Leaking injector on my Mercedes Benz M Class, what to do ?

In the event you are aware of irregular symptoms on your car, you are right to be intrigued, because a car represents a huge annual budget and unexpected malfunctions don’t reduce the bill. So what if you feel like you have a leaking injector on your Mercedes Benz M Class? You most 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 indicators of a leaking injector. As this failure can bring on more serious engine trouble on your car, we chose to write this content page to help you ensure the failure of a leaking injector and handle it properly. To do this, we will first take a look at the case of gasoline injectors and then at those of diesel injectors Mercedes Benz M Class.

Leaking injector on my petrol Mercedes Benz M Class

It is vital to know that the injectors on petrol and diesel engines are different, actually, the difference in combustion between these two kind of engines makes the injection different. The main 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 Benz M Class: The different leaks

It should be noted that injector leaks on a Mercedes Benz M Class equipped with a petrol engine are pretty infrequent. This is because of the much lower pressure in the petrol intake systems. However, there are two kind 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:
    Finally, you may encounter a leak coming from the lower part 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 Benz M Class

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 Benz M Class: The different leaks

In the case of leaking diesel injectors on your Mercedes Benz M Class, there are three several kind of leaks:

  • Leakage from the injector inlet:
    In this instance, it is an inlet pipe that will deform as time passes, usually the leak will be at the clamping point.
  • Injector return leakage:
    As its name reveals, this leakage relates to the management of the fuel return in the injector, this time the injector that leaks on your Mercedes Benz M Class will be caused by an O-ring or its plastic tip that leaks.
  • Injector base leak:
    This injection leak is one of the most bothersome, 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 encourage you to consult this content page on the existence of oil leaking on your Mercedes Benz M Class.

Leaking injector on my Mercedes Benz M Class, how to fix the leak

And at last, we’re going to take a look at how to fix a leaking injector on your car. Oftentimes a leak is connected, as we have seen prior to this, to a worn seal because of the pressures endured. But think that the pressure in the circuit is tremendous, specifically on diesel engines. So you will have to take some measures:

  • Lower the pressure before any work is carried out…
  • Masking 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 limited to changing the seals that have failed:

  • Find the source of the leak
  • Take apart the injector in question
  • Change 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 specifically difficult, but if you have the tiniest doubt in the treatment of your injector that leaks on your Mercedes Benz M Class, we encourage you to get closer to your repair shop to avoid any bad manipulation that could significantly harm the condition of your Mercedes Benz M Class.

If you need more guides on the Mercedes Benz M Class, go to our Mercedes Benz M Class category.

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