In the event that you are alert of irregular symptoms on your automobile, you are right to be concerned, because a car represents a huge annual budget and unpredicted malfunctions don’t lower the bill. So what if you find that you have a leaking injector on your Mercury Mariner? You probably figured it out thanks to black/oily drips along your engine unit, or a troubled idle, or unconventional black smoke. These three manifestations are the main indicators of a leaking injector. As this failure can produce more significant engine problems on your car, we made a decision to produce this article to help you confirm the failure of a leaking injector and treat it properly. To achieve this, we will first look at the circumstance of gasoline injectors and then at those of diesel injectors Mercury Mariner.

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Leaking injector on my petrol Mercury Mariner

It is crucial to know that the injectors on petrol and diesel engines are different, the truth is, the difference in combustion between these two sort of engines makes the injection different. The essential 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 Mercury Mariner: The different leaks

It should be said that injector leaks on a Mercury Mariner equipped with a petrol engine are pretty infrequent. This is caused by the much lower pressure in the petrol intake systems. Nevertheless, there are two sort 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 component that is attached to the fuel rail, an O-ring will be involved in this.
  • Leak injector of the lower part:
    At last, you may encounter a leak coming from the lower portion of the injector of your car, this one will come from the junction with the engine and not with the rail as seen before.

Leaking injector on my diesel Mercury Mariner

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 Mercury Mariner: The different leaks

In the circumstance of leaking diesel injectors on your Mercury Mariner, there are three different sort of leaks:

  • Leakage from the injector inlet:
    In this case, it is an inlet pipe that will deform in the long run, usually the leak will be at the clamping point.
  • Injector return leakage:
    As its name indicates, this leakage relates to the management of the fuel return in the injector, this time the injector that leaks on your Mercury Mariner 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 find an air noise and a compression loss.
  • If after checking you have oil leaking but it does not come from your injectors, we recommend you to browse this article on the existence of oil leaking on your Mercury Mariner.

Leaking injector on my Mercury Mariner, how to fix the leak

And to finish, we’re going to look at how to fix a leaking injector on your car. Oftentimes a leak is linked, as we have seen prior to this, to a worn seal caused by the pressures endured. But think that the pressure in the circuit is monumental, especially on diesel engines. So you will have to take some precautions:

  • Lower the pressure before any work is carried out…
  • 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 regularly be restricted to swapping the seals that have failed:

  • Situate 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 respect with the manufacturer’s standards.

In all cases, these interventions are not inevitably complex, but if you have the tiniest doubt in the treatment of your injector that leaks on your Mercury Mariner, we recommend you to get closer to your auto technician to avoid any bad handling that could severely harm the condition of your Mercury Mariner.

If you have any further questions about the Mercury Mariner, do not hesitate to consult our Mercury Mariner category.