet pipe that will deform over time, commonly the leak will be at the clamping point. - Injector return leakage:
As its name indicates, this leakage concerns the management of the fuel return in the injector, this time the injector that leaks on your Mercedes Classe C 4 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 checking you have oil leaking but it does not come from your injectors, we recommend you to browse this content on the presence of oil leaking on your Mercedes Classe C 4.
Leaking injector on my Mercedes Classe C 4, how to fix the leak
And at last, we’re going to look at how to fix a leaking injector on your car. Frequently a leak is linked, as we have seen prior to this, to a worn seal due to the pressures suffered. But think that the pressure in the circuit is enormous, specifically on diesel engines. So you will have to take some precautions:
- Lower the pressure before any work is achieved…
- Masking you to avoid the risk of fuel spillage
- NEVER work on a running diesel engine injector.
Regarding the repair part of your leak, it will oftentimes be restricted to changing the seals that have failed:
- Discover the source of the leak
- Dismantle the injector in question
- Replace 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 necessarily complicated, but if you have the smallest doubt in the treatment of your injector that leaks on your Mercedes Classe C 4, we recommend you to get closer to your motor mechanic to avoid any bad manipulation that could critically harm the condition of your Mercedes Classe C 4.
In the event that you have any further questions about the Mercedes Classe C 4, do not hesitate to consult our Mercedes Classe C 4 category.
