In cases where you are alert of abnormal symptoms on your vehicle, you are right to be concerned, because a car represents a massive annual budget and sudden breakdowns don’t reduce the costs. So what if you feel as if you have a leaking injector on your Mercedes Classe A 3? You almost certainly figured it out thanks to black/oily drips along your engine, or a disturbed idle, or abnormal black smoke. These three manifestations are the main signals of a leaking injector. As this failure can produce more significant engine trouble on your car, we thought we would publish this article content to help you validate the failure of a leaking injector and deal with it correctly. To accomplish this, we will first check out the circumstance of gasoline injectors and then at those of diesel injectors Mercedes Classe A 3.


Leaking injector on my petrol Mercedes Classe A 3

It is crucial to know that the injectors on petrol and diesel engines are different, actually, the difference in combustion between these two sort of engines makes the injection different. The biggest 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 A 3: The different leaks

It should be noted that injector leaks on a Mercedes Classe A 3 equipped with a petrol engine are pretty infrequent. This is as a result of the much lower pressure in the petrol intake systems. Even so, there are two sort 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 connected to the fuel rail, an O-ring will be involved in this.
  • Leak injector of the lower part:
    At last, you may experience 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 A 3

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 A 3: The different leaks

In the circumstance of leaking diesel injectors on your Mercedes Classe A 3, there are three several sort of leaks:

  • Leakage from the injector inlet:
    In this case, it is an inlet pipe that will deform with time, in most cases the leak will be at the clamping point.
  • Injector return leakage:
    As its name implies, this leakage concerns the management of the fuel return in the injector, this time the injector that leaks on your Mercedes Classe A 3 will be caused by 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 advise you to consult this article content on the presence of oil leaking on your Mercedes Classe A 3.

Leaking injector on my Mercedes Classe A 3, how to fix the leak

And to finish, we’re going to check out how to fix a leaking injector on your car. Frequently a leak is associated, as we have seen sooner, to a worn seal caused by the pressures endured. But think that the pressure in the circuit is enormous, 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.

Relating to the repair part of your leak, it will regularly be restricted to changing the seals that have failed:

  • Find out the source of the leak
  • Dismantle the injector in question
  • Replace the corresponding seal kit
  • Reassemble the assembly and tighten with a torque wrench in respect with the manufacturer’s standards.

In all cases, these interventions are not automatically complicated, but if you have the smallest doubt in the treatment of your injector that leaks on your Mercedes Classe A 3, we advise you to get closer to your auto technician to avoid any bad manipulation that could critically harm the condition of your Mercedes Classe A 3.

In the event that you have any further questions about the Mercedes Classe A 3, do not hesitate to consult our Mercedes Classe A 3 category.