If you are alert of irregular symptoms on your automobile, you are right to be intrigued, because a car represents a big annual budget and surprising breakdowns don’t lower the expenses. So what if you sense that you have a leaking injector on your Mercedes Cla? You probably figured it out thanks to black/oily drips along your engine unit, or a troubled idle, or strange black smoke. These three manifestations are the main signs of a leaking injector. As this troubles can lead to more serious engine complications on your car, we thought we would publish this content page to help you confirm the failure of a leaking injector and treat it correctly. To do so, we will first look into the case of gasoline injectors and then at those of diesel injectors Mercedes Cla.

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Leaking injector on my petrol Mercedes Cla

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 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 Cla: The different leaks

It should be noted that injector leaks on a Mercedes Cla equipped with a petrol engine are rather rare. This is because of 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 possible 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 occur from the junction with the engine and not with the rail as seen before.

Leaking injector on my diesel Mercedes Cla

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 Cla: The different leaks

In the case of leaking diesel injectors on your Mercedes Cla, there are three different kind of leaks:

  • Leakage from the injector inlet:
    In this instance, it is an inlet pipe that will deform along with time, in most cases 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 Cla 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 troublesome, 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 verifying you have oil leaking but it does not come from your injectors, we advise you to consult this content page on the presence of oil leaking on your Mercedes Cla.

Leaking injector on my Mercedes Cla, how to fix the leak

And finally, we’re going to look into how to fix a leaking injector on your car. Very often a leak is associated, as we have seen previously, to a worn seal because of the pressures suffered. But think that the pressure in the circuit is monumental, specifically on diesel engines. So you will have to take some precautions:

  • Lower the pressure before any work is done…
  • Covering you to avoid the risk of fuel spillage
  • NEVER work on a running diesel engine injector.

Concerning the repair part of your leak, it will very often be restricted to changing the seals that have failed:

  • Identify 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 accordance with the manufacturer’s standards.

In all cases, these interventions are not inevitably very hard, but if you have the smallest hesitation in the treatment of your injector that leaks on your Mercedes Cla, we advise you to get closer to your motor mechanic to avoid any bad handling that could critically harm the condition of your Mercedes Cla.

To get more tips on the Mercedes Cla, take a look at the Mercedes Cla category.