If you are informed of irregular symptoms on your automobile, you are right to be preoccupied, because a car represents a huge annual budget and unpredicted breakdowns don’t lower the expenses. So what if you feel like you have a leaking injector on your BMW 7 Series? You most likely figured it out thanks to black/oily drips along your engine, or a disturbed idle, or uncommon 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 produce this content page to help you ensure the failure of a leaking injector and treat it correctly. To do this, we will first look at the circumstance of gasoline injectors and then at those of diesel injectors BMW 7 Series.

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Leaking injector on my petrol BMW 7 Series

It is fundamental to know that the injectors on petrol and diesel engines are distinct, the reality is, the difference in combustion between these two sort of engines makes the injection distinct. The biggest 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 BMW 7 Series: The different leaks

It should be known that injector leaks on a BMW 7 Series equipped with a petrol engine are rather infrequent. This is due to 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 component that is attached 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 sooner.

Leaking injector on my diesel BMW 7 Series

Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion procedure 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 BMW 7 Series: The different leaks

In the circumstance of leaking diesel injectors on your BMW 7 Series, there are three different sort of leaks:

  • Leakage from the injector inlet:
    In this instance, it is an inlet pipe that will deform in the long run, 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 BMW 7 Series will be caused by 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 experience an air noise and a compression loss.
  • If after examining you have oil leaking but it does not come from your injectors, we suggest you to read this content page on the existence of oil leaking on your BMW 7 Series.

Leaking injector on my BMW 7 Series, how to fix the leak

And to finish, we’re going to look at 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 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…
  • Masking 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 regularly be limited to replacing the seals that have failed:

  • Identify the source of the leak
  • Take apart the injector in question
  • Change 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 inevitably difficult, but if you have the slightest doubt in the treatment of your injector that leaks on your BMW 7 Series, we suggest you to get closer to your auto mechanic to avoid any bad handling that could seriously harm the condition of your BMW 7 Series.

If you need more tutorials on the BMW 7 Series, go to our BMW 7 Series category.