In the event you are alert of abnormal symptoms on your automobile, you are right to be worried, because a car represents a massive annual budget and sudden malfunctions don’t lower the expenses. So what if you feel as if you have a leaking injector on your Mercedes Classe Cls? You likely figured it out thanks to black/oily drips along your engine motor, or a troubled idle, or uncommon black smoke. These three signs of illness are the main signals of a leaking injector. As this problem can bring on more critical engine trouble on your car, we thought we would write this article content to help you confirm the failure of a leaking injector and handle it correctly. To achieve this, we will first of all look into the circumstance of gasoline injectors and then at those of diesel injectors Mercedes Classe Cls.

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Leaking injector on my petrol Mercedes Classe Cls

It is vital to know that the injectors on petrol and diesel engines are distinct, the truth is, the difference in combustion between these two kind of engines makes the injection distinct. 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 Cls: The different leaks

It should be mentioned that injector leaks on a Mercedes Classe Cls equipped with a petrol engine are pretty rare. This is caused by the much lower pressure in the petrol intake systems. Even so, there are two kind of leaks:

  • Leakage from the top of the injector:
    It is plausible 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 experience 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 Cls

Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion system generates 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 Cls: The different leaks

In the circumstance of leaking diesel injectors on your Mercedes Classe Cls, there are three different kind 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 reveals, this leakage concerns the management of the fuel return in the injector, this time the injector that leaks on your Mercedes Classe Cls will be brought on 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 feel an air noise and a compression loss.
  • If after checking you have oil leaking but it does not come from your injectors, we advise you to read this article content on the presence of oil leaking on your Mercedes Classe Cls.

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

And at last, we’re going to look into how to fix a leaking injector on your car. Very often a leak is linked, as we have seen sooner, to a worn seal because of the pressures suffered. 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 achieved…
  • 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 very often be limited to changing the seals that have failed:

  • Find the source of the leak
  • Take apart 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 cases, these interventions are not necessarily very hard, but if you have the tiniest hesitation in the treatment of your injector that leaks on your Mercedes Classe Cls, we advise you to get closer to your motor mechanic to avoid any bad handling that could seriously harm the condition of your Mercedes Classe Cls.

If you wish more guides on the Mercedes Classe Cls, go to our Mercedes Classe Cls category.