In the event you are aware of irregular symptoms on your automobile, you are right to be worried, because a car represents a huge annual budget and unforeseen malfunctions don’t lower the bill. So what if you sense that you have a leaking injector on your Mercedes C class? You likely figured it out thanks to black/oily drips along your engine unit, or a disturbed idle, or unconventional black smoke. These three symptoms are the main signs of a leaking injector. As this problem can bring about more serious engine problems on your car, we decided to produce this content to help you ensure the failure of a leaking injector and deal with it properly. To do so, we will first of all take a look at the circumstance of gasoline injectors and then at those of diesel injectors Mercedes C class.

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Leaking injector on my petrol Mercedes C class

It is essential to know that the injectors on petrol and diesel engines are distinct, in fact, the difference in combustion between these two types of engines makes the injection distinct. 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 C class: The different leaks

It should be known that injector leaks on a Mercedes C class equipped with a petrol engine are pretty rare. This is as a result of 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 conceivable that you have a leak from the top of the injector, this is the part that is attached to the fuel rail, an O-ring will be involved in this.
  • Leak injector of the lower part:
    Finally, 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 sooner.

Leaking injector on my diesel Mercedes C class

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 C class: The different leaks

In the circumstance of leaking diesel injectors on your Mercedes C class, there are three several types of leaks:

  • Leakage from the injector inlet:
    In cases like this, it is an inlet pipe that will deform along with time, usually the leak will be at the clamping point.
  • Injector return leakage:
    As its name suggests, this leakage concerns the management of the fuel return in the injector, this time the injector that leaks on your Mercedes C 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 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 verifying you have oil leaking but it does not come from your injectors, we recommend you to consult this content on the presence of oil leaking on your Mercedes C class.

Leaking injector on my Mercedes C class, how to fix the leak

And to finish, we’re going to take a look at how to fix a leaking injector on your car. Frequently a leak is associated, as we have seen sooner, to a worn seal as a result of the pressures endured. But think that the pressure in the circuit is gigantic, especially on diesel engines. So you will have to take some precautions:

  • 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.

Regarding the repair part of your leak, it will frequently be limited to swapping the seals that have failed:

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

In all cases, these interventions are not inevitably difficult, but if you have the slightest uncertainty in the treatment of your injector that leaks on your Mercedes C class, we recommend you to get closer to your repair shop to avoid any bad handling that could seriously harm the condition of your Mercedes C class.

If you need more tutorials on the Mercedes C class, go to our Mercedes C class category.